One dimensional MnV2O6 nanobelts on graphene as outstanding electrode material for high energy density symmetric supercapacitor

Wei HauLow, Siew SheeLim, Chiu WeeSiong, Chin HuaChia, Poi SimKhiew

Ceramics International, Volume 47, Issue 7, Part A, 1 April 2021, PP 9560-9568

Bimetallic oxide/graphene nanocomposite has been recognised as a promising electrode material owing to its admirable electrochemical activity and excellent electrical conductivity. Herein, a distinctive approach has been applied on exploiting the graphene/MnV₂O₆ nanomaterial as a promising electrode for supercapacitor. In order to achieve fascinating supercapacitive behaviours, an efficient liquid phase exfoliation coupled with solvothermal process is offered to construct these graphene/MnV₂O₆ nanocomposites for symmetric supercapacitor analysis. The hybrid G-8MVO electrode benefited from its optimal graphene/manganese vanadate ratio (1:8), interconnecting network architecture, rich redox activity and superior conducting feature exhibited the maximum specific capacitance of 348 Fg^-1 at 0.5 Ag^-1. Moreover, 88% of its initial capacitance was retained and columbic efficiency of nearly 100% was achieved after 3000 cycles at 1 Ag^-1. Moreover, the symmetric supercapacitor provided a maximum specific energy of 48.33 Wh/kg at specific power of 880.6 W/kg. The comprehensive electrochemical output of the graphene/MnV₂O₆ nanocomposite advocates its potential as a high performance supercapacitor electrode.