Nitrogen-doped carbon self-supported NiFeCo phosphide bifunctional electrocatalysts for rechargeable zinc-air batteries

The development of efficient transition metal-based electrocatalysts is a prerequisite for use in OER and ORR, as well as for zinc-air batteries. However, it is still a great challenge to prepare durable and efficient electrocatalysts. In this part, in this paper, a composite (NiFeCo-P@NC) with bifunctional activity and relatively excellent battery performance was successfully designed and constructed by combining transition metal carbon matrix composites with low-temperature solid-phase phosphatisation. After electrochemical performance tests, we found that the material has excellent OER activity with eta 10 of 298 mV, which is better than commercial RuO2 (340 mV). In addition, NiFeCo-P@NC also showed satisfactory performance in the ORR test. It also exhibited excellent cycling stability (123h) when assembled into ZABs, while its power density was as high as 147.7 mW cm- 2, which was much larger than that of commercial Pt/C + RuO2 catalysts (108.1 mW cm- 2).