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Marc Fontecave - One of the best experts on this subject based on the ideXlab platform.
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porous dendritic copper an electrocatalyst for highly selective co2 reduction to formate in water ionic liquid electrolyte
Chemical Science, 2017Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
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Porous dendritic copper: an electrocatalyst for highly selective CO2 reduction to formate in water/ionic liquid electrolyte.
Chemical science, 2016Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
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Porous dendritic copper: an electrocatalyst for highly selective CO 2 reduction to formate in water/ ionic liquid electrolyte
Chemical Science, 2016Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO 2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO 2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
Maurice-bernard Fleury - One of the best experts on this subject based on the ideXlab platform.
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A Biomimetic Electrocatalytic System for the Atom-Economical Chemoselective Synthesis of Secondary Amines
Organic letters, 2009Co-Authors: Martine Largeron, Maurice-bernard FleuryAbstract:A facile one-pot oxidation−imine formation−reduction route to secondary amines can be achieved electrolytically from primary amines. This atom-economical 1ox-mediated sequence, leaving ammonia as the sole byproduct, allows the rapid chemoselective synthesis of secondary amines, at both ambient temperature and pressure.
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Environmentally Friendly Chemoselective Oxidation of Primary Aliphatic Amines by Using a Biomimetic Electrocatalytic System
Chemistry - A European Journal, 2008Co-Authors: Martine Largeron, Maurice-bernard FleuryAbstract:Environmentally friendly oxidation of primary aliphatic amines to imines has been successfully achieved, under metal-free conditions, by the use of diverse electrogenerated o-azaquinone mediators. High catalytic performance, together with high chemoselectivity, were observed with electron-poor o-azaquinone catalysts generated from 2-aminoresorcinol derivatives. Similar to copper amine oxidases enzymes, these mediators exhibited lower reactivity with α-branched primary amines and no reactivity toward secondary amines. In the case of 3,4aminophenol derivatives which lack the 2hydroxyl group, the generated o-azaquinone species failed to catalyze the oxidation of the amine to the corresponding imine. Further mechanistic considerations allowed to justify the crucial role of the 2-hydroxyl group to convert a catalytic inert species into a highly effective biomimetic catalyst.
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Environmentally friendly chemoselective oxidation of primary aliphatic amines by using a biomimetic Electrocatalytic System.
Chemistry - A European Journal, 2008Co-Authors: Martine Largeron, Angèle Chiaroni, Maurice-bernard FleuryAbstract:Environmentally friendly oxidation of primary aliphatic amines to imines has been successfully achieved, under metal-free conditions, by the use of diverse electrogenerated o-azaquinone mediators. High catalytic performance, together with high chemoselectivity, were observed with electron-poor o-azaquinone catalysts generated from 2-aminoresorcinol derivatives. Similar to copper amine oxidase enzymes, these mediators exhibited lower reactivity toward alpha-branched primary amines and no reactivity toward secondary amines. In the case of 3,4-aminophenol derivatives lacking a 2-hydroxy group, the generated o-azaquinone species failed to catalyze the oxidation of the amine to the corresponding imine. Further mechanistic considerations allowed a rationalization of the crucial role of the 2-hydroxy group in converting a catalytically inert species into a highly effective biomimetic catalyst.
Martine Largeron - One of the best experts on this subject based on the ideXlab platform.
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An Electrocatalytic System that Mimics the Catalytic Oxidation of Biogenic Mono- and Polyamines by Semicarbazide-sensitive Amine Oxidases (SSAOs)
ECS Transactions, 2019Co-Authors: Martine Largeron, M.b. Fleury, Margherita Strolin BenedettiAbstract:Chemoselective oxidation of primary aliphatic biogenic mono- and polyamines into imines has been successfully achieved, under metal-free conditions, by using an Electrocatalytic System that mimics the activity of semicarbazide-sensitive amine oxidase (SSAO) enzymes. Accordingly, high catalytic performance was observed with unbranched primary amines such as methylamine and aminoacetone, and with the primary amino groups of diamines and polyamines like putrescine and spermidine, all of them being reference substrates for SSAO enzymes. Furthermore, contrary to flavin-adenine dinucleotide (FAD)-dependent amine oxidase enzymes, no activity was found with secondary and tertiary amines. Finally, when compared with the direct electrochemical oxidation of primary aliphatic amines, which occurs at high anodic potential (Ean > + 1.5 V vs SCE) and led to unstable cation radicals that rapidly deprotonate and attach to the electrode surface (Pt, carbon), 1.0 V was gained using this Electrocatalytic process (Ean = + 0.5 V vs SCE).
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A Biomimetic Electrocatalytic System for the Atom-Economical Chemoselective Synthesis of Secondary Amines
Organic letters, 2009Co-Authors: Martine Largeron, Maurice-bernard FleuryAbstract:A facile one-pot oxidation−imine formation−reduction route to secondary amines can be achieved electrolytically from primary amines. This atom-economical 1ox-mediated sequence, leaving ammonia as the sole byproduct, allows the rapid chemoselective synthesis of secondary amines, at both ambient temperature and pressure.
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Environmentally Friendly Chemoselective Oxidation of Primary Aliphatic Amines by Using a Biomimetic Electrocatalytic System
Chemistry - A European Journal, 2008Co-Authors: Martine Largeron, Maurice-bernard FleuryAbstract:Environmentally friendly oxidation of primary aliphatic amines to imines has been successfully achieved, under metal-free conditions, by the use of diverse electrogenerated o-azaquinone mediators. High catalytic performance, together with high chemoselectivity, were observed with electron-poor o-azaquinone catalysts generated from 2-aminoresorcinol derivatives. Similar to copper amine oxidases enzymes, these mediators exhibited lower reactivity with α-branched primary amines and no reactivity toward secondary amines. In the case of 3,4aminophenol derivatives which lack the 2hydroxyl group, the generated o-azaquinone species failed to catalyze the oxidation of the amine to the corresponding imine. Further mechanistic considerations allowed to justify the crucial role of the 2-hydroxyl group to convert a catalytic inert species into a highly effective biomimetic catalyst.
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Environmentally friendly chemoselective oxidation of primary aliphatic amines by using a biomimetic Electrocatalytic System.
Chemistry - A European Journal, 2008Co-Authors: Martine Largeron, Angèle Chiaroni, Maurice-bernard FleuryAbstract:Environmentally friendly oxidation of primary aliphatic amines to imines has been successfully achieved, under metal-free conditions, by the use of diverse electrogenerated o-azaquinone mediators. High catalytic performance, together with high chemoselectivity, were observed with electron-poor o-azaquinone catalysts generated from 2-aminoresorcinol derivatives. Similar to copper amine oxidase enzymes, these mediators exhibited lower reactivity toward alpha-branched primary amines and no reactivity toward secondary amines. In the case of 3,4-aminophenol derivatives lacking a 2-hydroxy group, the generated o-azaquinone species failed to catalyze the oxidation of the amine to the corresponding imine. Further mechanistic considerations allowed a rationalization of the crucial role of the 2-hydroxy group in converting a catalytically inert species into a highly effective biomimetic catalyst.
Tran Ngoc Huan - One of the best experts on this subject based on the ideXlab platform.
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porous dendritic copper an electrocatalyst for highly selective co2 reduction to formate in water ionic liquid electrolyte
Chemical Science, 2017Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
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Porous dendritic copper: an electrocatalyst for highly selective CO2 reduction to formate in water/ionic liquid electrolyte.
Chemical science, 2016Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
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Porous dendritic copper: an electrocatalyst for highly selective CO 2 reduction to formate in water/ ionic liquid electrolyte
Chemical Science, 2016Co-Authors: Tran Ngoc Huan, Philippe Simon, Gwenaelle Rousse, Isabelle Genois, Vincent Artero, Marc FontecaveAbstract:Copper is currently extensively studied because it provides promising electrodes for carbon dioxide electroreduction. The original combination, reported here, of a nanostructured porous dendritic Cu-based material, characterized by electron microcopy (SEM, TEM) and X-ray diffraction methods, and a water/ionic liquid mixture as the solvent, contributing to CO 2 solubilization and activation, results in a remarkably efficient (large current densities at low overpotentials), stable and selective (large faradic yields) Electrocatalytic System for the conversion of CO 2 into formic acid, a product with a variety of uses. These results provide new directions for the further improvement of Cu electrodes.
Fang Chen - One of the best experts on this subject based on the ideXlab platform.
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Studies of Sol−Gel Ceramic Film Incorporating Methylene Blue on Glassy Carbon: An Electrocatalytic System for the Simultaneous Determination of Ascorbic and Uric Acids
Analytical chemistry, 2002Co-Authors: Soo Beng Khoo And, Fang ChenAbstract:In this work, we investigated the immobilization of methylene blue in a methyltrimethoxysilane sol−gel ceramic film on a glassy carbon electrode. Up to a certain saturation level, under our conditions, it was found that the methylene blue was tightly held and did not leach out into aqueous solutions, even with continuous immersion for up to 1 month. The electrochemical behavior of the immobilized methylene blue was then studied. pH variation revealed that there were two distinct redox couples whose existences were pH-dependent. The methylene blue/sol−gel film was also examined as an Electrocatalytic System for ascorbic and uric acid oxidations. It was revealed that this System was highly sensitive for ascorbic and uric acid sensing (practical determination limits of 5.00 nM and 1.00 nM for ascorbic acid and uric acid, respectively) and also allowed simultaneous determination of these biomolecules. The simultaneous determination of these two analytes in a human urine sample was demonstrated. The stability ...
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studies of sol gel ceramic film incorporating methylene blue on glassy carbon an Electrocatalytic System for the simultaneous determination of ascorbic and uric acids
Analytical Chemistry, 2002Co-Authors: Fang ChenAbstract:In this work, we investigated the immobilization of methylene blue in a methyltrimethoxysilane sol−gel ceramic film on a glassy carbon electrode. Up to a certain saturation level, under our conditions, it was found that the methylene blue was tightly held and did not leach out into aqueous solutions, even with continuous immersion for up to 1 month. The electrochemical behavior of the immobilized methylene blue was then studied. pH variation revealed that there were two distinct redox couples whose existences were pH-dependent. The methylene blue/sol−gel film was also examined as an Electrocatalytic System for ascorbic and uric acid oxidations. It was revealed that this System was highly sensitive for ascorbic and uric acid sensing (practical determination limits of 5.00 nM and 1.00 nM for ascorbic acid and uric acid, respectively) and also allowed simultaneous determination of these biomolecules. The simultaneous determination of these two analytes in a human urine sample was demonstrated. The stability ...