期刊論文
| 學年 | 108 |
|---|---|
| 學期 | 1 |
| 出版（發表）日期 | 2019-11-14 |
| 作品名稱 | Defects-induced in-plane heterophase in cobalt oxide nanosheets for oxygen evolution reaction |
| 作品名稱（其他語言） | |
| 著者 | Z. Liu; Z. Xiao; G. Luo; R. Chen; C. L. Dong; X. Chen; J. Cen; H. Yang; Y. Wang; D. Su; Y. Li; S. Wang |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Small 15(50), 1904903 |
| 摘要 | Cobalt oxides as efficient oxygen evolution reaction (OER) electrocatalysts have received much attention because of their rich reserves and cheap cost. There are two common cobalt oxides, Co3O4 (spinel phase, stable but poor intrinsic activity) and CoO (rocksalt phase, active but easily be oxidatized). Constructing Co3O4/CoO heterophase can inherit both characteristic features of each component and form a heterophase interface facilitating charge transfer, which is believed to be an effective strategy in designing excellent electrocatalysts. Herein, an atomic arrangement engineering strategy is applied to improve electrocatalytic activity of Co3O4 for the OER. With the presence of oxygen vacancies, cobalt atoms at tetrahedral sites in Co3O4 can more easily diffuse into interstitial octahedral sites to form CoO phase structure as revealed by periodic density functional theory computations. The Co3O4/CoO spinel/rocksalt heterophase can be in situ fabricated at the atomic scale in plane. The overpotential to reach 10 mA cm−2 of Co3O4/CoO is 1.532 V, which is 92 mV smaller than that of Co3O4. Theoretical calculations confirm that the excellent electrochemical activity is corresponding to a decline in average p ‐state energy of adsorbed‐O on the Co3O4/CoO heterophase interface. The reaction Gibbs energy barrier has been significantly decreased with the construction of the heterophase interface. |
| 關鍵字 | atomic arrangement engineering;electrocatalysis;interfacial charge transfer;oxygen evolution reaction;phase evolution |
| 語言 | en |
| ISSN | 1613-6829 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 否 |
| 國別 | DEU |
| 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/987654321/118683 ) |