Free-Standing Multiscale Porous High Entropy NiFeCoZn Alloy as the Highly Active Bifunctional Electrocatalyst for Alkaline Water Splitting  

作　　者：Qiuping Zhang Xu Wang Tianzhen Jian Wenqing Ma Caixia Xu Qiuxia Zhou Hong Liu 

机构地区：[1]Institute for Advanced Interdisciplinary Research(iAIR),Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong,School of Chemistry and Chemical Engineering,University of Jinan,Jinan,Shandong 250022,China [2]School of Medical Information and Engineering,Southwest Medical University,Luzhou,Sichuan 646000,China [3]State Key Laboratory of Crystal Materials,Shandong University,Jinan,Shandong 250100,China

出　　处：《Chinese Journal of Chemistry》2024年第13期1465-1473,共9页中国化学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(52201254);the Natural Science Foundation of Shandong Province(ZR2023ME155,ZR2020MB027);the project of“20 Items of University”of Jinan(202228046),and thee Taishan Scholar Project of Shandong Province(tsqn202306226);Southwest Medical University level research project(2022QN030).

摘　　要：In the endeavor of searching for highly active and stable electrocatalysts toward overall water splitting,high-entropy-alloys have been the intense subjects owing to their advanced physicochemical property.The non-noble metal free-standing multiscale porous NiFeCoZn high-entropy-alloy is in situ constructed on the surface layer of NiZn intermetallic and Ni heterojunction over nickel foam(NiFeCoZn/NiZn-Ni/NF)by one scalable dealloying protocal to fulfill the outstanding bifunctional electrocatalytic performances toward overall water splitting.Because of the high-entropy effects and specific hierarchical porous architecture,the as-made NiFeCoZn/NiZn-Ni/NF displays high intrinsic catalytic activities and durability toward both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline media.In particular,the in-situ construction of bimodal porous NiFeCoZn high-entropy-alloy results in the small overpotentials(η1000=254/409 mV for HER and OER),low Tafel slopes,and exceptional long-term catalytic durability for 400 h.Expressively,the electrolyzer constructed with NiFeCoZn/NiZn-Ni/NF as both cathode and anode exhibits a low cell voltage of 1.72 V to deliver the current density of 500 mA·cm^(–2) for overall water splitting.This work not only provides a facile and scalable protocol for the preparation of self-supporting high-entropy-alloy nanocatalysts but also enlightens the engineering of high performance bifunctional electrocatalysts toward water splitting.

关 键 词：High-entropy-alloys Bifunctional electrocatalyst Dealloying/Electrocatalysis Oxygen evolution reaction Hydrogen evolution reaction 

分 类 号：TQ116.21[化学工程—无机化工] TQ426