NiCo2O4/graphene quantum dots (GQDs) for use in efficient electrochemical energy devices: An electrochemical and X-ray absorption spectroscopic investigation

Han Wei Chang, Ji Xuan Fu, Yu Cheng Huang, Ying Rui Lu, Chun-Hong Kuo, Jeng Lung Chen, Chi Liang Chen, Jyh Fu Lee, Jin Ming Chen, Yu Chen Tsai, Wu-Ching Chou, Chung Li Dong*

*此作品的通信作者

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

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 C[sbnd]O[sbnd]Ni/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.

原文English
頁(從 - 到)290-298
頁數9
期刊Catalysis Today
348
DOIs
出版狀態Published - 15 5月 2020

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