Bifunctional Electrocatalysts Based on Mo-Doped NiCoP Nanosheet Arrays for Overall Water Splitting

Nano-Micro Letters

卷:11

Zhengxiang Zhong¹  Jian Cao²  Yaotian Yan³  Chun Li³  Xiaoqing Si³  Junlei Qi³  Jinghuang Lin³  Weidong Fei³  Jicai Feng³  Haohan Wang³ 

[1] MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology;

[2] School of Materials Science and Engineering, Harbin Institute of Technology;

[3] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology;

关键词: Water splitting;    Bifunctional electrocatalyst;    Electronic structure;    Freestanding;    Metal phosphides;   

DOI  :  10.1007/s40820-019-0289-6

来源: DOAJ

【 摘 要 】

Abstract Rational design of efficient bifunctional electrocatalysts is highly imperative but still a challenge for overall water splitting. Herein, we construct novel freestanding Mo-doped NiCoP nanosheet arrays by the hydrothermal and phosphation processes, serving as bifunctional electrocatalysts for overall water splitting. Notably, Mo doping could effectively modulate the electronic structure of NiCoP, leading to the increased electroactive site and improved intrinsic activity of each site. Furthermore, an electrochemical activation strategy is proposed to form Mo-doped (Ni,Co)OOH to fully boost the electrocatalytic activities for oxygen evolution reaction. Benefiting from the unique freestanding structure and Mo doping, Mo-doped NiCoP and (Ni,Co)OOH show the remarkable electrochemical performances, which are competitive among current researches. In addition, an overall water splitting device assembled by both electrodes only requires a cell voltage of 1.61 V to reach a current density of 10 mA cm−2. Therefore, this work opens up new avenues for designing nonprecious bifunctional electrocatalysts by Mo doping and in situ electrochemical activation.

【 授权许可】

Unknown