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 en_US
ISSN 2041-1723
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/120726 )

SDGS 氣候行動,可負擔的潔淨能源