Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 164, Issue 6, Pages H365-H374Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.1061706jes
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Funding
- Anadarko
- Baker Hughes
- BP
- Chevron
- China National Offshore Oil Corporation
- CNPC Tubular Goods Research Center
- ConocoPhillips
- DNV GL
- ExxonMobil
- M-I SWACO
- Occidental Oil Company
- Petroleum Institute
- PTT
- Saudi Aramco
- Shell Global Solutions
- SINOPEC
- TOTAL
- TransCanada
- WGK
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Despite numerous studies investigating the kinetics of the hydrogen evolution reaction (HER) on a gold surface in acidic solutions, the underlying mechanism of this reaction have remained controversial to date. In the present study, the existing mechanisms are reevaluated and found to be inadequate in explaining the steady state polarization behavior of the hydrogen evolution reaction in an extended cathodic potentials and mildly acidic pH range. It was shown that a mechanism including a surface diffusion step of H-ads alongside the Volmer, Heyrovsky, and Tafel elementary steps, best describes the experimental data obtained in acidic perchlorate solutions up to pH 5, while the rate determining step changes both with pH and electrode potential. This overall HER mechanism was further verified using a comprehensive mathematical model based on the proposed elementary steps, where a satisfactory agreement with experimental results was obtained. (C) The Author(s) 2017. Published by ECS.
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