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Articles

In-situ Growth of Flower-Like MnO2/Graphene Hydrogel Mesoporous Electrode Material for Supercapacitors

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Pages 87-95 | Received 08 Nov 2019, Accepted 03 Feb 2020, Published online: 07 Apr 2020
 

Abstract

A simple and environmentally friendly route is developed to produce flower-like MnO2/graphene hydrogel (MnO2/GH) composites with mesoporous structure. The results show that flower-like MnO2 is firmly adhered to the surface and interior of GH. Compared with pure MnO2 and GH, the electrode of MnO2/GH composites exhibits high specific capacitance of 293.7 F/g at 0.5 A/g, and over 87.3% of capacitance has maintained after cycling 2000 times. The excellent electrical conductivity is basically attributed to the large specific surface, the stability microstructure and good conditions for ion-diffusion and ion-transport by MnO2/GH composites.

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