Developing high‐performance catalysts for oxygen evolution reaction (OER) is critical for the widespread applications of clean and sustainable energy through electrochemical devices such as zinc‐air batteries and (photo)electrochemical water splitting. Constructing heterostructure and oxygen vacancies have demonstrated great promises to boost the OER performance. Herein, we report a facile strategy to fabricate hetero‐structured NiFe₂O₄/Ni₃S₄ nanorods, where NiFe₂O₄ can be derived from Fe‐based metal‐organic frameworks (MOFs). The NiFe₂O₄/Ni₃S₄ catalyst exhibited excellent OER performance, evidenced by an overpotential value of 357 mV at the current density of 20 mA cm⁻², and a small Tafel slope of 87.46 mV dec⁻¹ in 1 M KOH, superior to the benchmark IrO₂ catalyst. Moreover, NiFe₂O₄/Ni₃S₄ outperformed with regard to long‐term durability for OER than IrO₂. Such outstanding OER performance is mainly accounted by the interface between NiFe₂O₄ and Ni₃S₄, and the presence of rich oxygen vacancies. When employed as air‐cathode in zinc‐air batteries, the NiFe₂O₄/Ni₃S₄ decorated battery had a high round‐trip efficiency of 62.1% at 10 h, and possessed long‐term stability of >50 h. This study may pave the way for fabricating non‐noble‐metal‐based cost‐effective, efficient and durable electrocatalysts for OER, zinc‐air batteries, and beyond.

中文翻译：

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异质结构和氧空位促进NiFe2O4 / Ni3S4趋向于氧释放反应和Zn-空气电池。

开发用于氧气析出反应（OER）的高性能催化剂对于清洁和可持续能源通过电化学装置（如锌空气电池和（光）电化学水分解）的广泛应用至关重要。构造异质结构和氧空位已显示出极大的希望来提高OER性能。本文中，我们报道了一种简便的策略来制造异质结构的NiFe ₂ O ₄ / Ni ₃ S ₄纳米棒，其中NiFe ₂ O ₄可以源自铁基金属有机骨架（MOF）。NiFe ₂ O ₄ / Ni ₃ S ₄该催化剂表现出优异的OER性能，这在1 M KOH中的电流密度为20 mA cm ^-2时的过电势值为357 mV ，并且塔菲尔斜率较小，为87.46 mV dec ^-1，优于基准IrO ₂催化剂。此外，就OER的长期耐久性而言，NiFe ₂ O ₄ / Ni ₃ S ₄优于IrO ₂。这种出色的OER性能主要是由于NiFe ₂ O ₄和Ni ₃ S ₄之间的界面以及富氧空位的存在。当用作锌-空气电池的空气阴极时，NiFe ₂O ₄ / Ni ₃ S ₄装饰电池在10 h时具有62.1％的高往返效率，并具有> 50 h的长期稳定性。这项研究可能为制造用于OER，锌-空气电池等的非贵金属，高性价比，高效且耐用的电催化剂铺平道路。