Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction
Voltage- and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction
复制标题
氧化钴催化剂在析氧反应过程中电压和时间依赖性的价态转变
DOI：
10.1038/s41467-020-15925-2
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发表时间：
2020-04
影响因子：
16.6
通讯作者：
Hu Zhiwei
中科院分区：
文献类型：
--
作者：
Zhou Jing;Zhang Linjuan;Huang Yu-Cheng;Dong Chung-Li;Lin Hong-Ji;Chen Chien-Te;Tjeng L. H.;Hu Zhiwei
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.
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影响因子：
3.7
作者：
Burnus, T.;Hu, Z.;Tjeng, L. H.
通讯作者：
Tjeng, L. H.
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
熔盐合成多孔La0.6Sr0.4Co0.2Fe0.8O2.9钙钛矿作为高效析氧电催化剂
影响因子：
9.9
作者：
Song Sanzhao;Zhou Jing;Zhang Shuo;Zhang Linjuan;Li Jiong;Wang Yu;Han Ling;Long Youwen;Hu Zhiwei;Wang Jian-Qiang
通讯作者：
Wang Jian-Qiang
影响因子：
16.5
作者：
Sanzhao Song;Jing Zhou;Jian Sun;Shiyu Zhang;Xiao Lin;Zhiwei Hu;Jun Hu;Lin-juan Zhang;
通讯作者：
Sanzhao Song;Jing Zhou;Jian Sun;Shiyu Zhang;Xiao Lin;Zhiwei Hu;Jun Hu;Lin-juan Zhang;
影响因子：
19
作者：
Fominykh, Ksenia;Tok, Guelen Ceren;Fattakhova-Rohlfing, Dina
通讯作者：
Fattakhova-Rohlfing, Dina