Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution  

作　　者：Dazhong Zhong Tan Li Dong Wang Lina Li Jiancheng Wang Genyan Hao Guang Liu Qiang Zhao Jinping Li 

机构地区：[1]College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,China [2]School of Environment and Energy,South China University of Technology,Guangzhou 51006,China [3]Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Shanghai 200000,China [4]Key Laboratory of Coal Science and Technology,Taiyuan University of Technology,Ministry of Education and Shanxi Province,Taiyuan 030024,China

出　　处：《Nano Research》2022年第1期162-169,共8页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.21878202,21975175,and U1932119);the research project supported by Shanxi Scholarship Council of China(No.2017-041);the Natural Science Foundation of Shanxi Province(No.201801D121052);the National Key Basic Research Program of China(No.2017YFA0403402).

摘　　要：Oxygen evolution reaction(OER)is crucial for hydrogen production as well as other energy storage technologies.CoFe-layered double hydroxide(CoFe-OH)has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous solution.However,it still suffers from low activity in neutral electrolyte.This paper describes partially oxidized CoFe-OH(PO-CoFe-OH)with enhanced covalency of M-O bonds and displays enhanced OER performance under mild condition.Mechanism studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation,providing superior OER performance.It just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm^(-2) in 0.1 M KHCO_(3) aqueous solution(pH=8.3),respectively.It provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.

关 键 词：lattice oxygen oxidation metal-oxygen covalency neutral oxygen evolution reaction 

分 类 号：O64[理学—物理化学]