rGO/NiCo复合材料制备及电化学性能研究

doi:10.11896/cldb.22030311

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Abstract Supercapacitors are considered as ideal energy storage devices due to their high energy density and high power density, which can effectively solve the energy problem to a certain extent. Electrode materials have a decisive influence on the performance of supercapacitors, and transition metals with high theoretical specific capacitance are the focus of research. Nickel-cobalt bimetallic oxides have high energy storage efficiency, but high internal resistance leads to poor rate performance. Based on this, rGO@Ni_xCo_y nanocomposites were successfully synthesized by simple hydrothermal method, and the morphologic structure of the material was adjusted by constantly adjusting the relative proportion of nickel and cobalt elements to find the best proportion. Among all the nanocomposites, rGO/NiCo nanocomposites show excellent specific capacitance of 600 F/g at 0.5 A/g, and the rGO/NiCo∥rGO flexible device has specific capacitance of 418.2 F/g and energy density of 98 Wh/kg with a power density of 1 300 W/kg. Maintaining a specific capacitance of 93% after 8 000 charge-discharge cycles, the solid-state flexible device can operate efficiently in a wide range of voltage windows. Excellent electrochemical performance predicts its application in flexible supercapacitor devices.

Key words： rGO nickel-cobalt bimetallic oxide morphological control supercapacitor

Published: 25 September 2023 Online: 2023-09-18

CLC number:

TB33

Fund:Natural Science Foundation of Guangxi Province (2020GXNSFAA159015).

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	YAN Dongxian
	FAN Xin

Cite this article:

YAN Dongxian,FAN Xin. Preparation and Electrochemical Performance of rGO/NiCo Composites[J]. Materials Reports, 2023, 37(18): 22030311-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22030311 OR http://www.mater-rep.com/EN/Y2023/V37/I18/22030311

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