Facile synthesis of V4+-doped and graphene-decorated V2O5/biomass carbon nanocomposite using graphene quantum dot for supercapacitors with wide voltage window and high energy density

This study reports a strategy for synthesis of V 4+ -doped and graphene-decorated V 2 O 2 /biomass carbon nanocomposite using graphene quantum dot. The introduction of graphene quantum dots and cotton significantly improves the supercapacitor performance.