Abstract We demonstrate a highly efficient Fe/N/C electrocatalyst for oxygen reduction reaction (ORR) which was prepared through MgO template directed approach followed by pyrolysis of iron salt and nitrogen-rich carbon precursors. The Fe/N/C electrocatalyst displays a porous carbon structure with iron atoms, Fe3C nanoparticles and Fe-Nx as active sites which endow the electrocatalyst with plenty of accessible and active sites that are favorable for the enhanced electrocatalytic activity towards ORR. The as-obtained Fe/N/C electrocatalyst exhibits excellent electrocatalytic performance for ORR matching those of the state-of-the-art commercial Pt/C with a higher catalytic activity via a four-electron transfer process, a comparable onset and half-wave potentials, and a peroxide yield lower than 10% in alkaline media. Besides, the Fe/N/C electrocatalyst displays a higher durability and negligible methanol-crossover effect compared with Pt/C electrocatalyst.

中文翻译：

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高效Fe/N/C电催化剂的制备及其在碱性介质氧还原反应中的应用

摘要 我们展示了一种高效的用于氧还原反应 (ORR) 的 Fe/N/C 电催化剂，该催化剂通过 MgO 模板定向方法制备，然后热解铁盐和富氮碳前驱体。Fe/N/C 电催化剂表现出多孔碳结构，以铁原子、Fe3C 纳米颗粒和 Fe-Nx 作为活性位点，为电催化剂提供了大量可接近的活性位点，有利于增强对 ORR 的电催化活性。所获得的 Fe/N/C 电催化剂表现出优异的 ORR 电催化性能，与最先进的商业 Pt/C 相匹配，通过四电子转移过程具有更高的催化活性，可比的起始和半波电位，在碱性介质中过氧化物产率低于 10%。除了，