Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction

doi:10.1038/s41467-020-15925-2

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction
	Zhou, J ; Zhang, LJ ; Huang, YC ; Dong, CL ; Lin, HJ ; Chen, CT ; Tjeng, LH ; Hu, ZW
刊名	NATURE COMMUNICATIONS
	2020
卷号	11 期号:1 页码:-
关键词	WATER OXIDATION ELECTRONIC-STRUCTURE SURFACE ELECTROCATALYSTS RECONSTRUCTION IDENTIFICATION PEROVSKITES SPECTRA LEVEL
ISSN号	2041-1723
DOI	10.1038/s41467-020-15925-2
文献子类	期刊论文
英文摘要	The ability to determine the electronic structure of catalysts during electrochemical reactions is highly important for identification of the active sites and the reaction mechanism. Here we successfully applied soft X-ray spectroscopy to follow in operando the valence and spin state of the Co ions in Li2Co2O4 under oxygen evolution reaction (OER) conditions. We have observed that a substantial fraction of the Co ions undergo a voltage-dependent and time-dependent valence state transition from Co3+ to Co4+ accompanied by spontaneous delithiation, whereas the edge-shared Co-O network and spin state of the Co ions remain unchanged. Density functional theory calculations indicate that the highly oxidized Co4+ site, rather than the Co3+ site or the oxygen vacancy site, is mainly responsible for the high OER activity. Determining catalyst electronic structures during electrochemical reactions is crucial to understand mechanisms. Here authors perform in operando soft X-ray spectroscopy on a cobalt oxide catalyst during O-2 evolution and observe voltage and time-dependent valence state transitions.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/33266]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30076, Taiwan 3.Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany 4.Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China 5.Tamkang Univ, Dept Phys, 151 Yingzhuan Rd, New Taipei 25137, Taiwan
推荐引用方式 GB/T 7714	Zhou, J,Zhang, LJ,Huang, YC,et al. Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction[J]. NATURE COMMUNICATIONS,2020,11(1):-.
APA	Zhou, J.,Zhang, LJ.,Huang, YC.,Dong, CL.,Lin, HJ.,...&Hu, ZW.(2020).Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction.NATURE COMMUNICATIONS,11(1),-.
MLA	Zhou, J,et al."Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction".NATURE COMMUNICATIONS 11.1(2020):-.