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Tailoring Oxygen Reduction Reaction Kinetics on Perovskite Oxides via Oxygen Vacancies for Low-Temperature and Knittable Zinc–Air Batteries
Advanced Materials ( IF 29.4 ) Pub Date : 2023-05-29 , DOI: 10.1002/adma.202303109
Hongjiao Huang, Aoming Huang, Di Liu, Wentao Han, Chun-Han Kuo, Han-Yi Chen, Linlin Li, Hui Pan, Shengjie Peng

High kinetics oxygen reduction reaction (ORR) electrocatalysts under low temperature are critical and highly desired for temperature-tolerant energy conversion and storage devices, but remain insufficiently investigated. Herein, oxygen vacancy-rich porous perovskite oxide (CaMnO3) nanofibers coated with reduced graphene oxide coating (V-CMO/rGO) are developed as the air electrode catalyst for low-temperature and knittable Zn–air batteries. V-CMO/rGO exhibits top-level ORR activity among perovskite oxides and shows impressive kinetics under low temperature. Experimental and theoretical calculation results reveal that the synergistic effect between metal atoms and oxygen vacancies, as well as the accelerated kinetics and enhanced electric conductivity and mass transfer over the rGO coated nanofiber 3D network contribute to the enhanced catalytic activity. The desorption of ORR intermediate is promoted by the regulated electron filling. The V-CMO/rGO drives knittable and flexible Zn–air batteries under a low temperature of −40 °C with high peak power density of 56 mW cm−2 and long cycle life of over 80 h. This study provides insight of kinetically active catalyst and facilitates the ZABs application in harsh environment.

中文翻译:

通过氧空位定制钙钛矿氧化物的氧还原反应动力学用于低温和可编织锌空气电池

低温下的高动力学氧还原反应(ORR)电催化剂对于耐温能量转换和存储装置至关重要且非常需要,但研究仍不够充分。在此,开发了涂有还原氧化石墨烯涂层(V-CMO/rGO)的富含氧空位的多孔钙钛矿氧化物(CaMnO 3 )纳米纤维,作为低温可编织锌空气电池的空气电极催化剂。V-CMO/rGO 在钙钛矿氧化物中表现出顶级的 ORR 活性,并在低温下表现出令人印象深刻的动力学。实验和理论计算结果表明,金属原子和氧空位之间的协同效应,以及rGO涂层纳米纤维3D网络上的加速动力学、增强的电导率和传质有助于增强催化活性。受调节的电子填充促进了 ORR 中间体的解吸。V-CMO/rGO在-40°C的低温下驱动可编织的柔性锌空气电池,具有56 mW cm -2的高峰值功率密度和超过80小时的长循环寿命。这项研究提供了对动力学活性催化剂的见解,并促进了 ZAB 在恶劣环境中的应用。
更新日期:2023-05-29
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