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Electrochemical hydrogen evolution in hydroxide hydrate down to 110 K
Affiliation:1. Plant Bioactives Group, Post-Harvest and Agro-Processing Technologies, Agricultural Research Council (ARC) Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa;2. Department of Food Science, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa;1. Hubei University of Science and Technology, Institute of New Energy Materials and Solar Cells, Xianning, HuBei 437100, P. R. China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, HuBei 430074, P. R. China;1. University of Lyon, Institute of Analytical Chemistry, LSA Department, 5 Rue de la Doua, 69100 Villeurbanne, France;2. INRA, UR1197 Neurobiologie de l’Olfaction et Modélisation en Imagerie, F-78350 Jouy-en-Josas, France;3. IFR 144, NeuroSud Paris, F-91190 Gif-Sur-Yvette, France;4. Key Laboratory of Pesticides and Chemical Biology, Huazhong Normal University, Luoyu Str 152, Hongshan District, 430079 Wuhan, China
Abstract:Electrochemical hydrogen evolution was studied at an Au electrode in liquid and solid tetramethylammonium hydroxide hydrate (CH3)4NOH·10H2O (m.p. 253 K) down to almost 110 K. The current–potential relationships were obtained by slow scan voltammetry. The lowering of temperature causes substantial decrease of the slope of linear Tafel plots. This was interpreted as a decrease of charge transfer coefficient from 0.37 at room temperature to 0.01 at 113 K. The activation energy of the electrochemical hydrogen evolution at temperatures below 200 K is equal to 0.25±0.03 eV and is larger than the activation energy of the electrolyte conductivity.
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