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

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.

Keywords:

• Graphene hydrogel
• flower-like MnO₂
• supercapacitors