We have examined for the first time the hydrogen evolution reaction (HER) activity at the (111), (100), and (110) faces of well-defined Pt-skin/Pt₃Co single crystal electrodes in H₂-saturated 0.1 M HClO₄ solution in order to clarify the mechanism for the increased HER activities at Pt-skin/Pt-M (M = Co, Fe) nanoparticles dispersed on a carbon support, which we recently developed as highly active cathode catalysts for proton exchange membrane electrolyte water electrolysis. The HER current densities at −0.02 V vs. RHE for the Pt-skin/Pt₃Co single crystal rotating disk electrodes increased in the order (100) < (111) < (110), which is identical with that reported for pure Pt single crystal electrodes. Based on density functional theory calculations, the increase in the HER activity is ascribed to the destabilization of the on-top form of adsorbed atomic hydrogen (H_OPD), which facilitates the recombination and desorption of two H_OPD atoms to produce molecular H₂.

我们首次检查了H ₂饱和0.1中定义明确的Pt-skin / Pt ₃ Co单晶电极在（111），（100）和（110）面上的析氢反应（HER）活性。为了阐明在分散在碳载体上的Pt-皮肤/ Pt-M（M = Co，Fe）纳米颗粒上HER活性增加的机理，我们使用了M HClO ₄溶液，我们最近将其开发为质子交换膜的高活性阴极催化剂电解质水电解。Pt皮肤/ Pt ₃在-0.02 V下的HER电流密度与RHE的关系Co单晶转盘电极按（100）<（111）<（110）的顺序增加，这与纯Pt单晶电极报道的相同。根据密度泛函理论计算，HER活性的增加归因于吸附原子氢（H _OPD）的顶部形成形式的不稳定，这促进了两个H _OPD原子的重组和解吸以产生分子H ₂。