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

Literature Information

Publication Date 2010-09-28
DOI 10.1039/C0CP00780C
Impact Factor 3.676
Authors

Peter J. Schäfer, Ludwig A. Kibler


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Abstract

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.

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