Self-grown NiCuOx hybrids on a porous NiCuC substrate as an HER cathode in alkaline solution
Self-grown NiCuOx hybrids on a porous NiCuC substrate as an HER cathode in alkaline solution
复制标题
DOI：
10.1016/j.apsusc.2020.146117
复制
发表时间：
2020-06
影响因子：
6.7
通讯作者：
Linping Yu;Yanliu Dang;J. Zeng;Junkai He;Steven C. Murphy;Peter Kerns;S. Suib;Jian Zhang;Yuhai Dou
中科院分区：
文献类型：
--
作者：
Linping Yu;Yanliu Dang;J. Zeng;Junkai He;Steven C. Murphy;Peter Kerns;S. Suib;Jian Zhang;Yuhai Dou
直接从基材转化的电催化剂由于其高结合强度、紧密的电子接触和可调的相组成而成为实现高催化活性和耐久性的关键。本文采用一步氧化法，以导电多孔NiCuC为基体，制备多孔NiCuOx/NiCuC析氢反应催化剂。NiCuOxhybrids的特征在于三个典型的层：外层与NiCuO 2固溶体相，部分氧化的中间层，和具有有限的稳定氧含量的内层。NiCuOx/NiCuC催化剂具有丰富的Ni（Ⅱ）-Cu（Ⅱ）位，通过OH-的静电作用促进Volmer步骤的发生;大量的金属NiCu位，促进H的吸附;结果表明，在1.0 M氢氧化钾溶液中，电流密度为10 mA cm-2，过电位为116 mV，具有较高的电催化性能，并且在HER过程中催化性能稳定24 h以上。
Electrocatalysts converted directly from the substrates hold the key to achieve high catalytic activity and durability due to their high bonding strength, intimate electronic contact, and tunable phase composition. Herein, an electrically conductive porous NiCuC substrate was adopted to develop a multi-porous NiCuOx/NiCuC hydrogen evolution reaction (HER) catalyst using a one-step oxidation method in this research. The NiCuOxhybrids were characterized as three typical layers: an outer layer with NiCuO2solid solution phase, a partially oxidized intermediate layer, and an inner layer with limited stable oxygen content. The NiCuOx/NiCuC possesses abundant Ni(Ⅱ)-Cu(Ⅱ) sites to accelerate the Volmer step via the electrostatic effect with OH–, numerous metallic NiCu sites to facilitate the H adsorption, and highly accessible channels to promote the Heyrovsky step during HER catalysis. As a result, high electrocatalytic performance was obtained with an overpotential of 116 mV at a current density of 10 mA cm−2in 1.0 M potassium hydroxide, and a stable catalytic performance during the HER process for more than 24 h.