▎ 摘　　要

NOVELTY - A preparation method of carbon-supported platinum-tin nanocatalyst of long-life proton exchange membrane fuel cell, involves providing tin precursor solution and carbon-supported platinum nanocatalyst, and mixing the tin precursor solution and the carbon-supported platinum nanocatalyst to obtain dispersion liquid, and drying the dispersion liquid to obtain carbon-supported platinum-tin precursor powder, and heating the carbon-supported platinum-tin precursor powder under the reducing gas to obtain a nanocatalyst, where the nanocatalyst comprises a carbon carrier, platinum nano-particles loaded on the carbon carrier, and tin atoms modified on a surface of the platinum nano-particles, and the atomic ratio of platinum and tin in the carbon-supported platinum-tin nanocatalyst is 10:1-50:1. USE - Preparation method of carbon-supported platinum-tin nanocatalyst of long-life proton exchange membrane fuel cell. ADVANTAGE - The long-life proton exchange membrane fuel cell carbon-supported platinum-tin nanocatalyst has excellent stability under the oxygen reduction reaction condition of the fuel cell that 0.6-1.2 V cycle scanning for 20,000 times, the mass activity decay is less than 30%, the electrochemical active area attenuationis less than 30%, and the area falloff is less than 20%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a long-life proton exchange membrane fuel cell carbon-supported platinum-tin nanocatalyst, which comprises a carbon carrier, platinum nano-particles loaded on the carbon carrier, and tin atoms modified on the surface of the platinum nano-particles, where the atomic ratio of platinum and tin in the carbon-supported platinum-tin nanocatalyst is 10:1-50:1.