磷化物
镍
无机化学
分解水
X射线光电子能谱
制氢
过电位
纳米颗粒
析氧
吸附
作者
Tianyun Chen,Bo Ye,Haojiang Dai,Shan Qin,Yaqi Zhang,Qinghua Yang
标识
DOI:10.1016/j.jssc.2021.122299
摘要
Abstract The development of non-noble-metal catalysts plays a great role in production of hydrogen by water cracking. Here, we found the performance and efficiency of the transition metal phosphides for hydrogen evolution reaction (HER) can be improved by adjusting the morphology and electronic structure of electrocatalys. In this work, We have developed a kind of catalyst (Ni-doped CoP/Co2P NSs and starfish-like CoP/Co2P) with different morphologies. In electrochemical tests, Ni-doped CoP/Co2P NSs exhibits the excellent catalytic activity, showing that the overpotentials are only 100 mV (0.5 M H2SO4) and 125 mV (1 M KOH) for HER to afford the current density of 10 mA cm−2 and a Tafel slope of 66 mV dec−1 (0.5 M H2SO4) and 73 mV dec−1 (1 M KOH). Furthermore, Ni-doped CoP/Co2P NSs has great stability and robustness, which demonstrated by 12 h of chronoamperometry test and 3000 cycles test, showing that it maintains 98% (0.5 M H2SO4) and 93% (1 M KOH) of the current density of 10 mA cm−2. The reason for the excellent catalytic performance and robustness of Ni-doped CoP/Co2P NSs may be ascribed to the facts that the addition of Ni element leads to the change of material electron valence states, with synergistic effect with Co atoms, which possess outstanding performance of the catalyst.
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