10 results on '"Debora Ressnig"'
Search Results
2. Ultrafast Syntheses of Silver Foams from Ag2NCN: Combustion Synthesis versus Chemical Reduction
- Author
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Markus Antonietti and Debora Ressnig
- Subjects
Materials science ,Chemical engineering ,General Chemical Engineering ,Inorganic chemistry ,Materials Chemistry ,Chemical reduction ,General Chemistry ,Combustion ,Ultrashort pulse - Published
- 2014
3. Dye-Mediated Growth of 2D Coppercarbodiimide (CuNCN) Nanostructures and their Metamorphosis into a 3D Cu@CxNyHybrid
- Author
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Debora Ressnig, Guylhaine Clavel, Markus Antonietti, and Nico Scharnagl
- Subjects
Materials science ,Nanostructure ,Chemical engineering ,media_common.quotation_subject ,Inorganic chemistry ,General Materials Science ,General Chemistry ,Metamorphosis ,Condensed Matter Physics ,Heterogeneous catalysis ,media_common - Published
- 2014
4. Sponge-like Nickel and Nickel Nitride Structures for Catalytic Applications
- Author
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Valerio Molinari, Guylhaine Clavel, Markus Antonietti, Debora Ressnig, Menny Shalom, Davide Esposito, and Cristina Giordano
- Subjects
chemistry.chemical_classification ,Materials science ,Mechanical Engineering ,Inorganic chemistry ,Graphitic carbon nitride ,Salt (chemistry) ,Nanoparticle ,chemistry.chemical_element ,Nitride ,Catalysis ,Metal ,chemistry.chemical_compound ,Nickel ,chemistry ,Chemical engineering ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,General Materials Science ,Carbon - Abstract
A safe and simple method to fabricate air-stable nickel nitride and nickel embedded in carbon and nitrogen matrix, with high surface area for catalytic applications, is presented. The new synthesis employs molten inorganic salts as the reaction media. The use of salt melt opens new possibilities for safe, simple, and cheap synthesis of metal nitrides and metals for energy-related applications.
- Published
- 2013
5. An expeditious synthesis of early transition metal carbide nanoparticles on graphitic carbons
- Author
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Simona Moldovan, David Portehault, Debora Ressnig, Clément Sanchez, Patricia Beaunier, Ovidiu Ersen, Sophie Carenco, Chaire Chimie des matériaux hybrides, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Laboratoire de Réactivité de Surface (LRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux Hybrides et Nanomatériaux (MHN), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,chemistry.chemical_element ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,Carbide ,Metal ,Transition metal ,Materials Chemistry ,Nanocomposite ,Metals and Alloys ,General Chemistry ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,visual_art ,Ceramics and Composites ,visual_art.visual_art_medium ,0210 nano-technology ,Carbon - Abstract
International audience; An expeditious synthesis of metal carbide nanoparticles onto various carbon supports is demonstrated. The procedure is versatile and readily yields TiC, VC, Mo2C and W2C nanoparticles on different types of carbons. The reaction is initiated at room temperature and proceeds within seconds. This novel synthetic route paves the way for a large variety of metal carbide–carbon nanocomposites that may be implemented in emerging nanotechnology fields.
- Published
- 2016
6. Photochemical and electrocatalytic water oxidation activity of cobalt carbodiimide
- Author
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Greta R. Patzke, Menny Shalom, Debora Ressnig, Fabio Evangelisti, Jörg Patscheider, Markus Antonietti, René Moré, University of Zurich, and Ressnig, Debora
- Subjects
10120 Department of Chemistry ,Materials science ,Inorganic chemistry ,Oxide ,chemistry.chemical_element ,2105 Renewable Energy, Sustainability and the Environment ,1600 General Chemistry ,02 engineering and technology ,010402 general chemistry ,Photochemistry ,7. Clean energy ,01 natural sciences ,law.invention ,Catalysis ,chemistry.chemical_compound ,law ,540 Chemistry ,General Materials Science ,Cobalt oxide ,Carbodiimide ,Electrolysis ,Renewable Energy, Sustainability and the Environment ,Oxygen evolution ,General Chemistry ,021001 nanoscience & nanotechnology ,2500 General Materials Science ,0104 chemical sciences ,chemistry ,Catalytic oxidation ,0210 nano-technology ,Cobalt - Abstract
Cobalt carbodiimide is introduced as a heterogeneous non-oxidic water oxidation catalyst prototype with dual photochemical and electrocatalytic activity in neutral and basic media. CoNCN exhibits higher initial turnover frequencies of (TOF/SBET: 2.1 × 10−1) for visible-light-driven oxygen evolution than cobalt oxide catalysts (TOF/SBET: 3.5 × 10−3) and a 18% higher oxygen yield (Ru-dye sensitized standard setup). Furthermore, CoNCN maintains stable current densities in electrolysis over 20 h, and structural tuning through cationic substitution revealed that mixed (Co, Ni)NCN catalysts with low Ni contents display higher current densities than pristine CoNCN. A wide range of bulk (XAFS/EXAFS, XRD, FTIR) and surface (XPS, EELS, HRTEM) analytical methods together with catalytic parameter variations and reference experiments were performed to confirm the stability of CoNCN under standard operational conditions. The carbodiimide matrix thus offers a straightforward structural alternative to oxide systems and a clear-cut starting point for optimization strategies and for mechanistic studies on the possible role of active carbon or nitrogen sites. This paves the way to metal carbodiimides as a novel catalyst design platform for heterogeneous energy conversion systems.
- Published
- 2015
7. Nickel nitride as an efficient electrocatalyst for water splitting
- Author
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Menny Shalom, Debora Ressnig, Tim-Patrick Fellinger, Xiaofei Yang, Markus Antonietti, and Guylhaine Clavel
- Subjects
Materials science ,Hydrogen ,Renewable Energy, Sustainability and the Environment ,Inorganic chemistry ,Oxygen evolution ,chemistry.chemical_element ,General Chemistry ,Overpotential ,Nitride ,Electrocatalyst ,Catalysis ,Nickel ,chemistry ,Water splitting ,General Materials Science - Abstract
Efficient, robust and low cost materials as electrocatalysts for energy-related applications are highly desired for the future of renewable energy production. Here we show a simple method to fabricate nickel nitride (Ni3N) on nickel (Ni) foam for electrocatalytic applications. The Ni3N/Ni-foam exhibits extremely low overpotential (∼50 mV), high current density and excellent stability for the hydrogen evolution reaction (HER) in alkaline solution. In addition, the modified foam demonstrates enhanced activity in the oxygen evolution (OER) and reduction (ORR) reaction compared to original Ni-foam. The activity enhancement can be attributed to the facile formation of a Ni(OH)2 layer on the nitride layer due to improved lattice matching. The formation of the Ni3N/Ni(OH)2 catalyst results in lower overpotentials due to easier water dissociation on the nickel hydroxide layer. In addition, the HER is further improved due to stronger adsorption of hydrogen to the metal nitride than to the pure metal. We believe that the utilization of nickel nitride as an electrocatalyst opens opportunities for energy-related devices such as batteries and fuel cells.
- Published
- 2015
8. Decomposition synthesis of tuneable, macroporous carbon foams from crystalline precursors via in situ templating
- Author
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Tristan Corbiere, Markus Antonietti, Thomas Lunkenbein, U. Braun, Marc Georg Willinger, and Debora Ressnig
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Materials science ,Renewable Energy, Sustainability and the Environment ,Heteroatom ,Thermal decomposition ,Alloy ,chemistry.chemical_element ,Foaming agent ,Sorption ,General Chemistry ,engineering.material ,Decomposition ,chemistry ,Chemical engineering ,engineering ,Organic chemistry ,General Materials Science ,Fourier transform infrared spectroscopy ,Carbon - Abstract
A flexible, sustainable, one-step thermal decomposition route for the synthesis of hierarchical, heteroatom doped carbon foams is presented. Task-specific semi-organic crystals combine functions for three different purposes: the carbon and heteroatom source, a foaming agent (CO2) and an in situ generable template (NaCl). Insights to the decomposition pathway were gained through FTIR/MS coupled TGA and an ultrafast out-of-furnace heating procedure and the products were analysed with (HR)SEM/TEM, EELS, FTIR, and N2 sorption. The resulting macroporous carbon foams are excellent supports for metallic nanoparticles due to their hierarchical structure, high surface area and tuneable heteroatom contents. This was demonstrated for catalytically active copper or the magnetic CoNi alloy for water purification.
- Published
- 2014
9. Morphology control of BiVO4 photocatalysts: pH optimization vs. self-organization
- Author
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Roman Kontic, Debora Ressnig, Greta R. Patzke, University of Zurich, and Patzke, Greta R
- Subjects
10120 Department of Chemistry ,Materials science ,3104 Condensed Matter Physics ,Dimethyl methylphosphonate ,Inorganic chemistry ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Hydrothermal circulation ,2500 General Materials Science ,0104 chemical sciences ,Catalysis ,Nanomaterials ,chemistry.chemical_compound ,chemistry ,Bismuth vanadate ,540 Chemistry ,Degradation (geology) ,General Materials Science ,Reactivity (chemistry) ,Crystallite ,0210 nano-technology - Abstract
The influence of the pH value on the hydrothermal formation of BiVO 4 photocatalysts from Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 was investigated. Optimal nanostructuring and surface area values are obtained for BiVO 4 nanoplatelets synthesized at pH 4. Screening of phosphorus-containing templates brought forward dimethyl methylphosphonate (DMMP) as the most efficient surfactant to fine-tune the synthesis of hierarchically structured BiVO 4 architectures. Their growth processes were subsequently monitored with ex situ studies. The formation of different BiVO 4 microsphere types proceeds via a gradual transformation of zircon-type BiVO 4 precursors into self-organized hollow shells of monoclinic BiVO 4 crystallites. A slight variation of the synthetic conditions induces the formation of dumbbell-shaped BiVO 4 particles consisting of small BiVO 4 building blocks arranged around a cylindrical core unit via a different pathway. Catalytic test series for organic dye degradation and water oxidation show that template-free BiVO 4 nanoplatelets obtained at pH 4 exhibit optimal activity in both processes. Their MB degradation performance is further improved in alkaline media and the influence of synthetic parameter tuning on BiVO 4 catalyst growth and reactivity is discussed.
- Published
- 2012
10. Focused radiation heating for controlled high temperature chemistry, exemplified with the preparation of vanadium nitride nanoparticles
- Author
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Cristina Giordano, Tristan Corbiere, Markus Antonietti, and Debora Ressnig
- Subjects
Temperature control ,General Chemical Engineering ,Vanadium nitride ,Oxide ,Analytical chemistry ,Nanoparticle ,chemistry.chemical_element ,General Chemistry ,Nitrogen ,law.invention ,Crystallinity ,chemistry.chemical_compound ,Halogen lamp ,chemistry ,law ,visual_art ,visual_art.visual_art_medium ,Ceramic - Abstract
A compact apparatus employing heating with concentrated light was designed for desktop laboratory application to run syntheses in the range 200–850 °C in short times under a satisfying control of the temperature, heating ramps, and adjustable chemical environments. The device is composed of 4 halogen lamps oriented to a centre point and allows fast heating rates up to 100 K min−1 of medium size scale samples (volume < 7 mL). This method can be proven to be more energetically efficient and allows for better temperature control over standard furnace methods. Herein we exemplify with a typical high temperature synthesis of non-oxide ceramic (vanadium nitride) nanoparticles. These nanoparticles can be obtained in different sizes and crystallinity ranges by varying the reaction conditions, following the urea glass route and applying the non-classical rapid heating method. Nanoparticles containing both carbon and nitrogen and showing the typical crystal structure of VN were obtained with sizes below 10 nm within a short reaction time (5 min at 750 °C) and in a fast heating procedure (50 K min−1). Moreover, quasi-quenching of samples through a fast cooling procedure allows the detection of various intermediate oxide species that otherwise were not observed.
- Published
- 2013
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