The carbon paper (CP) heat-treated at 435°C for 10 h were characterized by FTIR spectroscopy and BET, and their electrochemical behaviors were investigated by cyclic voltammograms, impedance spectroscopy and charge-discharge techniques. The results show that -COOH functional groups form after heat-treated for 10 h and specific surface area increases significantly. The vanadium redox battery with modified CP electrode exhibits excellent performance at current density of 50 mA/cm2. The average current efficiency reaches 95% and average voltage efficiency reaches 89%. The improvement of elect...
