▎ 摘　　要

NOVELTY - A manganese dioxide supported nitrogen-sulfur double-doped graphene catalyst is prepared by two-step hydrothermal synthesis method using nitrogen-sulfur co-doped reduced graphene oxide, manganese chloride tetrahydrate and potassium permanganate in mass ratio of 1:7.5-10:5-20. The loading of various valence manganese compounds to increase the electrocatalytic activity of the catalyst. The catalyst is nitrogen-sulfur doped manganese compound, where heteroatom nitrogen and sulfur are doped to increase graphene defects and disorder. The catalyst has peak current density of 5.72 mA/cm2, accurate oxygen reduction reaction peak at -0.52 V and excellent oxygen reduction activity. USE - Manganese dioxide supported nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction in aluminum-air fuel cell (claimed). ADVANTAGE - The graphene catalyst has excellent oxygen reduction activity. The preparation method of catalyst is carried out under mild reaction condition, is simple and feasible, and reduces the cost of fuel cell. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the manganese dioxide supported nitrogen-sulfur double-doped graphene catalyst, which involves using graphite oxide stock solution comprising graphene oxide and organic solvent in mass ratio of 1:10-20, reducing agent, manganese chloride tetrahydrate, potassium permanganate and ultrapure water; (2) characterization method of the manganese dioxide supported nitrogen-sulfur double-doped graphene catalyst, which involves performing scanning electron microscope analysis, X-ray diffraction analysis, and Brunauer-Emmett-Teller and catalyst performance evaluation method; and (3) aluminum-air fuel cell, which comprises pure aluminum as anode, manganese dioxide supported nitrogen-sulfur double-doped graphene air electrode as cathode and electrolyte comprising 4 mol/L sodium hydroxide solution containing corrosion inhibitor. The graphene air electrode is prepared by mixing the manganese dioxide supported nitrogen-sulfur double-doped graphene catalyst, conductive carbon black, 60 %mass PTFE binder and N-methylpyrrolidone into mixture, coating mixture on the surface of nickel mesh and hot pressing.