Preparation method of platinum-manganese alloy catalyst used as cathode of hydrogen fuel cell

The invention discloses a preparation method of a platinum-manganese alloy catalyst used as a cathode of a hydrogen fuel cell, which comprises the following steps: (1) adding platinum salt into aniline, ultrasonically mixing, magnetically stirring at normal temperature, then adding diluted hydrochloric acid, stirring, and finally filtering, washing and drying to obtain a platinum-aniline complex; (2) adding the complex of platinum and aniline, a manganese salt and a carbon carrier into isopropanol, and carrying out ultrasonic dispersion to obtain a suspension; performing rotary evaporation to dryness to obtain a crude product; and (3) carrying out high-temperature heat treatment on the crude product to obtain the platinum-manganese alloy catalyst. According to the prepared platinum-manganese alloy catalyst, manganese can effectively improve the four-electron reaction in the ORR process, reduce the generation of hydrogen peroxide and inhibit the generation of Fenton reaction, and the pyrolytic reaction carried