▎ 摘　　要

NOVELTY - A nitrogen-doped graphene/metal composite electrode preparation method involves adding graphite oxide in alcohol solvent, and stirring to obtain an alcohol solution. The alcohol solution is added with metal salt including magnesium nitrate hexa-hydrate, magnesium sulfate hepta-hydrate, iron (III) nitrate nona-hydrate and/or zinc nitrate hexa-hydrate to obtain a mixed solution. Two metal electrodes are immersed in the mixed solution. A graphene oxide/metal composite electrode is prepared and placed in a container that is placed at 80-150 degrees C to obtain a graphene/metal composite electrode. USE - Method for preparing nitrogen-doped graphene/metal composite electrode. ADVANTAGE - The method enables preparing the electrode with improved stability and electrical conductivity. DETAILED DESCRIPTION - A nitrogen-doped graphene/metal composite electrode preparation method involves adding graphite oxide in alcohol solvent, and ultrasonic stirring for 0.5-2 hours to obtain a uniformly dispersed graphite oxide alcohol solution. The alcohol solution is added with metal salt e.g. magnesium nitrate hexa-hydrate, magnesium sulfate hepta-hydrate, iron (III) nitrate nona-hydrate and zinc nitrate hexa-hydrate, ultrasonic stirred for 15-60 minutes, and uniformly mixed to obtain a mixed solution. Two metal electrodes e.g. nickel foil electrodes, copper foil electrodes and aluminum foil electrodes, are immersed in the mixed solution at direct current voltage of 40-80 V for 5-20 minutes. A negative electrode surface is enriched with the graphene oxide and dried to obtained graphene oxide/metal composite electrode. The composite electrode is placed in a container that is filled with a mixture of ammonia water and water in a volume ratio of 2:1. The container is placed at 80-150 degrees C for 2-4 hours to obtain a nitrogen-doped graphene/metal composite electrode.