A self-assemble N-doped graphene and N-doped carbon nanoparticles integrated composite has been prepared by a multi-step acid etching plus annealing method. The formation of N-doped graphene is likely based on a “decomposition and recrystallization” mechanism without the use of any metallic catalyst. The as-prepared integrated composite exhibits efficient catalytic activity for four-electron oxygen reduction reaction.

中文翻译：

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N掺杂石墨烯和碳纳米粒子集成复合材料的形成用于高效氧还原电催化

采用多步酸蚀加退火的方法制备了自组装氮掺杂石墨烯和氮掺杂碳纳米粒子集成复合材料。N掺杂石墨烯的形成可能是基于“分解和再结晶”机制，而不使用任何金属催化剂。所制备的集成复合材料对四电子氧还原反应表现出高效的催化活性。