▎ 摘　　要

The electrochemical properties of graphene make it an attractive material for use in a range of devices. We herein describe the simple preparation of graphene-modified graphite (GMG) composite electrodes by hybridization with graphite for all-vanadium redox flow batteries (VRB). The cyclic voltammetry (CV) results revealed that the use of GMG composite electrodes with an optimal graphene loading content (3 wt%) allowed remarkable improvements in terms of both the reversibility and the current density, which was up to 30% higher than that of the pristine graphite electrode, and that an electrode of this type shows considerable potential for use in VRBs.