Electrochemically activated metal oxide sites at Rh-Ni2P electrocatalyst for efficient alkaline hydrogen evolution reaction  

作　　者：Cheng Peng Jia-Yi Li Luo-Xiang Shi Ming-Yue Wang Wen-Hai Wang Tao Cheng Pei-Zhi Yang Hao Yang Kong-Lin Wu 

机构地区：[1]Institute of Clean Energy and Advanced Nanocatalysis(iClean),School of Chemistry and Chemical Engineering,Anhui University of Technology,Maanshan,243002,China [2]Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou,215123,China [3]Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University,Kunming,650500,China

出　　处：《Rare Metals》2024年第12期6416-6425,共10页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22375005,22103054 and 22173066);the Natural Science Research Project of Anhui Province Education Department(No.2022AH050323);the Foundation of Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University(No.OF2022-05);partly supported by Collaborative Innovation Center of Suzhou Nano Science&Technology;the 111 Project;Joint International Research Laboratory of Carbon-Based Functional Materials and Devices。

摘　　要：Highly efficient hydrogen evolution reaction(HER)electrocatalysts play a crucial part in generating green hydrogen.Herein,an electrochemical activation approach was applied to design 6.7 Rh-Ni_(2)P-800CV electrocatalysts in alkaline electrolytes.The results confirm that the generation of metal oxide sites through the electrochemical activation strategy can effectively improve the intrinsic activity of 6.7 Rh-Ni_(2)P-800CV.The density functional calculations further confirm that metal oxide active sites are favorable for H2O adsorption and activation and H*adsorption/desorption.The 6.7 Rh-Ni_(2)P-800CV possesses significantly enhanced HER performance with low overpotential(25 mV at 10 mA·cm^(2)),small Tafel(60 mV·dec^(-1))and robust stability in 1.0 M KOH,outperforming Pt/C and 6.7 Rh-Ni_(2)P counterparts.Meanwhile,6.7 Rh-Ni_(2)P-800CV can even operate at a large current density(550 mA·cm^(-2))up to 90 h with an overpotential of 320 mV,which meets the requirements of industrial water splitting.What's more,the overall watersplitting systems(6.7 Rh-Ni_(2)P-800CV‖6.7 Rh-Ni_(2)P-800CV)can be directly driven by the solar cell.This work highlights that electrochemical activation technology provides a robust avenue toward constructing efficient electrocatalysts for sustainable energy conversion.

关 键 词：Metal oxides Transition metal phosphide ELECTROCATALYSIS Alkaline water electrolysis Solar-powered hydrogen production 

分 类 号：O64[理学—物理化学]