Journal
ELECTROCHIMICA ACTA
Volume 255, Issue -, Pages 391-395Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.09.127
Keywords
Hydrogen evolution; Activation energy; pre-exponential factor; Pt(111)
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Funding
- National Natural Science Foundation of China [21473175]
- 973 program from the ministry of science and technology of China [201503932301]
- Deutsche Forschungsgemeinschaft [FOR 1376]
- Humboldt Foundation
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Hydrogen evolution on Pt(111) is investigated as a function of temperature; the results are interpreted in terms of the theory of electrocatalysis. The current-potential curves are consistent with a Volmer-Tafel mechanism, in which the recombination of two weakly adsorbed hydrogen atoms determines the overall rate, and in which the adsorbed hydrogen shows a repulsive interaction. The pre-exponential factor of about 10(9)A cm(-2) is high and indicates a rate determining step that occurs only on the surface. The activation energy is of the order of 0.5 - 0.6 eV and concurs with previous theoretical estimates. (C) 2017 Elsevier Ltd. All rights reserved.
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