Highly efficient and stable electrocatalyst for hydrogen evolution by molybdenum doped Ni-Co phosphide nanoneedles at high current density  

作　　者：Chengyu Huang Zhonghong Xia Jing Wang Jing Zhang Chenfei Zhao Xingli Zou Shichun Mu Jiujun Zhang Xionggang Lu Hong Jin Fan Shengjuan Huo Yufeng Zhao 

机构地区：[1]College of Sciences&Institute for Sustainable Energy,Shanghai University,Shanghai 200444,China [2]State Key Laboratory of Metastable Materials Science and Technology,Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse,Yanshan University,Qinhuangdao 066004,China [3]State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [4]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [5]School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,639798

出　　处：《Nano Research》2024年第3期1066-1074,共9页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(No.22179077);the National Natural Science Foundation Youth Fund(No.22209104);Shanghai Science and Technology Commission’s“2020 Science and Technology Innovation Action Plan”(No.20511104003);the Natural Science Foundation of Shanghai(No.21ZR1424200);Hebei provincial Department of Science and Technology(No.226Z4404G);Hebei Science Foundation(No.E2021203005).

摘　　要：There is an increasingly urgent need to develop cost-effective electrocatalysts with high catalytic activity and stability as alternatives to the traditional Pt/C in catalysts in water electrolysis.In this study,microspheres composed of Mo-doped NiCoP nanoneedles supported on nickel foam were prepared to address this challenge.The results show that the nanoneedles provide sufficient active sites for efficient electron transfer;the small-sized effect and the micro-scale roughness enhance the entry of reactants and the release of hydrogen bubbles;the Mo doping effectively improves the electrocatalytic performance of NiCoP in alkaline media.The catalyst exhibits low hydrogen evolution overpotentials of 38.5 and 217.5 mV at a current density of 10 mA·cm^(-2) and high current density of 500 mA·cm^(-2),respectively,and only 1.978 V is required to achieve a current density of 1000 mA·cm^(-2) for overall water splitting.Density functional theory(DFT)calculations show that the improved hydrogen evolution performance can be explained as a result of the Mo doping,which serves to reduce the interaction between NiCoP and intermediates,optimize the Gibbs free energy of hydrogen adsorption(△G_(*H)),and accelerate the desorption rate of *OH.This study provides a promising solution to the ongoing challenge of designing efficient electrocatalysts for high-current-density hydrogen production.

关 键 词：transition metal phosphides Mo-doped NiCoP hydrogen evolution reaction gradient hydrothermal water splitting 

分 类 号：O64[理学—物理化学]