Incorporation of Pd into Au(111): enhanced electrocatalytic activity for the hydrogen evolution reaction

文献情報

出版日 2010-09-28

DOI 10.1039/C0CP00780C

インパクトファクター 3.676

著者

Peter J. Schäfer, Ludwig A. Kibler

原文を見る

要旨

While monolayer formation by under potential deposition of palladium from 0.1 M H2SO4 + 0.2 mM PdSO4 onto Au(111) commences around 0.6 V vs. SCE (saturated calomel electrode), there is evidence for slow incorporation of Pd0 into Au(111) under the same experimental conditions at 0.8 V, already. The presence of chloride traces suppresses such incorporation by forming stable complexes like [PdCl4]2−, which are strongly adsorbed on the surface. Less than 1% of a Pd monolayer are incorporated after immersion of Au(111) at 0.8 V into 0.1 M H2SO4 + 0.2 mM PdSO4 for 30 minutes. It is supposed that incorporated Pd preferentially occupies subsurface sites near Au steps, which is supported by theoretical calculations. Despite the low Pd coverage, the electrocatalytic activity for the hydrogen evolution reaction (HER) in 0.1 M H2SO4 is enormously high. The immersion time is crucial for the HER electrocatalytic activity.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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