MnO2 grafted V2O5 nanostructures: formation mechanism, morphology and supercapacitive features

Abstract

This article details an approach for the fabrication of MnO₂ grafted V₂O₅ nanostructures to function as supercapacitor electrode. The MnO₂ and V₂O₅ combined to form profitable hierarchical network morphology. Most importantly, both MnO₂ and V₂O₅ contributed to energy storage. This type of synergetic architecture exhibits elevated specific capacitance (450 F g⁻¹ at 0.5 A g⁻¹), good rate capacity (251 F g⁻¹ at 5 A g⁻¹) and provides better cycling stability (retaining 89% of capacitance after 500 cycles). An asymmetric supercapacitor using MnO₂ grafted V₂O₅ and activated carbon (AC) as electrodes was assembled. It exhibits a specific capacitance of 61 F g⁻¹ with an energy density of 8.5 Wh kg⁻¹. The electrochemical feature of MnO₂ grafted V₂O₅ nanostructure can be useful for the fabrication of high performance supercapacitor systems.