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    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/120670

    題名: NiCo2O4/graphene quantum dots (GQDs) for use in efficient electrochemical energy devices: An electrochemical and X-ray absorption spectroscopic investigation
    作者: Chang, Han-Wei;Fu, Ji-Xuan;Huang, Yu-Cheng;Lu, Ying-Rui;Kuo, Chun-Hong;Chen, Jeng-Lung;Chen, Chi-Liang;Lee, Jyh-Fu;Chene, Jin-Ming;Tsai, Yu-Chen;Chou, Wu Ching;Dong, Chung-Li
    關鍵詞: NiCo2O4;Graphene quantum dots;X-ray absorption spectroscopy
    日期: 2020-05-15
    上傳時間: 2021-04-26 12:11:38 (UTC+8)
    出版者: Elsevier BV
    摘要: NiCo2O4/graphene quantum dots (GQDs) were synthesized by the incorporation of GQDs into NiCo2O4 as electrode materials for use in electrochemical energy devices. The electronic structure and the electrochemical performance of NiCo2O4/GQDs were investigated by X-ray absorption spectroscopy (XAS) and electrochemical measurements. The rich redox active sites were revealed on the NiCo2O4/GQDs, which were formed by the strong Csingle bondOsingle bondNi/Co interaction between NiCo2O4 and GQDs. The synergetic double-layer capacitive and pseudo-capacitive properties were suggested to provide favorable electrochemical characteristics. In/ex situ XAS elucidates local electronic and chemical environments and provides insights into the energy storage/conversion mechanisms. Analytical results demonstrate that the NiCo2O4/GQDs have strong oxygen-carbon bridges and have more Ni active sites than does NiCo2O4, favoring metal-to-ligand charge transfer at the interface between NiCo2O4 and GQDs, critically influencing electrochemical performance. This work contributes importantly to the field by elucidating an energy storage/conversion mechanism for electrochemical energy devices.
    關聯: Catalysis Today 348, p.290-298
    DOI: 10.1016/j.cattod.2019.10.013
    顯示於類別:[電機工程學系暨研究所] 期刊論文


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