▎ 摘　　要

NOVELTY - Preparing platinum/cobalt acid manganese nanocrystalline/nitrogen doped graphene three-dimensional composite electrode catalyst involves preparing graphene oxide dispersion, adding cobalt salt, manganese salt and ammonia to graphene oxide dispersion, and stirring to prepare manganese cobalt acid/nitrogen-doped graphene precursor solution, where added amount of the graphene oxide and manganese cobalt acid is mass ratio is 1-20:1-20, and addition amount of nitrogen element and graphene oxide in ammonia water is 1:1-100. The manganese cobalt acid/nitrogen-doped graphene precursor solution is subjected to hydrothermal reaction to obtain hydrogel-like product, which is dialyzed and washed with water, and freeze-dried to obtain three-dimensional manganese cobalt acid nanocrystals/nitrogen-doped graphene. USE - Method for preparing platinum/cobalt acid manganese nanocrystalline/nitrogen-doped graphene three-dimensional composite electrode catalyst. ADVANTAGE - The method enables to prepare platinum/cobalt acid manganese nanocrystalline/nitrogen doped graphene three-dimensional composite electrode catalyst which has large specific surface area, multiple active sites, good circulation stability and excellent catalytic performance. DETAILED DESCRIPTION - Preparing platinum/cobalt acid manganese nanocrystalline/nitrogen doped graphene three-dimensional composite electrode catalyst involves preparing graphene oxide dispersion, adding cobalt salt, manganese salt and ammonia to graphene oxide dispersion, and stirring to prepare manganese cobalt acid/nitrogen-doped graphene precursor solution, where added amount of the graphene oxide and manganese cobalt acid is mass ratio is 1-20:1-20, and addition amount of nitrogen element and graphene oxide in ammonia water is 1:1-100. The manganese cobalt acid/nitrogen-doped graphene precursor solution is subjected to hydrothermal reaction to obtain hydrogel-like product, which is dialyzed and washed with water, and freeze-dried to obtain three-dimensional manganese cobalt acid nanocrystals/nitrogen-doped graphene. A platinum salt solution is added to manganese cobalt acid nanocrystals/nitrogen-doped graphene, hydrothermal reaction is performed, centrifuged and washed, and freeze-dried to obtain platinum/manganese cobalt acid nanocrystals/nitrogen-doped graphene three-dimensional in composite electrode catalyst, where addition amount of binary composite of platinum and manganese cobalt acid nanocrystals/nitrogen-doped graphene in platinum salt is 1:1-20 in terms of mass ratio.