Electrocatalytic mediation of oxidation of H2 at gold by chemisorbed states of anions |
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| Institution: | 1. Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden;2. Johannes Kepler University Linz, IEP-AOP, Altenbergerstraße 69, A-4040 Linz, Austria;1. Department of Biotechnology, Julianalaan 67, Delft 2628 BC, The Netherlands;2. Unilever R&D Vlaardingen, Olivier van Noortlaan 120, Vlaardingen 3133 AT, The Netherlands;1. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, ON, Canada L1H 7K4;2. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, 240 Prince Phillip Drive, St. John''s, NL, Canada, A1B 3X5;1. School of Environmental Science and Engineering, Chang’an University, Xi’an, 710064, China;2. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Eduction, 710064, Xi’an, China;3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;1. Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan;2. Department of Chemistry and Biological Science, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo, Sagamihara, Kanagawa 252-5258, Japan;1. State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing 100088, China;2. GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China |
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| Abstract: | On Au, free surface atoms are not active for dissociative oxidation of the H2 molecule but at potentials where anions are chemisorbed or complexes of partially discharged OH(1−γ− with the chemisorbed anions arise, the H2 molecule can be dissociated and consequently the H-atom electrochemically oxidized.This phenomenon is observed on Au (110), (100) single-crystal surfaces, and to a lesser degree on the (111) plane, as well as on polycrystalline Au. The rate of the reaction is proportional to the quantity of discharged species and is higher when the oxidation occurs by mediation by the complexes. The reaction is inhibited, however, by fully discharged OH. A microscopic surface-chemical model of the reaction is proposed and examined in relation to the experimental behaviour at the (110) plane in 0.01 M HClO4. |
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