层状MnO<sub>2</sub>纳米带的插层质子化及其与氧化石墨烯复合材料的电化学性能

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Abstract K⁺ intercalated-MnO₂ nanomaterials were synthesized by using KMnO₄ and MnCl₂ as redox in KOH solution, placed at 200 ℃ for 48h, then protonated with ammonium persulfate. In addition, layered MnO₂/graphene oxide (GO) composites were prepared by using graphene oxide aqueous solution as solvent. The phase and morphology of the prepared materials were characterized by XRD, SEM, etc. The electrochemical performance of the supercapacitor was tested by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) in 1 M KOH solution. The results show that the K⁺ intercalated MnO₂ has the morphology of nanobelts, its length can reach 5-12 μm, and its width is about 500 nm. After protonation, high crystallinity and nanobelt morphology can be maintained. In addition, the electrochemical properties of MnO₂ can be significantly improved by the addition of GO. The specific capacitance of layered MnO₂ nanobelts/GO composites is as high as 750 F/g at current density of 0.5 A/g.

Key words： layered MnO₂ nanobelts graphene oxide supercapacitors electrochemical property

Received: 17 May 2019 Published: 19 June 2020

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	JIA Lulu
	YANG Baopeng

Cite this article:

JIA Lulu,YANG Baopeng. Protonation of layered MnO₂ nanobelts and GO/MnO₂ composites and their electrochemical properties[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 491-497.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I6/491

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