Nature of Highly Active Electrocatalytic Sites for the Hydrogen Evolution Reaction at Pt Electrodes in Acidic Media,ACS Omega

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Nature of Highly Active Electrocatalytic Sites for the Hydrogen Evolution Reaction at Pt Electrodes in Acidic Media
ACS Omega ( IF 3.7 ) Pub Date : 2017-11-20 00:00:00 , DOI: 10.1021/acsomega.7b01126
Marcus D Pohl ₁ , Sebastian Watzele ₁ , Federico Calle-Vallejo _{2,

3} , Aliaksandr S Bandarenka _{1,

4}

Affiliation

The hydrogen evolution reaction (HER) is one of the two processes in electrolytic water splitting. Known for more than two centuries, the HER still receives great attention in fundamental and applied science in view of its apparent simplicity (only two electrons are transferred), fast kinetics in acidic media, and promising technological applications in electrolyzers. However, the exact nature of active catalytic sites for this reaction is often uncertain, especially at nonuniform metal electrodes. Identification of such centers is important, as the HER will probably be central in future energy provision schemes, and it is simultaneously a convenient model reaction to study structure–composition–activity relations in catalysis. In this work, using simple coordination–activity considerations, we outline the location and geometric configuration of the active sites at various model Pt single-crystal electrodes. We show that when the coordination of such surface sites is optimized and their density at the surface is maximized, the experimental-specific HER activities are among the highest reported in the literature for pure platinum with a well-defined surface structure under similar conditions.

中文翻译：

酸性介质中 Pt 电极析氢反应高活性电催化位点的性质

析氢反应（HER）是电解水分解的两个过程之一。HER 已知两个多世纪了，由于其明显的简单性（仅转移两个电子）、酸性介质中的快速动力学以及在电解槽中的有前景的技术应用，仍然受到基础科学和应用科学的极大关注。然而，该反应的活性催化位点的确切性质通常是不确定的，特别是在不均匀的金属电极上。识别这些中心很重要，因为 HER 可能会成为未来能源供应方案的核心，同时它也是研究催化中结构-组成-活性关系的便捷模型反应。在这项工作中，使用简单的配位活性考虑因素，我们概述了各种模型 Pt 单晶电极的活性位点的位置和几何结构。我们表明，当这些表面位点的配位得到优化并且它们在表面的密度最大化时，在类似条件下具有明确表面结构的纯铂的实验特异性 HER 活性是文献中报道的最高水平之一。

更新日期：2017-11-20

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