期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 660, 期 2, 页码 224-229出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.01.016
关键词
Electrodeposited gold; Barrierless discharge; Ordinary discharge; Overpotential; Psi(1)-effect; Overpotential-pH dependence
资金
- Russian Foundation for Basic Research [09-03-00085-a]
Kinetics of hydrogen evolution reaction on the electrodeposited gold electrode is studied. In semi-logarithmic coordinates, polarization curves consist of two linear segments with Tafel slopes 0.06 V at lower overpotentials and 0.12 V at the higher ones. The kinetics in the higher-slope region depends on the solution pH and the Psi(1)-potential (effects of the ionic strength and of the presence of the surface-active tetrabutylammonium cation) as it is predicted by the theory of the ordinary slow discharge. In the lower-slope region, overpotential does not depend on pH and Psi(1)-potential; this is in full accordance with the theory of the barrierless discharge. We nevertheless analyze also several alternatives to the theory of barrierless discharge for the explanation of the low-slope region, but we show that they are not consistent with the experimental data. (C) 2011 Elsevier B.V. All rights reserved.
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