▎ 摘　　要

NOVELTY - Preparing graphene modified electrode comprises e.g. (i) transferring the pre-treated carbon-based material to vacuum preparation chamber, turning on vacuum pump, vacuumizing, introducing hydrogen at flow rate of 450-500 sccm, cleaning for 2-3 minutes, then adjusting hydrogen gas flow to 90-120 sccm, (ii) turning on heating power of vacuum preparation chamber for 100-120 minutes, raising temperature to 800-950 ℃, (iii) passing olefin gas at flow rate of 10-60 sccm, turning on plasma radio frequency power supply after pressure of vacuum preparation chamber reaches 40-42 Pa for 4-8 minutes as intermittent time, carrying out plasma deposition of graphene nanosheets for 3-15 times, and (iv) when deposition is over, stop feeding olefin gas, plasma deposition of graphene nanosheets, heating, adjusting hydrogen gas flow to 60-80 sccm, making pressure of vacuum preparation chamber 20-22 Pa, and naturally cooling to room temperature. USE - The graphene modified electrode is useful for multiple liquid flow battery system (claimed). ADVANTAGE - The method enables to prepare graphene modified electrode which has high conductivity, large specific surface area, excellent stability, and improved catalytic performance and stability. DETAILED DESCRIPTION - Preparing graphene modified electrode comprises (i) transferring the pre-treated carbon-based material to vacuum preparation chamber, turning on vacuum pump, vacuumizing to make vacuum degree in preparation chamber is lower than 5 Pa until indoor pressure is stable, introducing hydrogen at flow rate of 450-500 sccm, cleaning for 2-3 minutes, then adjusting hydrogen gas flow to 90-120 sccm, vacuum preparation room pressure reaches 30-32 Pa, (ii) turning on heating power of vacuum preparation chamber for 100-120 minutes, raising temperature to 800-950 ℃, (iii) passing olefin gas at flow rate of 10-60 sccm, turning on plasma radio frequency power supply after pressure of vacuum preparation chamber reaches 40-42 Pa for 4-8 minutes as intermittent time, carrying out plasma deposition of graphene nanosheets for 3-15 times, and (iv) when deposition is over, stop feeding olefin gas, plasma deposition of graphene nanosheets, heating, adjusting hydrogen gas flow to 60-80 sccm, making pressure of vacuum preparation chamber 20-22 Pa, and naturally cooling to room temperature. An INDEPENDENT CLAIM is also included for graphene modified electrode obtained by above method.