A hierarchical NiFeOOH@CeO_(2−x)nanosheets array boosts electrocatalytic activity and durability at high current densities for water oxidation  

作　　者：Wei Zhang Liyang Xiao Xiaorui Huang Chunyan Han Ying Liu Jingtong Zhang Haiwen Tan Rui Zhang Pengfei Yin Cunku Dong Hui Liu Xiwen Du Jing Yang 

机构地区：[1]Institute of New Energy Materials,Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Nano Research》2025年第3期204-214,共11页纳米研究(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.51822106).

摘　　要：The oxygen evolution reaction(OER)reaction kinetics of nickel-iron(oxy)hydroxides(NiFeOOH)is limited by their weak adsorption of OER intermediates.Herein,a hierarchical NiFeOOH@CeO_(2−x)nanosheets array was in situ grown on a nickel foam by a facile laser direct writing method,which exhibits superior OER activity and durability at high current densities in alkaline electrolytes.The hierarchical nanosheets array exposes abundant catalytic active sites,which greatly promote OER reaction rate.The strong electronic interaction at the NiFeOOH/CeO_(2−x)interface leads to favorable electron transfer from Ni^(2+)/^(3+)and Fe^(3+)to Ce^(3+)/^(4+).The Ni sites with high valences show enhanced OH−adsorption and also promote the formation of*OOH intermediate,thereby greatly improving OER intrinsic activity.The oxygen deficient CeO_(2−x)primary sheets guarantee good electrical conductivity.Such a well-designed catalytic electrode requires overpotentials of only 229 and 287 mV to achieve current densities of 50 and 500 mA·cm^(−2),respectively,and sustains superior stability at 500 mA·cm^(−2)and 1 A·cm^(−2).

关 键 词：hierarchical nanosheets transition metal(oxy)hydroxides oxygen evolution reaction laser direct writing water splitting 

分 类 号：O64[理学—物理化学]