Abstract
The electrochemical oxidation of single-crystal gold surfaces has been well studied, and the exposed crystal planes can be reliably distinguished based on the peak potentials of oxide formation. However, the multiple oxidation peaks of polycrystalline gold have not yet been unambiguously related to crystal planes. In this work, we used cyclic voltammetric responses of activated polycrystalline gold electrodes recorded in sulfuric acid solutions to allow constructing relationships between crystal planes and oxide peaks. The studies of oxide formation were complemented by measuring double-layer non-faradaic currents, lead underpotential deposition (Pb-upd), the oxygen reduction reaction (ORR), and the hydrogen evolution reaction (HER).
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F. Sch. dedicates this contribution to Professor György Inzelt on the occasion of his 70th birthday. György is a true friend, great scientist, and erudite scholar with interest ranging out to all areas of human activity. I wish to have in future many more occasions to meet György and have rewarding conversations about scientific problems and the course of the world.
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Jeyabharathi, C., Ahrens, P., Hasse, U. et al. Identification of low-index crystal planes of polycrystalline gold on the basis of electrochemical oxide layer formation. J Solid State Electrochem 20, 3025–3031 (2016). https://doi.org/10.1007/s10008-016-3228-1
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DOI: https://doi.org/10.1007/s10008-016-3228-1