Fe doped Ni5 P4 nanosheet arrays with rich P vacancies via phase transformation for efficient overall water splitting

Nanoscale
Junlei QiJicai Feng

Abstract

Proper vacancy engineering is considered as a promising strategy to improve intrinsic activity, but it is challenging to construct rich vacancies by a simple strategy. Herein, Fe doped Ni5P4 nanosheet arrays with rich P vacancies are developed via a facile phase transformation strategy. Based on systematic investigations, we have demonstrated that an optimized surface electronic structure, abundant active sites and improved charge transport capability can be effectively achieved by vacancy engineering. Consequently, Fe doped Ni5P4 with rich vacancies show remarkable catalytic performances with 94.5 mV for the hydrogen evolution reaction (HER) and 217.3 mV for the oxygen evolution reaction (OER) at 10 mA cm-2, respectively, as well as good durability. When directly employed as working electrodes, the as-obtained Fe doped Ni5P4 with rich vacancies can attain 10 mA cm-2 at a low voltage of 1.59 V. This work demonstrates a feasible strategy for rationally fabricating electrocatalysts with rich vacancies via a simple phase transformation.

References

May 9, 2013·Physical Chemistry Chemical Physics : PCCP·Richard L DoyleMichael E G Lyons
Jan 25, 2017·Inorganic Chemistry·Jianmei WangXuping Sun
Jun 11, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiaoqiang DuXiaoshuang Zhang

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