Abstract Development of non-noble metal catalysts for oxygen reduction reaction (ORR) is of significant importance for the commercialization of fuel cells and metal-air batteries. Here we provide an efficient method to produce core-shell structured Fe N C catalyst via a facile in-situ chelating strategy by introducing ammonia iron citrate during the polymerization process of dopamine. The influence of calcination temperature and atmosphere on the physicochemical property and the activity of the catalyst are systematically evaluated. By calcination at 800 °C with NH3 atmosphere, Fe2N encapsulated with N doped carbon layers shows excellent activity with close onset and half wave potential (E1/2) while better methanol crossover resistance than the Pt/C catalyst. The high activity could be due to the synergistic effect of Fe2N with the N-doped graphitic carbon layers and the mesoporous structure facilitating the mass transfer. Moreover, the simple synthesis process could provide a versatile routine to construct core-shell structured metal-N C composite for a wild catalytic application.

中文翻译：

---

轻松合成 N 掺杂碳层封装 Fe 2 N 作为氧还原反应的有效催化剂

摘要 开发用于氧还原反应（ORR）的非贵金属催化剂对于燃料电池和金属空气电池的商业化具有重要意义。在这里，我们提供了一种有效的方法，通过在多巴胺聚合过程中引入柠檬酸铁铵，通过简便的原位螯合策略生产核壳结构的 Fe NC 催化剂。系统评价了煅烧温度和气氛对催化剂理化性质和活性的影响。通过在 NH3 气氛下在 800°C 下煅烧，用 N 掺杂的碳层封装的 Fe2N 显示出优异的活性，具有接近的起始和半波电位 (E1/2)，同时比 Pt/C 催化剂更好的耐甲醇穿越性。高活性可能是由于 Fe2N 与 N 掺杂的石墨碳层和促进传质的介孔结构的协同作用。此外，简单的合成过程可以提供一种通用的方法来构建核壳结构的金属-N C 复合材料，用于野生催化应用。