Lv Heng, Wang Jiali, Gao Xinyu, Wang Yongwen, Shen Yunfei, Liu Ping, Wang Gang, Chen Long, Gu Tiantian
Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, 832003 Xinjiang, China.
ACS Appl Mater Interfaces. 2023 Oct 11;15(40):47094-47102. doi: 10.1021/acsami.3c10552. Epub 2023 Sep 28.
Widespread interest has been generated by aqueous zinc batteries (AZIBs), which have excellent theoretical capacities (820 mA h g), a low redox potential (-0.76 V vs SHE of Zn metal), and high security. Suitable cathodes for constructing high performance AZIBs are of great signification. Metal-organic frameworks (MOFs) with adjustable structure via metals and organic units show great potential in AZIBs. In this work, ZnMn-Squaric acid (ZnMn-SQ) was synthesized using squaric acid through coprecipitation and served as the cathode for AZIBs. The ZnMn-SQ electrode demonstrated a high capacity of 489.1 mA h g at 0.2 A g. Meanwhile, ZnMn-SQ can obtain 80.7 mA h g after 1300 cycles, showing an outstanding long cycle life. More importantly, ex situ characterizations of XRD, XPS, and FT-IR revealed that ZnMn-SQ undergoes a structural transformation from the initial ZnMn-SQ framework to manganese oxide accompanied by Zn-SQ and then reduced to MnOOH, ZnMnO, and ZnSO(OH)·5HO (ZHS) in subsequent cycles. In addition, a modified zinc anode using cubic porous Zn-SQ-3d was used to construct ZnMn-SQ // Zn-SQ-3d@Zn(Zn-SQ-3d-coated Zn) high performance AZIBs, the capacity of which reaches 171.3 mA h g at 1 A g after 660 cycles. This work provided chances for constructing high-performance zinc ion batteries using MOF compounds.
水系锌电池（AZIBs）引发了广泛关注，这类电池具有出色的理论容量（820 mA h g）、较低的氧化还原电位（相对于锌金属标准氢电极 -0.76 V）以及高安全性。构建高性能水系锌电池的合适阴极具有重要意义。通过金属和有机单元可调节结构的金属有机框架（MOFs）在水系锌电池中显示出巨大潜力。在这项工作中，利用方酸通过共沉淀法合成了ZnMn - 方酸（ZnMn - SQ），并将其用作水系锌电池的阴极。ZnMn - SQ电极在0.2 A g电流密度下展现出489.1 mA h g的高容量。同时，ZnMn - SQ在1300次循环后仍可获得80.7 mA h g的容量，显示出出色的长循环寿命。更重要的是，XRD、XPS和FT - IR的非原位表征表明，ZnMn - SQ经历了从初始的ZnMn - SQ框架到伴随Zn - SQ的氧化锰的结构转变，随后在后续循环中还原为MnOOH、ZnMnO和ZnSO(OH)·5H₂O（ZHS）。此外，使用立方多孔Zn - SQ - 3d修饰的锌阳极构建了ZnMn - SQ // Zn - SQ - 3d@Zn（涂覆有Zn - SQ - 3d的Zn）高性能水系锌电池，其在1 A g电流密度下经过660次循环后容量达到171.3 mA h g。这项工作为使用MOF化合物构建高性能锌离子电池提供了契机。
