期刊論文
| 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 ) |