▎ 摘　　要

NOVELTY - Preparation of heteroatom defect-rich graphene-modified electrode involves immersing a carbon felt in an acid solution for 8-10 hours, taking out the carbon felt, cleaning, ultrasonically processing, placing obtained pretreated carbon felt as a cathode and a graphite plate as a anode in an inert metal salt solution to form an electrolytic cell, electrolyzing, cleaning obtained product, ultrasonically processing, drying, placing obtained carbon felt wrapped with the dense metal film on the surface of the carbon fiber in a preparation chamber of a high-vacuum graphene preparation system, introducing hydrogen, heating, introducing methane, heating, naturally cooling, taking out obtained graphene-modified carbon felt, immersing the graphene-modified carbon felt in a ferric chloride solution, cleaning, drying, cutting obtained chemically etched graphene-modified carbon felt into electrode size, placing in a plasma treatment chamber, and performing radio frequency plasma etching. USE - Preparation of heteroatom defect-rich graphene-modified electrode used in liquid flow battery system (all claimed) e.g. redox flow battery. ADVANTAGE - The modified electrode has high conductivity, large specific surface area, good catalytic performance, good stability, and improved electrochemical performance of the liquid flow battery electrode. DETAILED DESCRIPTION - Preparation of heteroatom defect-rich graphene-modified electrode involves immersing a carbon felt in an acid solution for 8-10 hours, taking out the carbon felt, cleaning, ultrasonically processing to obtain pretreated carbon felt, placing the pretreated carbon felt as a cathode and a graphite plate as an anode in an inert metal salt solution to form an electrolytic cell under the action of an external electric field, electrolyzing for 300-500 seconds, cleaning obtained product, ultrasonically processing, drying to obtain a carbon felt with dense metal film wrapped on the surface of carbon fiber, placing the carbon felt wrapped with the dense metal film on the surface of the carbon fiber in a preparation chamber of a high-vacuum graphene preparation system under vacuum conditions, introducing hydrogen with a flow rate of 40-60 sccm, heating to 855-865℃, introducing methane with a flow rate of 30 sccm, adjusting hydrogen flow rate to 60-80 sccm, heating to 895-905℃, heat-preserving for 5-15 minutes, adjusting methane flow rate to 20 sccm, heating to 995-1005℃, heat-preserving for 5-15 minutes, adjusting methane flow rate to 10 sccm, heating to 1095-1105℃, heat-preserving for 5-15 minutes, stopping introduction of methane, adjusting hydrogen flow rate to 40-60 sccm, naturally cooling to room temperature, stopping introduction of hydrogen, taking out obtained graphene-modified carbon felt, immersing the graphene-modified carbon felt in a ferric chloride solution for 45-60 minutes, cleaning obtained product, drying to obtain chemically etched graphene-modified carbon felt, cutting the chemically etched graphene-modified carbon felt into electrode size, placing in a plasma treatment chamber at room temperature, performing radio frequency plasma etching under an argon gas atmosphere with argon gas flow rate of 15-30sccm at radio frequency power of 200-300 W for 60-300 seconds, introducing reactive gas at flow rate of 10-20 sccm, and performing radio frequency plasma etching in the reactive gas atmosphere at radio frequency power of 300-400 W for 30-600 seconds. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram explaining preparation of the heteroatom defect-rich graphene-modified electrode. (Drawing includes non-English language text)