It is challenging to explore non-noble metal-based electrocatalysts with high-performance and long-term stability for oxygen evolution reaction (OER). Herein, urchin-like iron-doped nickel cobalt phosphide (FeNiCoP) with hierarchical nanoarray structures and fine-tuned doped Fe content is fabricated through a simple hydrothermal method and subsequent phosphorization process. The optimized FeNiCoP manifests outstanding OER electrocatalytic performance in an alkaline electrolyte with a low overpotential of 259 mV at 10 mA·cm^–2 and a Tafel slope of 40 mV·dec^–1, which is superior to the benchmark IrO₂ and nickel cobalt phosphide (NiCoP) catalysts. The electrochemical activity of NiCoP can be improved by regulating the content of doped Fe. The enhanced catalytic performance of FeNiCoP can be ascribed to the unique urchin-like structure and electronic interaction among Fe, Ni, and Co elements, which expose more active sites, facilitate ion diffusion and gas release, optimize the electronic structure, and thereby enhance OER catalytic performances. Above all, these indicate that the as-prepared FeNiCoP with excellent activity and stability may be a good alternative to commercial precious metal-based catalysts.

中文翻译：

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具有Urchin样结构的铁掺杂镍钴磷化物纳米阵列作为用于氧气析出反应的高性能电催化剂

探索对氧气析出反应（OER）具有高性能和长期稳定性的非贵金属基电催化剂具有挑战性。本文中，通过简单的水热法和随后的磷化工艺，制备了具有分级纳米阵列结构和微调的掺杂铁含量的类顽固型铁掺杂磷化镍镍钴（FeNiCoP）。优化的FeNiCoP在碱性电解液中表现出出色的OER电催化性能，在10 mA·cm ^–2时低过电势为259 mV，Tafel斜率为40 mV·dec ^–1，优于基准IrO ₂和磷化镍钴（NiCoP）催化剂。NiCoP的电化学活性可以通过调节掺杂Fe的含量来提高。FeNiCoP增强的催化性能可以归因于Fe，Ni和Co元素之间独特的顽童状结构和电子相互作用，从而暴露出更多的活性位点，促进离子扩散和气体释放，优化电子结构，从而提高OER催化性能。最重要的是，这些表明所制备的具有优异活性和稳定性的FeNiCoP可能是商业上基于贵金属的催化剂的良好替代品。