Microwave‐Induced Rapid Synthesis of High‐EntropyOxide/Carbon Nanotube Composites for High‐Performance Bifunctional Oxygen Catalysis in Zinc–Air Batteries

The fabrication of efficient, low‐cost, and stable bifunctional oxygen catalysts is crucial for zinc–air batteries (ZABs). High‐entropy materials have emerged to possess great potential as oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) bifunctional catalysts for ZABs, but its efficient synthesis with superior activity remains challenging. Herein, a rapid and facile microwave‐induced carbon thermal shock technique was developed to efficiently synthesize high‐entropy oxide (HEO) nanoparticles, i.e., (FeCoNiCrMn) ₃ O ₄ , that are uniformly anchored onto carbon nanotubes (CNT), denoted as (FeCoNiCrMn) ₃ O ₄ /CNT. The obtained (FeCoNiCrMn) ₃ O ₄ /CNT can work as a bifunctional catalyst, exhibiting excellent performance with the OER overpotential of 273 mV at 10 mA cm ⁻² and the ORR half‐wave potential of 0.771 V. Moreover, the ZAB assembled with (FeCoNiCrMn) ₃ O ₄ /CNT as the cathode demonstrates superior performance, with high specific capacity (828.8 mAh g _Zn ⁻¹ ), energy density (986.3 Wh kg _Zn ⁻¹ ), and outstanding long‐term durability exceeding 500 h. This work offers a scalable strategy in efficient construction of CNT‐supported HEO nanomaterials, thus facilitating the development of high‐efficiency electrocatalysts for practical ZAB applications.