Carbon felt supported carbon nanotubes catalysts composite electrode for vanadium redox flow battery application

▸ A carbon felt (CF) supported carbon nanotubes (CNTs) catalysts composite electrode has been developed. ▸ The composite electrode improve the reversibility of the VO2+/VO2+ and V3+/V2+ redox couples greatly. ▸ The CNTs can be stabilized on the CF evenly and strongly by Nafion which is stable in vanadium solution. ▸ The VRFB single cell with the modified CF with MWCNTs content of 0.94 wt.% exhibits excellent performance.