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(Bi_(2)O_(3))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.
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 CO_(2).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(Bi_(2)O_(3)).This work sheds new light on the exploration of novel aqueous metal-air batteries as safe and stable power supply systems.
作者
程翔然
姜怡
屈佳禾
李传发
张琨
张延安
王兵杰
彭慧胜
Xiangran Cheng;Yi Jiang;Jiahe Qu;Chuanfa Li;Kun Zhang;Yanan Zhang;Bingjie Wang;Huisheng Peng(State Key Laboratory of Molecular Engineering of Polymers,Department of Macromolecular Science and Laboratory of Advanced Materials,Fudan University,Shanghai 200438,China)
基金
financially supported by the Science and Technology Commission of Shanghai Municipality(STCSM,21511104900 and 20JC1414902)
the National Natural Science Foundation of China(52222310).
