Xue Bei, Guo Yao, Huang Zhaofeng, Gu Shengyue, Zhou Qian, Yang Wei, Li Kezhi
Department of Materials Physics, School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121, China.
Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China.
Dalton Trans. 2021 Jul 6;50(26):9088-9102. doi: 10.1039/d1dt01419f.
In this study, a novel NixCo3-xO4 nanotube array hierarchical structure derived from zeolitic imidazolate frameworks (ZIFs) is grown on Ni foam (NixCo3-xO4 NAHS/Ni foam) using the template-assisted and self-assembly approach for a high-performance hybrid energy storage device in alkaline solution. The material characteristics of the resultant samples were characterized by XPS, XRD, ICP, SEM, TEM and BET. Due to the unique hollow structure with a large specific surface area and the exposure of large active sites originating from ZIFs, the optimal NixCo3-xO4 NAHS/Ni foam exhibits substantially enhanced electrochemical properties. The NixCo3-xO4 NAHS/Ni foam directly acts as an electrode, which provides an excellent specific capacity of 290.48 mA h g-1 at 1 A g-1. Subsequently, the corresponding hybrid alkaline batteries that consist of NixCo3-xO4 NAHS/Ni foam and carbon materials display a highly satisfactory specific capacity of 54.94 mA h g-1 at 1 A g-1, a satisfactory long-term stability of 85.47% after 2000 cycles, a maximum energy density of 43.95 W h kg-1 and a power density of 8000 W kg-1. This work combines the design of the electronic structure with the optimization of composition, and provides a reference for the application of hybrid rechargeable alkaline batteries (RABs).
在本研究中，采用模板辅助和自组装方法，在泡沫镍上生长了一种源自沸石咪唑酯骨架（ZIFs）的新型NixCo3-xO4纳米管阵列分级结构（NixCo3-xO4 NAHS/泡沫镍），用于碱性溶液中的高性能混合储能装置。通过XPS、XRD、ICP、SEM、TEM和BET对所得样品的材料特性进行了表征。由于具有大比表面积的独特中空结构以及源自ZIFs的大量活性位点的暴露，优化后的NixCo3-xO4 NAHS/泡沫镍表现出显著增强的电化学性能。NixCo3-xO4 NAHS/泡沫镍直接用作电极，在1 A g-1时提供了290.48 mA h g-1的优异比容量。随后，由NixCo3-xO4 NAHS/泡沫镍和碳材料组成的相应混合碱性电池在1 A g-1时表现出54.94 mA h g-1的高度令人满意的比容量，在2000次循环后具有85.47%的令人满意的长期稳定性，最大能量密度为43.95 W h kg-1，功率密度为8000 W kg-1。这项工作将电子结构设计与成分优化相结合，为混合可充电碱性电池（RABs）的应用提供了参考。
