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21 results on '"Estelle Lebègue"'

1. Lipid Membrane Permeability of Synthetic Redox DMPC Liposomes Investigated by Single Electrochemical Collisions

Author

Allen J. Bard, Estelle Lebègue, Frédéric Barrière, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), University of Texas at Austin [Austin], CHE-1405248, Division of Chemistry, F-0021, Welch Foundation, Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Liposome, Chemistry, 010401 analytical chemistry, technology, industry, and agriculture, chemistry.chemical_element, Electrochemical detection, 010402 general chemistry, Electrochemistry, 01 natural sciences, Redox, 0104 chemical sciences, Analytical Chemistry, Chemical engineering, Permeability (electromagnetism), [CHIM]Chemical Sciences, lipids (amino acids, peptides, and proteins), Lipid bilayer, Carbon
Abstract

International audience; The electrochemical detection of synthetic redox DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) liposomes by single collisions at 10 μm diameter carbon and Pt ultramicroelectrodes (UMEs) is reported. To study the parameters influencing the lipid membrane opening/permeability, the electrochemical detection of single redox DMPC liposome collisions at polarized UMEs was investigated under different experimental conditions (addition of surfactant, temperature). The electrochemical responses recorded showed that the permeability of the DMPC lipid membrane (tuned by addition of Triton X-100 surfactant or by the increase of the solution temperature) is a key parameter for the liposome membrane electroporation process and hence for the release and oxidation of its redox content during the collision onto UMEs. The presence of ferrocenemethanol as an additional redox probe in the aqueous solution (at room temperature and without addition of surfactant) is also an interesting strategy to detect current spikes corresponding to single redox DMPC liposome collisions with KFe(CN)/KFe(CN) as the encapsulated aqueous redox probe.

Published
2020
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2. Redox active films of salicylic acid-based molecules as pH and ion sensors for monitoring ionophore activity in supported lipid deposits

Author

Thomas Flinois, Frédéric Barrière, Estelle Lebègue, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Agence Nationale de la Recherche ANR-15-CE05-0003, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and ANR-15-CE05-0003,bioWATTS,membranes biomimétiques qui produire de l'énergie biologiquement inspiré(2015)

Subjects
Nigericin, salicylic acid, General Chemical Engineering, Potassium, Sodium, Inorganic chemistry, chemistry.chemical_element, redox active films, 02 engineering and technology, ion sensors, Glassy carbon, 010402 general chemistry, 01 natural sciences, Chloride, ionophores, chemistry.chemical_compound, Valinomycin, valinomycin, Electrochemistry, medicine, [CHIM]Chemical Sciences, nigericin, 021001 nanoscience & nanotechnology, cyclic voltammetry, 0104 chemical sciences, lipid deposits, chemistry, pH sensors, electrodeposition, Cyclic voltammetry, 0210 nano-technology, Salicylic acid, medicine.drug
Abstract

International audience; *corresponding authors: frederic.barriere@univ-rennes1.fr and thomas.flinois@univ-rennes1.fr Abstract: 5-aminosalicylic acid and salicylic acid have been used to form redox active films onto glassy carbon electrodes through recurrent cyclic voltammetry. The variation of the formal potential of the film obtained from 5-aminosalicylic acid as a function of pH is linear over the entire pH range studied (pH 2 to 10) with a slope of-80 mV per pH unit. Salicylic acid-based redox active films permit the detection of sodium and potassium ions (with a slope of-10 mV per 1 mM of cation) and chloride (with a slope of +11 mV per 1 mM of chloride). A lipid deposit of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) onto these modified electrodes allowed the integration of ionophores (valinomycin and nigericin) and the monitoring of the pH and potassium ion concentration variation at the modified electrode / lipid deposit interface.

Published
2019
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3. Electrografted anthraquinone to monitor pH at the biofilm-anode interface in a wastewater microbial fuel cell

Author

Nazua L. Costa, Germaine Olorounto, Estelle Lebègue, Frédéric Barrière, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Région Bretagne is thanked for funding a postdoc position under the Stratégie d′Attractivité Durable Program 2016 (project 9621)., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, and Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)

Subjects
Cyclic voltammetry, Bioelectric Energy Sources, Anthraquinones, 02 engineering and technology, Surfaces and Interfaces, General Medicine, Hydrogen-Ion Concentration, Wastewater, Interfacial pH sensors, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 6. Clean water, 0104 chemical sciences, Aryldiazonium, Electricigen bacteria, Surface modification, Colloid and Surface Chemistry, Biofilms, [CHIM]Chemical Sciences, Physical and Theoretical Chemistry, 1-aminoanthraquinone, 0210 nano-technology, Electrodes, Biotechnology
Abstract

International audience; Electrografted anthraquinone on graphite was used as a probe to monitor the pH change at the biofilm-electrode interface at the anode of a microbial fuel cell inoculated with wastewater. The grafting procedure was optimized so that the pH-dependent electrochemical response of the grafted quinone did not overlay with that of the electroactive biofilm. The variation of the formal potential of the grafted quinone as a function of pH was linear over the pH range 1-10 with a slope of - 64 mV. This allowed to monitor the interfacial pH change over three weeks of biofilm colonization of the electrode. During that time the interfacial pH decreased from neutrality to 5.3 while the anolyte only acidified down to pH 6.2. This finding is relevant as local pH change usually leads to alterations of the bioenergetics process of microbial communities and hence on the performance of bioelectrochemical devices.

Published
2022
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4. Electrochemical properties of pH-dependent flavocytochrome c3 from Shewanella putrefaciens adsorbed onto unmodified and catechol-modified edge plane pyrolytic graphite electrode

Author

Nazua L. Costa, Ricardo O. Louro, Estelle Lebègue, Bruno M. Fonseca, Frédéric Barrière, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Universidade de Lisboa (ULISBOA), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), Estelle Lebègue is supported by a Marie Skłodowska Curie Individual Fellowship through funding from the European Union's Horizon 2020 research and innovation programme, grant agreement No 745689. Bruno Fonseca was funded by Fundação para a Ciência e a Tecnologia (SFRH/BPD/93164/2013). This work has received funding at Universidade Nova de Lisboa from the European Union's Horizon 2020 WIDESPREAD-Twinning research and innovation programme under grant agreement No 810856. This work was supported by Fundação para a Ciência e a Tecnologia (FCT) Portugal (PTDC/BBB-BQB/4178/2014, PTDC/BIA-BQM/30176/2017) and by Project LISBOA-01-0145-FEDER-007660 (Microbiologia Molecular, Estrutural e Celular) funded by FEDER funds through COMPETE2020 - Programa Operacional Competitividade e Internacionalização (POCI). The authors also thank the France-Portugal PHC PESSOA programme for support, project 40814ZE., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidade de Lisboa = University of Lisbon (ULISBOA), Molecular, Structural and Cellular Microbiology (MOSTMICRO), and Instituto de Tecnologia Química e Biológica António Xavier (ITQB)

Subjects
Cyclic voltammetry, General Chemical Engineering, Inorganic chemistry, 02 engineering and technology, Shewanella putrefaciens, Fumarate reductase, 010402 general chemistry, 01 natural sciences, Redox, Electrode surface modification, Shewanella frigidimarina, Analytical Chemistry, chemistry.chemical_compound, Catechol pH probe, pH-dependent redox activity, Electrochemistry, [CHIM]Chemical Sciences, Pyrolytic carbon, Shewanella oneidensis, Flavocytochrome c3, Catechol, biology, Chemistry, 021001 nanoscience & nanotechnology, biology.organism_classification, equipment and supplies, 0104 chemical sciences, Flavocytochrome c, Chemical Engineering(all), bacteria, 0210 nano-technology
Abstract

The electroactivity of adsorbed flavocytochrome c3, a tetraheme FAD-containing flavoenzyme isolated from the bacterium Shewanella putrefaciens, is investigated by cyclic voltammetry at an edge plane pyrolytic graphite electrode before and after modification with grafted catechol serving as an efficient pH sensor based on a redox readout. Flavocytochrome c3 adsorption onto the unmodified or modified electrode surface is successfully achieved by cyclic voltammetry (100 consecutive cycles) in a flavocytochrome c3 solution containing polymyxin as co-adsorbate. The immobilized flavocytochrome c3 retains its electrochemical activity and its catalytic fumarate reductase activity. The redox activity of the protein arises from its FAD and four hemes cofactors. The experiments evidence that the hemes' redox potential of flavocytochrome c3 from Shewanella putrefaciens, for which no crystal structure is yet available, depend on pH which is at variance with data from the other strains Shewanella frigidimarina or Shewanella oneidensis. authorsversion published

Published
2019
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5. Electrochemical Behavior of Pyridinium and N -Methyl Pyridinium Cations in Aqueous Electrolytes for CO2 Reduction

Author

Daniel Bélanger, Julia Agullo, and Estelle Lebègue

Subjects
Electrolysis, Aqueous solution, General Chemical Engineering, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, Glassy carbon, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, General Energy, chemistry, law, Pyridine, Environmental Chemistry, General Materials Science, Pyridinium, Methanol, 0210 nano-technology, Platinum
Abstract

The electrochemical reduction of aqueous pyridinium and N-methyl pyridinium ions is investigated in the absence and presence of CO2 and electrolysis reaction products on glassy carbon, Au, and Pt electrodes are studied. Unlike pyridinium, N-methyl pyridinium is not electroactive at the Pt electrode. The electrochemical reduction of the two pyridine derivatives was found to be irreversible on glassy carbon. These results confirmed the essential role of the N-H bond of the pyridinium cation. In contrast, the electrochemical response of N-methyl pyridinium ion at the glassy carbon electrode suggests that a specific interaction occurs between the glassy carbon surface and the aromatic ring of the pyridinium derivative. For all electrodes, an enhancement of current was observed in the presence of CO2 . However, NMR spectroscopy of the solutions following electrolysis showed no formation of methanol or other possible byproducts of the reduction of CO2 in the presence of either pyridinium derivative ion.

Published
2017
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6. Millisecond Coulometry via Zeptoliter Droplet Collisions on an Ultramicroelectrode

Author

Allen J. Bard, Lauren M. Strawsine, Estelle Lebègue, and Jeffrey E. Dick

Subjects
Electrolysis, Chemistry, Dispersity, Analytical chemistry, Ultramicroelectrode, 02 engineering and technology, Electron, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, Analytical Chemistry, law.invention, Coulometry, chemistry.chemical_compound, law, 0210 nano-technology, Stoichiometry, Tetrathiafulvalene
Abstract

We show that discrete collisions of zeptoliter emulsion droplets on an ultramicroelectrode (UME) can be used as individual controlled potential coulometry experiments, lasting between 100 and 500 milliseconds. By loading a highly hydrophobic toluene droplet with a hydrophobic analyte of interest and knowing the volume of the droplet to a high degree of precision, Faraday’s Law can be employed to calculate the number of electrons passed during the electrolysis. Monodisperse (±15 % of the average size) emulsion systems were created by ultrasonication followed by filtering through a 200 nm porous filter. Discrete droplet collision events were observed in the amperometric i-t curve. Each of these collisions are interpreted as individual coulometry experiments, implying that several bulk electrolyses can be carried out over the course of one collision experiment. Herein, we show calculations of the electron stoichiometry for the ferrocene oxidation reaction, which agrees well with the expected value of 1 electron. We further extend the methodology to more complicated systems, such as the oxidation of tetrathiafulvalene (TTF), tertiary aliphatic amines, such as tripropylamine (TPrA), and a 1,2-diphenylhydrazine (DPH) molecule. This electroanalytical methodology allows for fast, nanoscale electrolysis in low dielectric media.

Published
2016
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7. Biomimetic vesicles for electrochemical sensing

Author

Carole Chaix, Carole Farre, Yves Chevalier, Catherine Jose, Estelle Lebègue, Florence Lagarde, Nicole Jaffrezic-Renault, Joëlle Saulnier, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Interfaces & biosensors - Interfaces & biocapteurs, Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), SIMS - Surfaces-(bio)Interfaces - Micro & Nano Systèmes (2011-2014), Laboratoire d'automatique et de génie des procédés (LAGEP), Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), Sciences Analytiques (SA), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Laboratoire d'automatique, de génie des procédés et de génie pharmaceutique (LAGEPP), EC, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Vesicle, 010401 analytical chemistry, Nanotechnology, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Key issues, 01 natural sciences, 0104 chemical sciences, Analytical Chemistry, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Membrane, [CHIM.POLY]Chemical Sciences/Polymers, [SDV.SP.PG]Life Sciences [q-bio]/Pharmaceutical sciences/Galenic pharmacology, Microfluidic chip, Electrochemistry, Electrochemical biosensor, 0210 nano-technology, Biosensor, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; Biomimetic vesicles, mainly composed of self-assembled bilayers of phospholipids, have attracted great attention for applications in the biosensor field over a number of decades, as a means to amplify the signal through encapsulated signal probes. In this review paper the most important developments in biomimetic vesicles for electrochemical biosensing within the last 2 years are presented, with a focus on the format of bioassays, their inclusion in microfluidic chip devices and their use in mimicking cell membranes. Key issues and the remaining challenges for future commercialization are analyzed.

Published
2018
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8. Electrochemical Detection of pH-Responsive Grafted Catechol and Immobilized Cytochrome c onto Lipid Deposit-Modified Glassy Carbon Surface

Author

Ricardo O. Louro, Frédéric Barrière, Estelle Lebègue, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), 745689, H2020 Marie Skłodowska-Curie Actions, 40814ZE, Ministère de l'Education Nationale, de l'Enseignement Superieur et de la Recherche, 40814ZE, Minist?re de l?Europe et des Affaires ?trang?res, 40814ZE, FCT - Funda??o para a Ci?ncia e a Tecnologia, Bioresources 4 Sustainability (GREEN-IT), Molecular, Structural and Cellular Microbiology (MOSTMICRO), Instituto de Tecnologia Química e Biológica António Xavier (ITQB), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
Chemistry(all), General Chemical Engineering, 02 engineering and technology, Glassy carbon, Electrochemistry, 01 natural sciences, Redox, Article, chemistry.chemical_compound, [CHIM]Chemical Sciences, Catechol, biology, 010405 organic chemistry, Chemistry, Cytochrome c, General Chemistry, 021001 nanoscience & nanotechnology, Grafting, 0104 chemical sciences, Covalent bond, biology.protein, Chemical Engineering(all), lipids (amino acids, peptides, and proteins), Cyclic voltammetry, 0210 nano-technology, Nuclear chemistry
Abstract

International audience; The electrochemical systems of both grafted catechol as a pH-responsive electrophore and immobilized cytochrome c as a model redox protein are detected by cyclic voltammetry at an optimized lipid deposit-modified glassy carbon electrode. The catechol covalent grafting is successfully performed by the one-pot/three-step electrochemical reduction of 3,4-dihydroxybenzenediazonium salts generated in situ from 4-nitrocatechol. The resulting glassy carbon electrode electrochemically modified by grafted catechol species is evaluated as an efficient electrochemical pH sensor. The optimized molar ratio for the lipid deposit, promoting cytochrome c electrochemical activity in solution onto glassy carbon electrode, is reached for the lipid mixture composed of 75% 1,2-dioleoyl-sn-glycero-3-phosphocholine and 25% cardiolipin. Cytochrome c immobilization into the optimized supported lipid deposit is efficiently achieved by cyclic voltammetry (10 cycles) recorded at the modified glassy carbon electrode in a cytochrome c solution. The pH-dependent redox response of the grafted catechol and that of the immobilized cytochrome c are finally detected at the same lipid-modified glassy carbon electrode without alteration of their structure and electrochemical properties in the pH range 5-9. © 2018 American Chemical Society.

Published
2018
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9. Responsive Polydiacetylene Vesicles for Biosensing Microorganisms

Author

Estelle Lebègue, Carole Farre, Yves Chevalier, Nicole Jaffrezic-Renault, Joëlle Saulnier, Carole Chaix, Florence Lagarde, Catherine Jose, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Interfaces & biosensors - Interfaces & biocapteurs, Institut des Sciences Analytiques (ISA), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'automatique, de génie des procédés et de génie pharmaceutique (LAGEPP), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), EC, European Commission through a Marie Skłodowska Curie Individual Fellowship, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), SIMS - Surfaces-(bio)Interfaces - Micro & Nano Systèmes (2011-2014), Laboratoire d'automatique et de génie des procédés (LAGEP), and Sciences Analytiques (SA)

Subjects
analytical_chemistry, Polymers, Microorganism, Review, Biosensing Techniques, 02 engineering and technology, lcsh:Chemical technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Analytical Chemistry, chemistry.chemical_compound, Toxins, lcsh:TP1-1185, Vesicles, Electrical and Electronic Engineering, Instrumentation, ComputingMilieux_MISCELLANEOUS, biology, Bacteria, Biosensing, Vesicle, Polyynes, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, biology.organism_classification, Fluorescence, Polyacetylene Polymer, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Virus, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.POLY]Chemical Sciences/Polymers, [SDV.SP.PG]Life Sciences [q-bio]/Pharmaceutical sciences/Galenic pharmacology, chemistry, Biophysics, Colorimetry, Polydiacetylene, 0210 nano-technology, Peptides, Biosensor, DNA
Abstract

International audience; Polydiacetylene (PDA) inserted in films or in vesicles has received increasing attention due to its property to undergo a blue-to-red colorimetric transition along with a change from non-fluorescent to fluorescent upon application of various stimuli. In this review paper, the principle for the detection of various microorganisms (bacteria, directly detected or detected through the emitted toxins or through their DNA, and viruses) and of antibacterial and antiviral peptides based on these responsive PDA vesicles are detailed. The analytical performances obtained, when vesicles are in suspension or immobilized, are given and compared to those of the responsive vesicles mainly based on the vesicle encapsulation method. Many future challenges are then discussed

Published
2018
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10. An optimal surface concentration of pure cardiolipin deposited onto glassy carbon electrode promoting the direct electron transfer of cytochrome-c

Author

Thomas Flinois, Corinne Lagrost, Frédéric Barrière, Estelle Lebègue, Hassiba Smida, Véronique Vié, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), 15-CE05-0003, ANR, Agence Nationale de la Recherche, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), and ANR-15-CE05-0003,bioWATTS,membranes biomimétiques qui produire de l'énergie biologiquement inspiré(2015)

Subjects
Cyclic voltammetry, Supported lipid deposit, General Chemical Engineering, 02 engineering and technology, Glassy carbon, 010402 general chemistry, Electrochemistry, 01 natural sciences, Redox, Analytical Chemistry, chemistry.chemical_compound, Atomic force microscopy, Monolayer, [CHIM]Chemical Sciences, [PHYS]Physics [physics], Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, Chemical engineering, Electrode, Cardiolipin, lipids (amino acids, peptides, and proteins), Cytochrome-c, Ferrocyanide, 0210 nano-technology, Electrochemical impedance spectroscopy
Abstract

International audience; Pure cardiolipin deposit onto electrodes is optimized and shown to yield an efficient supported lipid film for promoting cytochrome-c immobilization and electroactivity. Cyclic voltammetry and electrochemical impedance spectroscopy measurements in an aqueous electrolyte with potassium ferri- and ferrocyanide as a redox probe evidence that an optimized pure cardiolipin film is reached for a 7 μg cm− 2 deposit onto glassy carbon electrode. At this optimized surface concentration the pure cardiolipin deposit yields the most compact and less permeable supported lipid film on electrode surface. The thickness and the organization of the pure cardiolipin films were analyzed by atomic force microscopy (AFM) measurements. AFM imaging in aqueous buffer shows that the lipid deposit onto the surface forms a thick deposit of approximately 30 ± 10 nm of height with 4 nm average roughness and includes defects. Cytochrome-c electroactivity was studied with the redox protein either in solution or immobilized onto the modified electrode. First, the optimized amount of pure cardiolipin was deposited onto glassy carbon electrodes to study the stable and electrochemically quasi-reversible redox system of cytochrome-c in solution. Then, the potential cycling of a pure cardiolipin-modified glassy carbon electrode in a cytochrome-c solution led to the immobilization of the protein in its native state keeping intact its electrochemical properties, and with a surface coverage of 8 pmol cm− 2 corresponding to 50% of a monolayer.

Published
2018
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11. Effect of the Porous Texture of Activated Carbons on the Electrochemical Properties of Molecule-Grafted Carbon Products in Organic Media

Author

Estelle Lebègue, Charles Cougnon, Joël Gaubicher, Thierry Brousse, Corentin Benoit, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité de chimie organique moléculaire et macromoléculaire (UCO2M), and Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Renewable Energy, Sustainability and the Environment, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electrochemistry, 01 natural sciences, Organic media, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Chemical engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Materials Chemistry, Molecule, Texture (crystalline), 0210 nano-technology, Porosity, Carbon, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
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12. Reductive electrografting of in situ produced diazopyridinium cations: Tailoring the interface between carbon electrodes and electroactive bacterial films

Author

Frédéric Barrière, Hassiba Smida, Corinne Lagrost, Estelle Lebègue, Jean-François Bergamini, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), H·Smida thanks the French Ministry of Research for her grant. E. Lebègue thanks the EU Marie Skłodowska Curie Individual Fellowship action for financial support., Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Microbial fuel cell, Materials science, Bioelectric Energy Sources, Surface Properties, Biophysics, chemistry.chemical_element, Pyridinium Compounds, 02 engineering and technology, 010402 general chemistry, Electrochemistry, 01 natural sciences, Contact angle, Electron Transport, X-ray photoelectron spectroscopy, Cations, Physical and Theoretical Chemistry, 4-Aminopyridine, Electrodes, Electrochemical grafting, Biofilm, Microbial fuel cells, General Medicine, Equipment Design, 021001 nanoscience & nanotechnology, Electroplating, Carbon, 0104 chemical sciences, Anode, Chemical engineering, chemistry, Diazopyridinium, Surface functionalization, Biofilms, Electrode, Surface modification, Graphite, [CHIM.OTHE]Chemical Sciences/Other, 0210 nano-technology, Oxidation-Reduction
Abstract

International audience; Carbon electrodes were functionalized through the reduction of diazopyridinium cations that are produced from in situ diazotization of 2-, 3- and 4-aminopyridine. Diazopyridinium salts were much more rarely employed for surface functionalization than other aryldiazonium derivatives. A study combining X-ray Photoelectron Spectroscopy (XPS), contact angle, ellipsometry, Atomic Force Microscopy (AFM) measurements and electrochemical analyses demonstrates that films obtained from 4-diazopyridinium cations are hydrophilic, dense, compact but sufficiently thin to preserve fast electronic transfer rate, being then relevant to efficiently tailor the interface between the anode surface and an electroactive biofilm. Microbial Fuels Cells (MFCs) with pyridine-functionalized graphite anodes exhibit faster development and improved performances than MFCs operating with bare graphite anodes.

Published
2017
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13. Preparation of a tetrahydroxyphenazine-modified carbon as cathode material for supercapacitor in aqueous acid electrolyte

Author

Charles Cougnon, Stéphanie Legoupy, Estelle Lebègue, MOLTECH-Anjou, Université d'Angers (UA)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS), MOLTECH-ANJOU (MOLTECH-ANJOU), Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), and Université de Nantes (UN)-Université de Nantes (UN)

Subjects
Materials science, Rhodizonic acid, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, lcsh:Chemistry, chemistry.chemical_compound, Electrochemistry, medicine, Specific energy, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, Supercapacitor, Aqueous solution, 021001 nanoscience & nanotechnology, Condensation reaction, 0104 chemical sciences, chemistry, lcsh:Industrial electrochemistry, lcsh:QD1-999, Oxocarbon, 0210 nano-technology, Carbon, Activated carbon, medicine.drug, lcsh:TP250-261
Abstract

A procedure for the grafting of oxocarbon compounds is proposed by condensation reaction with a benzenediamine to obtain an attached-phenazine moieties. A technical proof of concept is given by the covalent capture of rhodizonic acid on the Norit activated carbon and potentiality for supercapacitors is evidenced. The composite material obtained was tested as positive electrode for aqueous supercapacitors in 1 M H2SO4. The redox activity covering a wide range of potential gives an unprecedented increase in specific charge of 350% and a specific energy at the discharge 3.4 times higher than the unmodified carbon. Keywords: Supercapacitor, Activated carbon, Diazonium salt, Oxocarbons, Grafting

Published
2016
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14. Direct introduction of redox centers at activated carbon substrate based on acid-substituent-assisted diazotization

Author

Estelle Lebègue, Joël Gaubicher, Olivier Crosnier, Thierry Brousse, Charles Cougnon, MOLTECH-Anjou, and Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Carboxylic acid, Inorganic chemistry, Substituent, 02 engineering and technology, 010402 general chemistry, Photochemistry, 01 natural sciences, Redox, lcsh:Chemistry, chemistry.chemical_compound, Electrochemistry, medicine, [CHIM]Chemical Sciences, chemistry.chemical_classification, Substrate (chemistry), Chemical modification, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, lcsh:Industrial electrochemistry, lcsh:QD1-999, Yield (chemistry), Cyclic voltammetry, 0210 nano-technology, Activated carbon, medicine.drug, lcsh:TP250-261
Abstract

Redox properties have been imparted to activated carbon with a high degree of functionalization by chemical grafting of 2-amino-4,5-dimethoxybenzoic acid in situ diazotized. The diazotization reaction was accomplished in the presence or in the absence of HCl for estimating the positive or negative effect of the carboxylic acid substituent on the grafting yield. Thermal gravimetric analysis, X-ray photoelectron spectroscopy and cyclic voltammetry experiments show that when the carboxylic acid group participates to the diazotization reaction, the grafting yield is improved and becomes even better than when the carboxylic group is not present, increasing the capacitance of pristine carbon electrode from 120 to 200 F/g. Keywords: Activated carbon, Diazonium salt, Catechol, Chemical grafting, Supercapacitor

Published
2012
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15. Corrigendum to 'Reductive electrografting of in situ produced diazopyridinium cations: Tailoring the interface between carbon electrodes and electroactive bacterial films' [Bioelectrochem. 120 (2018) 157–165]

Author

Estelle Lebègue, M. Cortés, Corinne Lagrost, Frédéric Barrière, Hassiba Smida, and Jean-François Bergamini

Subjects
In situ, Materials science, 010304 chemical physics, 020209 energy, Interface (computing), Biophysics, chemistry.chemical_element, 02 engineering and technology, General Medicine, 01 natural sciences, chemistry, Chemical engineering, 0103 physical sciences, Electrode, 0202 electrical engineering, electronic engineering, information engineering, Electrochemistry, Physical and Theoretical Chemistry, Carbon
Published
2019
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16. Polyol synthesis of nanosized Pt/C electrocatalysts assisted by pulse microwave activation

Author

Estelle Lebègue, Stève Baranton, Christophe Coutanceau, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), and Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Stripping (chemistry), Analytical chemistry, Energy Engineering and Power Technology, Nanoparticle, Proton exchange membrane fuel cell, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Catalysis, Taguchi methods, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Platinum, Renewable Energy, Sustainability and the Environment, Fuel cell, Electrocatalysts, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Chemical engineering, chemistry, Polyol, Nanoparticles, Cyclic voltammetry, 0210 nano-technology, Microwave
Abstract

International audience; A polyol process assisted by pulse microwave activation was used to prepare efficient Pt/C electrocatalysts for PEMFC applications with reducing cost. Catalysts from pulsed microwave method were compared with a catalyst issued from a classical method, in terms of active surface area, platinum loading and activity towards the oxygen reduction reaction. A design of experiments (DOE derived from the Taguchi method) has been implemented to optimize experimental parameters only related to pulse microwave activation, the intrinsic synthesis parameters (concentration of platinum salt, platinum/carbon weight ratio and pH) being kept constant. Controlled parameters were duration of microwave pulse, maximum temperature and total duration of the synthesis. Considered responses were catalyst active surface area and the Pt/C loading. An optimized configuration of synthesis parameter was proposed. The confirmation experiment revealed a trend in agreement with that expected. Three catalysts (two from pulsed microwave synthesis method and one prepared by the classical method) were characterized by transmission electron microscopy, cyclic voltammetry and CO stripping. Catalysts from pulsed microwave method display higher characteristics than the one prepared by the classical method. The Pt/C catalyst from the confirmation experiment displays the highest catalytic activity toward oxygen reduction reaction.

Published
2011
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17. Electrochemical Detection of Single Phospholipid Vesicle Collisions at a Pt Ultramicroelectrode

Author

Jeffrey E. Dick, Allen J. Bard, Cari M. Anderson, Lauren J. Webb, Estelle Lebègue, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
Chemistry, Bilayer, Vesicle, Inorganic chemistry, Ultramicroelectrode, 02 engineering and technology, Surfaces and Interfaces, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Redox, Amperometry, 0104 chemical sciences, chemistry.chemical_compound, Microelectrode, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Electrochemistry, General Materials Science, Ferrocyanide, 0210 nano-technology, Lipid bilayer, Microelectrodes, Phospholipids, Spectroscopy
Abstract

We report the collision behavior of single unilamellar vesicles, composed of a bilayer lipid membrane (BLM), on a platinum (Pt) ultramicroelectrode (UME) by two electrochemical detection methods. In the first method, the blocking of a solution redox reaction, induced by the single vesicle adsorption on the Pt UME, can be observed in the amperometric i-t response as current steps during the electrochemical oxidation of ferrocyanide. In the second technique, the ferrocyanide redox probe is directly encapsulated inside vesicles and can be oxidized during the vesicle collision on the UME if the potential is poised positive enough for ferrocyanide oxidation to occur. In the amperometric i-t response for the latter experiment, a current spike is observed. Here, we report the vesicle blocking (VB) method as a relevant technique for determining the vesicle solution concentration from the collisional frequency and also for observing the vesicle adhesion on the Pt surface. In addition, vesicle reactor (VR) experiments show clear evidence that the lipid bilayer membrane does not collapse or break open at the Pt UME during the vesicle collision. Because the bilayer is too thick for electron tunneling to occur readily, an appropriate concentration of a surfactant, such as Triton X-100 (TX100), was added in the VR solution to induce loosening of the bilayer (transfection conditions), allowing the electrode to oxidize the contents of the vesicle. With this technique, the TX100 effect on the vesicle lipid bilayer permeability can be evaluated through the current spike charge and frequency corresponding to redox vesicle collisions.

Published
2015
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18. Impedance spectroscopy study of a catechol-modified activated carbon electrode as active material in electrochemical capacitor

Author

G. Pognon, Estelle Lebègue, Charles Cougnon, MOLTECH-Anjou, and Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Differential capacitance, Activated carbon, Analytical chemistry, Energy Engineering and Power Technology, chemistry.chemical_element, Diazonium salt, 02 engineering and technology, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Reference electrode, Capacitance, [CHIM]Chemical Sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Electrochemical capacitor, Grafting, Renewable Energy, Sustainability and the Environment, Impedance, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, chemistry, Electrode, Cyclic voltammetry, 0210 nano-technology, Carbon, Electrode potential
Abstract

International audience; Modified activated carbon (Norit S-50) electrodes with electrochemical double layer (EDL) capacitance and redox capacitance contributions to the electric charge storage were tested in 1M H2SO4 to quantify the benefit and the limitation of the surface redox reactions on the electrochemical performances of the resulting pseudo-capacitive materials. The electrochemical performances of an electrochemically anodized carbon electrode and a catechol-modified carbon electrode, which make use both EDL capacitance of the porous structure of the carbon and redox capacitance, were compared to the performances obtained for the pristine carbon. Nitrogen gas adsorption measurements have been used for studying the impact of the grafting on the BET surface area, pore size distribution, pore volume and average pore diameter.The electrochemical behavior of carbon materials was studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The EIS data were discussed by using a complex capacitance model that allows defining the characteristic time constant, the global capacitance and the frequency at which the maximum charge stored is reached. The EIS measurements were achieved at different dc potential values where a redox activity occurs and the evolution of the capacitance and the capacitive relaxation time with the electrode potential are presented. Realistic galvanostatic charge/discharge measurements performed at different current rates corroborate the results obtained by impedance.

Published
2015
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19. Toward fully organic rechargeable charge storage devices based on carbon electrodes grafted with redox molecules

Author

Joël Gaubicher, Richard Retoux, Charles Cougnon, Estelle Lebègue, Thierry Brousse, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, Electrolyte, 010402 general chemistry, Electrochemistry, 01 natural sciences, 7. Clean energy, Redox, Capacitance, chemistry.chemical_compound, medicine, [CHIM]Chemical Sciences, General Materials Science, ComputingMilieux_MISCELLANEOUS, Renewable Energy, Sustainability and the Environment, [CHIM.ORGA]Chemical Sciences/Organic chemistry, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Propylene carbonate, Electrode, 0210 nano-technology, Carbon, Activated carbon, medicine.drug
Abstract

International audience; Activated carbon powders modified with naphthalimide and 2,2,6,6-tetramethylpiperidine-N-oxyl were assembled into a hybrid electrochemical capacitor containing an organic electrolyte. The fully organic rechargeable system demonstrated an increase in specific capacitance up to 51%, an extended operating voltage of 2.9 V in propylene carbonate, compared to 1.9 V for the unmodified system, and a power 2.5 times higher.

Published
2014
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20. Chemical functionalization of activated carbon through radical and diradical intermediates

Author

Thierry Brousse, Charles Cougnon, Estelle Lebègue, Joël Gaubicher, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), MOLTECH-Anjou, and Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Benzynes, Activated carbon, Reactive intermediate, chemistry.chemical_element, 02 engineering and technology, Reaction intermediate, Capacitors, Photochemistry, 01 natural sciences, Redox, lcsh:Chemistry, medicine, Electrochemistry, Ether cleavage, Grafting, 010405 organic chemistry, Diradical, 021001 nanoscience & nanotechnology, Diazonium salts, 0104 chemical sciences, lcsh:Industrial electrochemistry, lcsh:QD1-999, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Cyclic voltammetry, 0210 nano-technology, Carbon, lcsh:TP250-261, medicine.drug
Abstract

Small redox molecules were grafted on carbon through radical and diradical procedures. The reactive intermediates were derived from the 3,4-dimethoxybenzenediazonium salt and the 4,5-dimethoxybenzenediazonium-2-carboxylate salt prepared and decomposed in situ, yielding the dimethoxybenzene radical and the analogous diradical benzyne, respectively. In both cases, the activated carbon Norit serves as trapping agent and the dimethoxybenzene–carbon composites obtained were compared by thermal gravimetric analysis, X-ray photoelectron spectroscopy and cyclic voltammetry. After oxidative ether cleavage of dimethoxybenzene molecules attached to the surface, the resultant catechol-modified carbon electrodes served as pseudo-capacitive materials in aqueous electrochemical capacitors. Keywords: Diazonium salts, Benzynes, Electrochemistry, Activated carbon, Capacitors, Grafting

Published
2013
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21. Modification of activated carbons based on diazonium ions in situ produced from aminobenzene organic acid without addition of other acid

Author

Thierry Brousse, Charles Cougnon, Lénaïc Madec, Eric Levillain, Estelle Lebègue, Joël Gaubicher, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Laboratoire de Génie des Matériaux et Procédés Associés (LGMPA), Ecole Polytechnique de l'Université de Nantes (EPUN), Chimie, Ingénierie Moléculaire et Matériaux d'Angers (CIMMA), Université d'Angers (UA)-Centre National de la Recherche Scientifique (CNRS), Unité de chimie organique moléculaire et macromoléculaire (UCO2M), and Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
chemistry.chemical_classification, Substituent, 02 engineering and technology, General Chemistry, Sulfonic acid, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Yield (chemistry), Materials Chemistry, medicine, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Organic chemistry, Amine gas treating, Triazene, 0210 nano-technology, Benzene, Activated carbon, medicine.drug, Organic acid
Abstract

International audience; Activated carbon products modified with a benzene sulfonic acid group were prepared based on the spontaneous reduction of diazonium salts in situ generated in water without addition of an external acid. The diazotization reaction assisted by the organic acid substituent, produced at once amine, diazonium and triazene functionalities that maximize the grafting yield by a chemical cooperation effect.

Published
2011
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