Abstract
Constructing electrode materials with large capacity and good conductivity is an effective approach to improve the capacitor performance of asymmetric supercapacitors (ASCs). In this paper, ZnCo2S4 core–shell nanospheres are constructed by two-step hydrothermal method. In order to improve the chemical activity of ZnCo2S4, ZnCo2S4 is activated using cetyltrimethylammonium bromide (CTAB). Then, MXene nanosheets are fixed on the surface of ZnCo2S4 by electrostatic self-assembly method to improve the specific surface area of ZnCo2S4 and MXene-wrapped ZnCo2S4 composite is prepared in this work. Owing to the synergy effect between MXene nanosheets and ZnCo2S4 core–shell nanospheres, the as-prepared composite displays fast ion transfer rate and charge/discharge process. The capacity of the MXene-wrapped ZnCo2S4 composite can reach 1072 F·g−1, which is far larger than that of ZnCo2S4 (407 F·g−1) at 1 A·g−1. An ASC device is assembled, which delivers 1.7 V potential window and superior cyclic stability (95.41% capacitance retention). Furthermore, energy density of this device is up to 30.46 Wh·kg−1 at a power density of 850 W·kg−1. The above results demonstrate that MXene-wrapped ZnCo2S4 composite has great application prospects in electrochemical energy storage field.
Graphical abstract
摘要
构建具有大容量和良好导电性的电极材料是提高非对称超级电容器 (ASCs) 电容器性能的有效途径。在本文中, ZnCo2S4 核壳纳米球是通过两步水热法合成的。为了提高 ZnCo2S4 的化学活性, 使用十六烷基三甲基溴化铵 (CTAB) 活化 ZnCo2S4。然后, 通过静电自组装方法将MXene纳米片固定在ZnCo2S4表面, 提高了ZnCo2S4的比表面积, 获得了MXene包裹的ZnCo2S4结构。由于 MXene 纳米片和 ZnCo2S4 核壳纳米球之间的协同作用, 所制备的复合材料显示出快速的离子转移速率和充放电过程。 MXene包裹的ZnCo2S4复合材料的容量可以达到1072 F g−1, 远大于1 A g−1时的ZnCo2S4 (407 F g−1)。并组装了一个 ASC 设备, 它可以提供 1.7 V 的电位窗口和卓越的循环稳定性 (95.41% 的电容保持率)。此外, 该设备的能量密度高达 30.46 Wh kg−1, 功率密度为 850 W kg−1。以上结果表明MXene包裹的ZnCo2S4复合材料在电化学储能领域具有广阔的应用前景。
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This study was financially supported by the Fundamental Research Funds for the Central Universities (No. 2019XKQYMS16).
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Qi, JQ., Zhang, CC., Liu, H. et al. MXene-wrapped ZnCo2S4 core–shell nanospheres via electrostatic self-assembly as positive electrode materials for asymmetric supercapacitors. Rare Met. 41, 2633–2644 (2022). https://doi.org/10.1007/s12598-021-01956-1
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DOI: https://doi.org/10.1007/s12598-021-01956-1