Introducing oxygen vacancy (V) has been considered as an effective and significant method to accelerate the sluggish electrocatalytic nitrogen reduction reaction (NRR). In this work, a series of bimetallic zeolitic imidazolate frameworks based on ZIF-67 and ZIF-8 with varied ratios of Co/Zn have been applied as precursors to prepare V-rich Zn-doped CoO nanopolyhedrons (Zn-CoO) by a low-temperature oxidation strategy. Zn-CoO presents an ammonia yield of 22.71 μg h mg with a high faradaic efficiency of 11.9% for NRR under ambient conditions. The remarkable catalytic performances are believed to result from the plentiful V as the Lewis acid sites and electron-rich Co sites to promote the adsorption and dissociation of N molecules. Remarkably, Zn-CoO also demonstrates a high electrochemical stability. This work presents a guiding method for developing a stable and efficient electrocatalyst for the NRR.
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