Developing highly efficient and earth‐abundant electrocatalysts for the oxygen evolution reaction (OER) is critical in overall water splitting technology. Among all transition‐metal‐based materials, NiFe‐based electrocatalysts have been regarded as the most promising substitute to commercial noble metals in alkaline conditions. To overcome their leaching problem and improve intrinsic stability without compromising activity, we report a NiFe alloy covered with a discrete N‐doped graphitic shell for the OER. The alloy core@discrete graphitic shell structure exhibits enhanced OER activity and stability with a low onset potential of 1.48 V, reduced overpotential of 320 mV@10 mA cm⁻¹, and small Tafel slope value of 41 mV dec⁻¹, which is superior to Ir/C. It is believed that the nitrogen doping, a discrete graphitic shell, and a mesoporous structure work in harmony to enhance the OER performance.

中文翻译：

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核/壳NiFe纳米合金，带有离散的N掺杂石墨碳盖，可增强水氧化能力

开发用于氧气释放反应（OER）的高效且富于地球的电催化剂对于整体水分解技术至关重要。在所有过渡金属基材料中，镍铁基电催化剂被认为是碱性条件下商业上贵金属的最有希望的替代品。为了克服它们的浸提问题并在不损害活性的情况下提高其固有稳定性，我们报道了一种用于OER的分立的N掺杂石墨壳覆盖的NiFe合金。合金核@离散石墨壳结构具有增强的OER活性和稳定性，具有1.48 V的低起始电势，320 mV @ 10 mA cm ^-1的降低的过电势和41 mV dec ^-1的小Tafel斜率值，它优于Ir / C。据信氮掺杂，离散的石墨壳和中孔结构和谐地工作以提高OER性能。