A facile strategy is developed to create a MIL-88A/Ni(OH)2 heterostructure, where the interfacial charge transfer significantly boosted the OER performance.
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 NiFe 2 O 4 /Ni 3 S 4 nanorods, where NiFe 2 O 4 can be derived from Fe-based metalorganic frameworks (MOFs). The NiFe 2 O 4 /Ni 3 S 4 catalyst exhibited excellent OER performance, evidenced by an overpotential value of 357 mV at the current density of 20 mA cm À 2 , and a small Tafel slope of 87.46 mV dec À 1 in 1 M KOH, superior to the benchmark IrO 2 catalyst. Moreover, NiFe 2 O 4 /Ni 3 S 4 outperformed with regard to long-term durability for OER than IrO 2. Such outstanding OER performance is mainly accounted by the interface between NiFe 2 O 4 and Ni 3 S 4 , and the presence of rich oxygen vacancies. When employed as air-cathode in zinc-air batteries, the NiFe 2 O 4 / Ni 3 S 4 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-noblemetal-based cost-effective, efficient and durable electrocatalysts for OER, zinc-air batteries, and beyond.
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