▎ 摘　　要

NOVELTY - Preparing carbon-based single-atom catalyst comprises synthesizing sacrificial metal-nitrogen co-doped carbon templates by mixed pyrolysis of sacrificial metal salts with carbon supports and nitrogen-containing compounds and synthesizing target metal-nitrogen co-doped carbon-based single-atom catalysts through the target metal ion exchange coordination in the solution phase. USE - The catalyst is useful in preparing metal catalysts, and fuel cell catalysts. ADVANTAGE - The method is convenient to operate, and has universal applicability.