Abstract
Aqueous metal-air batteries own the merits of high theoretical energy density and high safety, but suffer from electrochemical irreversibility of metal anodes (e.g., Zn, Fe, Al, and Mg) and chemical instability of alkaline electrolytes to atmospheric CO2. Here, we firstly design a rechargeable bismuth (Bi)-air battery using the non-alkaline bismuth triflate (Bi(OTf)3) aqueous electrolyte. Benefitting from the three-electron reaction and the high potential of +0.32 V vs. standard hydrogen electrode, the Bi metal anode delivers a high capacity of 383 mA h g−1 and good stability for 1000 cycles with a Coulombic efficiency of 99.6% in the Bi(OTf)3 electrolyte, without corrosion, passivation and hydrogen evolution reaction. Furthermore, the non-alkaline Bi-air battery achieves long-term operation stability (>200 h) in ambient air with the reversible formation/decomposition of bismuth trioxide (Bi2O3). This work sheds new light on the exploration of novel aqueous metal-air batteries as safe and stable power supply systems.
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摘要
水系金属空气电池具有理论能量密度高、安全性高等优点, 但 受限于金属阳极(如锌、铁、铝、镁)的电化学不可逆性以及碱性电解 质对大气中二氧化碳的化学不稳定性. 本工作首次设计了一种可充电 的铋-空气电池, 该电池使用了非碱性的三氟甲磺酸铋(Bi(OTf)3)水系 电解质. 得益于三电子反应和相对于标准氢电极+0.32 V的高电位, 铋 金属负极具有383 mA h g−1的高比容量和1000次循环的良好稳定性, 以 及99.6%高库仑效率. 铋金属负极在Bi(OTf)3电解液中无腐蚀、钝化和 析氢等副反应. 此外, 非碱性的铋-空气电池通过三氧化二铋(Bi2O3)的 可逆形成/分解, 在环境空气中实现了长期运行稳定性(>200 h). 这项工 作为探索新型水系金属空气电池作为安全稳定的电源系统提供了新 思路.
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Acknowledgements
This work was financially supported by the Science and Technology Commission of Shanghai Municipality (STCSM, 21511104900 and 20JC1414902) and the National Natural Science Foundation of China (52222310).
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Author contributions Cheng X performed most experiments and characterizations and prepared the manuscript. Cheng X, Wang B, and Peng H discussed the results and co-wrote the manuscript. Jiang Y, Qu J, Li C, Zhang K and Zhang Y assisted in some experimental measurements and manuscript correction. All authors contributed to the general discussion.
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**angran Cheng is currently a PhD student at the Department of Macromolecular Science, Fudan University. She received her BS degree in chemical engineering from Dalian University of Technology in 2019. Her work focuses on electrode materials, metal-air batteries, and their applications in flexible energy storage systems.
Bingjie Wang is an associate professor at the Laboratory of Advanced Materials, Fudan University. He received his BE degree in polymer materials and engineering from Sichuan University in 2009, and a PhD degree from Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences in 2014. His research centers on flexible energy storage devices.
Huisheng Peng is currently a university professor at the Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University. He received his BE degree in polymer materials from Donghua University in 1999, his MS degree in macromolecular chemistry and physics from Fudan University in 2003, and his PhD degree in chemical engineering from Tulane University in the USA in 2006. He then worked at Los Alamos National Laboratory before joining Fudan University in 2008. He focuses on the new direction of fiber electronics.
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Cheng, X., Jiang, Y., Qu, J. et al. A novel rechargeable aqueous bismuth-air battery. Sci. China Mater. 66, 4615–4621 (2023). https://doi.org/10.1007/s40843-023-2630-1
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DOI: https://doi.org/10.1007/s40843-023-2630-1