电沉积法制备石墨烯/MnO<sub>2</sub>纳米复合电极的电容性能

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Abstract The electrode graphene/MnO₂ nano-composites were obtained by depositing a layer of reduced graphene on the porous MnO₂nanoscale which was deposited firstly on the foamed nickel substrate by cyclic voltammetry. The morphology, phase and valence state of the material were analyzed by SEM, XRD and XPS. The specific capacitance, cyclic stability and resistance were characterized by the means of cyclic voltammogram, galvanostatic charge/discharge and electrochemical impedance spectrum. The results show that the MnO₂ nanosheets are mostly coated by graphene. The equivalent series resistance and charge transfer resistance decrease form 0.83 Ω, 9.34 Ω to 0.4 Ω, 6.76 Ω, respeactivly. The specific capacitance of graphene/MnO₂composites at current density of 2 A/g is 501 F/g which has improved 25% compared to bare MnO₂, and exhibit an 84% specific capacitance retention after 3 000 cycles.

Key words： supercapacitor electrodeposition MnO₂ grapheme nanostructure composite electrode

Received: 05 January 2018 Published: 12 July 2019

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	DENG Gao
	HE Hanwei

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DENG Gao,HE Hanwei. Capacitive properties of graphene/MnO₂ nano-composite electrode synthesized by electrodeposition[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 398-406.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I4/398

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