Enhancement of hydrogen evolution activity on Pt-skin/Pt3Co [(111), (100), and (110)] single crystal electrodes
Enhancement of hydrogen evolution activity on Pt-skin/Pt3Co [(111), (100), and (110)] single crystal electrodes
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DOI：
10.1016/j.elecom.2019.106615
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发表时间：
2020-01-01
影响因子：
5.4
通讯作者：
Uchida, H.
中科院分区：
文献类型：
--
作者：
Kobayashi, S.;Tryk, D. A.;Uchida, H.
我们首次在 H-2 饱和的 0.1 M HClO4 溶液中检查了明确定义的 Pt-skin/Pt3Co 单晶电极的 (111)、(100) 和 (110) 面的析氢反应 (HER) 活性，以阐明分散在碳载体上的 Pt-skin/Pt-M (M = Co, Fe) 纳米粒子的 HER 活性增加的机制，我们最近将其开发为 用于质子交换膜电解质水电解的高活性阴极催化剂。 Pt-皮/Pt3Co 单晶旋转盘电极在 -0.02 V 与 RHE 下的 HER 电流密度按 (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活性的增加归因于顶部形式的吸附原子氢（H-OPD）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。
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 H-2-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 H-2.