Abstract
Constructing heterogeneous interfaces between transition metal alloys and oxides in a carbon-based composite catalyst is an effective strategy for boosting the oxygen evolution reaction and oxygen reduction reaction (OER and ORR). Inspired by this concept, a carbon-coated MnCoNi alloy/oxide catalyst (Ox-MnCoNi-C) was synthesized by carbonization of metal–organic frameworks (MOFs) and controllable reoxidation process. Owing to the synergetic interaction between abundant active sites on the heterogeneous interface and the good electron transfer rate of graphitic carbon, Ox-MnCoNi-C exhibits a low potential gap (ΔE) of 0.79 V. Meanwhile, the assembled liquid zinc–air batteries exhibit high power density (125 mW cm–2), superior primary discharge specific capacity (822 mAh gZn–1), and no less than 100 h of steady charging and discharging operation running at 5 mA cm–2. This approach will provide a generic template for the preparation and extension of MOF-derived carbon composite catalysts applied in oxygen electrocatalysis.
Published Version
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