Bimetallic site substitution of NiCoP nanoneedles as bifunctional electrocatalyst for boosted water splitting  

作　　者：Ya Gao Yuhui Qiao Xuanrong Li Chengyu Huang Jing Zhang Yirong Wang Xingli Zou Zhonghong Xia Xinxin Yang Xionggang Lu Yufeng Zhao 

机构地区：[1]College of Sciences and Institute for Sustainable Energy, Shanghai University, Shanghai, 200444, China [2]School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China [3]State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai, 200444, China

出　　处：《Nano Research》2024年第11期9540-9549,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22179077 and 22479091);Shanghai Science and Technology Commission’s “2020 Science and Technology Innovation Action Plan”(No.20511104003);Natural Science Foundation in Shanghai(No.21ZR1424200);the National Natural Science Foundation of China(No.52334009);the Science and Technology Commission of Shanghai Municipality(No.21DZ1208900);Project of ShangHai Gas Turbine Union Innovation Center(No.GYQ1-2023-1-06);Postdoctoral Fellowship Program of CPSF(No.GZC20231536).

摘　　要：The bimetallic nickel-cobalt phosphide (NiCoP) has been confirmed as an efficient electrocatalyst in water splitting. But little attention is paid to the selectivity and affinity of metal sites on hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a trace-Zn-doping (2.18 wt.%) NiCoP (Zn-NiCoP) whereby the nanoparticles self-aggregated to form elongated nanoneedles. We discover that both Co and Ni sites can be replaced by Zn. The Co substitution improves HER, while the Ni substitution dramatically reduces the energy barrier of the rate-determining step (*O → *OOH). The negative shift of d-band centers after Zn doping ameliorates the intermediate desorption. Therefore, Zn-NiCoP demonstrates superior electrocatalytic activity with overpotentials of 48 and 240 mV for HER and OER at 10 and 50 mA·cm^(−2), respectively. The cell voltage with Zn-NiCoP as both anode and cathode in water splitting was as low as 1.35 V at 10 mA·cm^(−2).

关 键 词：Zn doping bimetallic phosphides bifunctional electrocatalyst overall water splitting 

分 类 号：O64[理学—物理化学]