淡江大學機構典藏:Item 987654321/124074
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    題名: Soft x-ray absorption spectroscopic investigation of MnO2/graphene nanocomposites used in supercapacitor
    作者: 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*
    關鍵詞: MnO2;Supercapacitor;X-ray absorption spectroscopy
    日期: 2022-04
    上傳時間: 2023-05-12 12:08:37 (UTC+8)
    出版者: Elsevier Ltd
    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.
    關聯: Catalysis Today 388-389, p.63-69
    DOI: 10.1016/j.cattod.2020.12.030
    顯示於類別:[電機工程學系暨研究所] 期刊論文

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