期刊論文
| 學年 | 110 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2022-04-01 |
| 作品名稱 | Soft x-ray absorption spectroscopic investigation of MnO2/graphene nanocomposites used in supercapacitor |
| 作品名稱（其他語言） | |
| 著者 | H. W. Chang; Yu-Cheng Huang; J. L. Chen; C. L. Chen; J. M. Chen; D. H. Wei; W. C. Chou; C. L. Dong*; Y. C. Tsai* |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Catalysis Today 388-389, p.63-69 |
| 摘要 | Electrochemistry and X-ray absorption spectroscopy (XAS) of MnO2/reduced graphene oxide (RGO) were made to evaluate capacitive performance and electronic structure as a supercapacitor. MnO2 was deposited on the surface of RGO by a spontaneous redox reaction. At low current density (1 A g−1), the specific capacitance of MnO2/RGO (MRGO) greatly increased with increasing growth time from 281 to 462 F g−1. Electrochemical results show that the specific capacitance of RGO and MRGO arises from the combined contributions of electrochemical double-layer capacitance (EDLC) and pseudo-capacitance. To gain insights into the charge storage mechanism of RGO and MRGO, it was characterized using ex-situ soft XAS techniques at Mn L-edge and C, O K-edges in the charging/discharging process. The ex-situ soft XAS results provide evidence that the contribution of RGO to specific capacitance involves an oxygen-functionality-related contribution of pseudocapacitance and EDLC. In addition, the specific capacitance of MRGO reveals pseudocapacitive contributions from the redox processes that involve the Mn(III)/Mn(IV) redox reaction in MnO2. This work utilizes electrochemical and ex-situ XAS techniques to elucidate charge storage mechanism for supercapacitor applications. |
| 關鍵字 | MnO2;Supercapacitor;X-ray absorption spectroscopy |
| 語言 | en_US |
| ISSN | 0920-5861 |
| 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 | GBR |
| 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/987654321/124074 ) |