Meng-Di Hao, Qin Li, Jing-Han Sun, Deng Liu, Hua-Long Yu, Rui Liu
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Polyphenol-metal coordination derived high-entropy alloy as bifunctional oxygen electrocatalyst for Zn-air batteries
High-entropy alloy (HEA) nanoparticles (NPs) have attracted great attention in electrocatalysis due to their tailorable complex compositions and unique properties. Herein, we introduce Fe, Co, Ni, Cr and Mn into the metal-polyphenol coordination system to prepare HEA NPs enclosed in N-doped carbon (FeCoNiCrMn) with great potential for catalyzing oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The unique high-entropy structural characteristics in FeCoNiCrMn facilitate effective interplay between metal species, leading to improved ORR (E1/2 = 0.89 V) and OER (η = 330 mV, j = 10 mA·cm−2) activity. Additionally, FeCoNiCrMn exhibits excellent open-circuit voltage (1.523 V), power density (110 mW·cm−2) and long-term durability, outperforming Pt/C + IrO2 electrodes as a cathode catalyst in Zn-air batteries (ZABs). Such polyphenol-assisted alloying method broadens and simplifies the development of HEA electrocatalysts for high-performance ZABs.
期刊介绍：
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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