▎ 摘　　要

NOVELTY - Preparing a platinum-nickel catalyst gas diffusion electrode, comprises placing the gas diffusion layer electrode in the electrolyte for electro-deposition and then calcining to obtain the final product, where the gas diffusion layer electrode is prepared by (1) dispersing the conductive material and polymer in the ethanol to obtain the dispersion liquid, and (2) coating the dispersion liquid on the nickel net and then calcining to obtain the product. In the step (1), the conductive material comprises acetylene black, graphite graphene, carbon nano tube and MXenes. The polymer is perfluorosulfonic acid or polytetrafluoroethylene. The nickel salt comprises nickel sulfate, nickel nitrate, nickel acetate, nickel acetylacetonate and/or nickel chloride. USE - The electrode is useful in increasing the yield of hydrogen peroxide and removing malachite green in water (claimed). ADVANTAGE - The electrode: has high catalytic activity and stability; solves the problem of slow dynamics of 2e electrochemical oxygen reduction reaction under the neutral condition; reduce the use amount of noble metal; improves the yield of the hydrogen peroxide; and can remove the harmful substances e.g. malachite green in water body. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a platinum-nickel catalyst gas diffusion electrode prepared by the above mentioned method.