Abstract Sluggish oxygen reduction reaction (ORR) kinetics is the biggest obstacle in the development of metal air batteries. High-efficiency ORR catalysts with low cost are in urgent needs. Herein, we propose a robust Fe–N–C ORR catalyst with highly dispersed Fe-Nx active sites on graphitic-N dominated porous carbon. The synchrotron radiation analyses reveal the discrete Fe-Nx coordination derived from the Prussian blue (PB) while the graphitic-N doped porous carbon formed by pyrolysis of the polyaniline (PANI). In virtue of their synergistic catalysis, the tailored Fe–N–C catalyst shows a comparable catalytic activity and a better methanol-tolerance than the commercial Pt/C catalyst. The assembled Zn-Air battery demonstrates a specific capacity of 783 mAh g−1 as well as energy density of 917 Wh kg−1 at 10 mA cm−2, and a maximum power density of 112 mW cm−2 at 191 mA cm−2.

中文翻译：

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石墨-氮为主的多孔碳上高度分散的 Fe-Nx 活性位点用于协同催化氧还原反应

摘要 缓慢的氧还原反应（ORR）动力学是金属空气电池发展的最大障碍。迫切需要低成本的高效ORR催化剂。在此，我们提出了一种坚固的 Fe-N-C ORR 催化剂，在以石墨-N 为主的多孔碳上具有高度分散的 Fe-Nx 活性位点。同步辐射分析揭示了源自普鲁士蓝 (PB) 的离散 Fe-Nx 配位，而由聚苯胺 (PANI) 热解形成的石墨-N 掺杂多孔碳。凭借它们的协同催化作用，定制的 Fe-N-C 催化剂显示出与商业 Pt/C 催化剂相当的催化活性和更好的甲醇耐受性。组装的锌空气电池在 10 mA cm-2 下显示出 783 mAh g-1 的比容量和 917 Wh kg-1 的能量密度，