Revealing electronic state evolution of Co(Ⅱ)/Co(Ⅲ) in CoO(111) plane during OER process through magnetic measurement  

作　　者：Yanjie Li Chaoqun Qu Siqi Meng Jiaqi Hu Ze Gao Hongji Xu Rui Gao Ming Feng 

机构地区：[1]Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China [2]School of Science,Changchun University of Science and Technology,Changchun 130022,China

出　　处：《Chinese Chemical Letters》2025年第3期532-537,共6页中国化学快报(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.52171210);the Program for the Development of Science and Technology of Jilin Province(Nos.20240101004JC,20220201130GX,and 20240402072GH)。

摘　　要：Oxygen evolution reaction(OER) is one of the most important half-reactions related to metal-air batteries,fuel cells, and water-splitting. Due to the sluggish kinetic and multi-electron transfer, catalysts appear to be particularly important for the OER. Knowing the reaction mechanism is fundamental to developing new catalysts and improving OER efficiency. In this work, phase transition and atomic reconstruction on Co O(111) plane were revealed through ex-situ diffraction methods and X-ray absorption spectroscopy.At the same time, the electronic state evolution of Co(Ⅱ)/Co(Ⅲ) during the OER process has also been concluded by analyzing the magnetic properties. This work shows that during the OER process, Co(Ⅲ)experiences surface electron rearrangement from IS(intermediate-spin state) to LS(low-spin state) and then returns to IS/HS(high-spin state) under high voltage region. This work provides a new view to reveal the reaction mechanism through the magnetic property and it can be extended to more magnetic 3d transition metals for future catalyst design.

关 键 词：Oxygen evolution reaction Cobalt oxide Crystal plane Electron spin state X-ray absorption spectrum 

分 类 号：O643.36[理学—物理化学]