用于二次三电极锌空气电池的氧还原催化剂的选择
Selection of oxygen reduction catalysts for secondary tri-electrode zinc-air batteries.
作者信息
Loh Adeline, Trudgeon David P, Li Xiaohong, Liu Mao-Cheng, Kong Ling-Bin, Walsh Frank C
机构信息
Renewable Energy Group, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, UK.
State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China.
出版信息
Sci Rep. 2022 Apr 23;12(1):6696. doi: 10.1038/s41598-022-10671-5.
Oxygen reduction reaction (ORR) electrocatalysts, which are highly efficient, low-cost, yet durable, are important for secondary Zn-air cell applications. ORR activities of single and mixed metal oxide and carbon electrocatalysts were studied using rotating disc electrode (RDE) measurements, Tafel slope and Koutecky-Levich plots. It was found that MnO combined with XC-72R demonstrated high ORR activity and good stability-up to 100 mA cm. The performance of the selected ORR electrode and a previously optimised oxygen evolution reaction (OER) electrode was thereafter tested in a custom-built secondary Zn-air cell in a tri-electrode configuration, and the effects of current density, electrolyte molarity, temperature, and oxygen purity on the performance of the ORR and OER electrode were investigated. Finally, the durability of the secondary Zn-air system was assessed, demonstrating energy efficiencies of 58-61% at 20 mA cm over 40 h in 4 M NaOH + 0.3 M ZnO at 333 K.
氧还原反应（ORR）电催化剂高效、低成本且耐用，对于二次锌空气电池应用至关重要。使用旋转圆盘电极（RDE）测量、塔菲尔斜率和科特基-列维奇图研究了单金属氧化物和混合金属氧化物以及碳电催化剂的ORR活性。发现MnO与XC-72R结合表现出高ORR活性和良好的稳定性，高达100 mA cm。此后，在定制的三电极配置的二次锌空气电池中测试了所选ORR电极和先前优化的析氧反应（OER）电极的性能，并研究了电流密度、电解质摩尔浓度、温度和氧气纯度对ORR和OER电极性能的影响。最后，评估了二次锌空气系统的耐久性，结果表明在333 K下于4 M NaOH + 0.3 M ZnO中，在20 mA cm下经过40 h，能量效率为58 - 61%。
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