Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction  

作　　者：Zhichao Jia Yang Yuan Yanxing Zhang Xiang Lyu Chenhong Liu Xiaoli Yang Zhengyu Bai Haijiang Wang Lin Yang 

机构地区：[1]Key Laboratory of Green Chemical Media and Reactions,School of Chemistry and Chemical Engineering,Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals,Ministry of Education,Henan Normal University,Xinxiang,Henan,China [2]School of Physics,Henan Normal University,Xinxiang,Henan,China [3]Oak Ridge National Laboratory,Electrification and Energy Infrastructures Division,Oak Ridge,Tennessee,USA [4]Department of Mechanical and Energy Engineering,Key Laboratory of Energy Conversion and Storage Technologies,Southern University of Science and Technology,Shenzhen,Guangdong,China

出　　处：《Carbon Energy》2024年第1期236-244,共9页碳能源（英文）

基　　金：The National Natural Science Foundation of China(Grant Nos.52072114 and 51922008);the 111 Project(Grant No.D17007),the Henan Center for Outstanding Overseas Scientists(Grant No.GZS2018003);Xinxiang Major Science and Technology Projects(Grant No.21ZD001);Guangdong Innovative and Entrepreneurial Research Team Program(2016ZT06N500);Guangdong Provincial Key Laboratory of Energy Materials for Electric Power(2018B030322001)all provided financial support for this work.

摘　　要：Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions(OERs).Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts.Herein,Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mAcm−2.Additionally,it had an overpotential of 260 mV(glassy carbon)or 215 mV(nickel foam),which was 78 mV lower than that of IrO_(2)(338 mV).In situ,Raman spectroscopy revealed the transformation process of CoOOH.Calculations using the density functional theory showed that during OER,doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process,which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER overpotentials.Our research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.

关 键 词：ELECTROCATALYST in situ Raman Mo-doped CoOOH oxygen evolution reaction 

分 类 号：TQ116.1[化学工程—无机化工] TQ426