电催化剂
催化作用
材料科学
电解质
氧化物
贵金属
化学工程
过电位
纳米颗粒
塔菲尔方程
氢
分解水
金属
电化学
无机化学
纳米技术
物理化学
电极
冶金
化学
有机化学
光催化
工程类
作者
Yubing Zhou,Min Luo,Wei Zhang,Zhenxin Zhang,Xiangdong Meng,Xiaoshuang Shen,Hongfei Liu,Min Zhou,Xianghua Zeng
标识
DOI:10.1021/acsami.9b03686
摘要
A Mo–Ni alloy has been demonstrated to be a benchmark noble-metal-free catalyst for the hydrogen evolution reaction (HER) in alkaline solutions. Nevertheless, further improvement on its catalytic activity is desired to meet industrial requirements. In this study, Mo–Ni-based hollow structures (MoNi-HS), backboned by MoO3–x nanosheets and decorated with metallic MoNi4 nanoparticles, were obtained via a topological transformation process by annealing MoNi-oxide hollow precursors in a reducing atmosphere. This hollow structure allowed for a large proportion of catalytic surface exposed in the electrolyte, leading to highly efficient utilization of active sites in the catalyst. As a result, robust catalytic activity toward HER was recorded in 1 M KOH electrolyte: a low overpotential of 38 mV to deliver a current density of 10 mA/cm2 and a very small Tafel slope of 31.4 mV per dec. Such a remarkable performance of MoNi-HS even outperformed the catalytic activity of the commercial Pt/C electrocatalyst, addressing an effective strategy to promote the catalytic performance of noble-metal-free catalysts.
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