教師資料查詢 | 類別: 期刊論文 | 教師: 董崇禮CHUNG-LI DONG (瀏覽個人網頁)

標題:Voltage-and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction
學年108
學期2
出版(發表)日期2020/04/24
作品名稱Voltage-and time-dependent valence state transition in cobalt oxide catalysts during the oxygen evolution reaction
作品名稱(其他語言)
著者J. Zhou; L. Zhang; Y. C. Huang; C. L. Dong; H. J. Lin; C. T. Chen; L. H. Tjeng; Z. Hu
單位
出版者
著錄名稱、卷期、頁數Nature Communications 11, 1-10
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.
關鍵字
語言英文(美國)
ISSN2041-1723
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版
相關連結
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