Juan Li, Bing Li, Pei-Tong Li, Ning Zhang, Hui-Shan Shang
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引用次数: 0
摘要
高效、经济的双功能氧电催化剂的缺乏严重阻碍了高性能金属-空气电池的实际应用。在此，我们采用简便的溶胶-凝胶策略，构建了一种高效的双功能氧电催化剂 ZnFeNiCoCr 高熵合金（HEA）纳米粒子，用于氧进化反应（OER）和氧还原反应（ORR）。由于金属元素之间的协同效应，合成的 ZnFeNiCoCr HEA 具有优异的双功能特性。在 10 mA-cm-2 条件下，OER 的过电位为 305 mV，ORR 的半波电位为 0.864 V，与商业化的 RuO2 和 Pt/C 相比表现优异。因此，ZnFeNiCoCr HEA 可用作锌-空气电池的阴极催化剂。基于这种 HEA 的锌-空气电池的比容量为 743 mAh-g-1，电池可连续充放电超过 400 小时。
A ZnFeNiCoCr high-entropy alloy for efficient bifunctional oxygen electrocatalysis
The dearth of efficacious and economic bifunctional oxygen electrocatalysts has constituted a significant impediment to the actual implementation of high-performance metal-air batteries. Here, we construct an efficacious bifunctional oxygen electrocatalyst ZnFeNiCoCr high-entropy alloy (HEA) nanoparticles for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) using a facile sol–gel strategy. The synthesized ZnFeNiCoCr HEA exhibits excellent bifunctional properties due to the synergistic effect between the metal elements. The overpotential of 305 mV at 10 mA·cm−2 for OER and a half-wave potential of 0.864 V for ORR, which is excellent to that of commercial RuO2 and Pt/C. Consequently, ZnFeNiCoCr HEA is utilized as a cathode catalyst for zinc-air batteries. The specific capacity of a zinc-air battery based on this HEA is 743 mAh·g−1 and the battery undergoes a continuous charge/discharge cycle for over 400 h. The ZnFeNiCoCr HEA catalyst holds significant application potential in diverse electrochemical energy storage and conversion devices.
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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