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3 results on '"Baptiste Polteau"'

1. MgF2-Based Organized Porous Inorganic Nanofluorides as Heterogeneous Catalysts for Fluorination of 2-Chloropyridine

Author

Sandrine Arrii, Annie Hemon‐Ribaud, Amandine Guiet, Veyis Gunes, Sylvette Brunet, Baptiste Polteau, Jérôme Lhoste, Sagrario Pascual, Vincent Maisonneuve, Monique Body, Yawen Wang, Valentine Camus-Génot, Cyrille Galven, Christophe Legein, Zahra Gohari-Bajestani, Jean Dominique Comparot, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), and Université de Poitiers-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Nanoparticle, HF gas fluorination, 02 engineering and technology, Thermal treatment, 010402 general chemistry, Heterogeneous catalysis, 01 natural sciences, law.invention, 2-chloropyridine, law, Specific surface area, General Materials Science, Calcination, Thermal stability, magnesium fluoride, [CHIM.ORGA]Chemical Sciences/Organic chemistry, heterogeneous catalyst, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, polymer template, Chemical engineering, organized porous inorganic fluorides (OPIFs), nanoparticles, Crystallite, 0210 nano-technology, Mesoporous material
Abstract

International audience; The successful preparation of organized porous inorganic fluorides (OPIFs) with a high specific surface area is demonstrated for MgF 2. For the first time, macroporous MgF 2 OPIFs with a surface area of above 200 m 2 g −1 and mesoporous MgF 2 powder were prepared through the assembly of preformed MgF 2 nanoparticles and homemade polymer templates with a tunable size. These OPIF materials have been fully examined at different synthesis stages by means of powder X-ray diffraction, N 2 sorption, scanning electron microscopy, and transmission electron microscopy analyses and 19 F and 1 H solid-state nuclear magnetic resonance. The relation between the nature, the size, and the amount of polymer template on the porous structure was deeply investigated. The MgF 2 OPIFs present a higher thermal stability under air and F 2 calcination than MgF 2 NPs as the structuration of the OPIF composite considerably slows down the crystallite growth during thermal treatment under air. OPIF materials were evaluated for the first time as heterogeneous catalysts for the fluorination of 2-chloropyridine under HF gas as a fluorinating agent at 350°C. This study evidences catalytic sites with two Lewis acidity strengths (medium and low).

Published
2021

2. Experimental and theoretical evidences of p-type conductivity in nickel carbodiimide nanoparticles with a delafossite structure type

Author

Yoann Farré, Franck Tessier, Stéphane Jobic, Camille Latouche, Fabrice Odobel, Tengfei Jiang, Mohammed Boujtita, Laurent Cario, Baptiste Polteau, François Cheviré, Yann Pellegrin, 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), School of Chemistry and Chemical Engineering, Yangzhou University, 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 (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), ANR-12-PRGE-0016-01, Agence Nationale de la Recherche, Centre National de la Recherche Scientifique, Université de Rennes 1, 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 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-12-PRGE-0016,POSITIF,Cellules solaires à colorant par sensibilisation d'oxydes semi-conducteurs de type p pour la fabrication de cellules tandem(2012)

Subjects
Chemistry, Rietveld refinement, Non-blocking I/O, chemistry.chemical_element, Mineralogy, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, engineering.material, Conductivity, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Dielectric spectroscopy, Inorganic Chemistry, Nickel, Delafossite, Specific surface area, engineering, Physical chemistry, Physical and Theoretical Chemistry, 0210 nano-technology, Electronic band structure
Abstract

International audience; Nickel carbodiimide (NiCN) was synthesized using a two-step precipitation-decomposition route leading to a brown powder with gypsum-flower-like morphology and a large specific surface area (75 m/g). This layered material crystallizes in the 2H structure type of delafossite (space group P6/mmc), which is built upon infinite /[NiN] layers connected by linear carbodiimide ([N═C═N]) bridges. An X-ray diffraction Rietveld refinement and thermal analyses pointed out some nickel deficiencies in the material, and band structure calculations carried out on the defect compound predicted p-type conductivity in relation to a slight amount of N. This p-type conductivity was demonstrated by electrochemical impedance spectroscopy measurements, and a flat band potential of 0.90 V vs SCE at pH 9.4 was measured. This value, which is more positive than those of CuGaO and CuCrO delafossite oxides and NiO, prompted us to test NiCN nanoparticles as a photocathode in p-type dye-sensitized solar cells.

Published
2017

3. Synthesis of Ni-poor NiO nanoparticles for p-DSSC applications

Author

Fabrice Odobel, François Cheviré, Stéphane Jobic, Laurent Cario, Baptiste Polteau, Franck Tessier, 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), Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), 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 Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), and Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Inorganic chemistry, Nanoparticle, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Photocathode, [SPI.MAT]Engineering Sciences [physics]/Materials, Synthesis, [CHIM]Chemical Sciences, General Materials Science, Nickel oxide, Non-blocking I/O, Thermal decomposition, General Chemistry, Nitrogen doping, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Magnetic susceptibility, 0104 chemical sciences, Dye-sensitized solar cell, Nickel, chemistry, Nanoparticles, 0210 nano-technology, Ni-poor NiO
Abstract

To improve the performances of p-Dye Sensitized Solar Cell (p-DSSC) for the future, the synthesis of modified p-type nickel oxide semiconductor, commonly used as photocathode in such devices, was initiated with Ni 3 O 2 (OH) 4 as precursor. This specific nickel oxyhydroxide was first characterized by X-ray photo-electron spectroscopy and magnetic susceptibility measurements. Then its thermal decomposition was thoroughly studied in order to control the particles size of the as-prepared NiO nanopowders. Low temperature decomposition in air of this precursor allows the formation of Ni 1−x O nanoparticles with a large amount of Ni vacancies and specific surface areas up to 250 m 2 g −1 . Its ammonolysis at 250 °C leads to nanostructured N-doped NiO (NiO:N) materials.

Published
2016

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