▎ 摘　　要

NOVELTY - A graphitized carbon layer coated transition metal nanoparticle catalyst comprises carbon substrate, porous carbon network and core-shell structured nanoparticles. The core is transition metal nanoparticles. The shell is graphitized carbon layer. The core-shell structured nanoparticles are fixed on carbon substrate through porous carbon network. USE - The graphitized carbon layer coated transition metal nanoparticle catalyst is used for zinc-air batteries and fuel cells (all claimed). ADVANTAGE - The catalyst has high metal loading amount, small particle size and uniform distribution, and excellent oxygen reduction and oxygen evolution reaction catalytic performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the graphitized carbon layer coated transition metal nanoparticle catalyst comprising preparing metal hydroxide arrays using precipitating agent and metal salt solution, pre-growing on carbon substrate to form metal source in the heat treatment process, coating with high molecular polymer through polymerization reaction, high-temperature heating under inert atmosphere, and cooling.