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High-performance zeolitic imidazolate frameworks derived three- dimensional Co3S4/polyaniline nanocomposite for supercapacitors
Journal of Energy Storage ( IF 9.4 ) Pub Date : 2021-01-23 , DOI: 10.1016/j.est.2021.102303
Mengni Xu , Hao Guo , Tingting Zhang , Junye Zhang , Xiaoqiong Wang , Wu Yang

The sulfide derived from Zeolitic Imidazolate Frameworks (ZIFs) with conductive polymer has aboundant electroactive sites and more redox reactive centers, which shows great promising for supercapacitors. Here, the composite of ZIF-67 and polyaniline (PANI) is synthesized by simply stirring (ZIF-67/PANI). Among them, PANI serves as a growth substrate of ZIF-67 for transfer scaffold of electrons and works as a wire to connect nanoparticles, making the conductivity of ZIF-67 improved. Furthermore, sulfur is introduced into ZIF-67/PANI by additional sulfurization (Co3S4/PANI). The introduction of sulfur can promote electron transfer for the low electronegativity. The obtained Co3S4/PANI is applied to supercapacitors and at a current density of 1 A•g−1, the specific capacitance is up to 11 times that of the ZIF-67. The assembled asymmetric supercapacitors (ASC) device exhibits a high specific energy of 40.75 Wh•kg−1 at a specific power of 800 W•kg−1 and displays supercycling stability. After 20, 000 cycles of charge and discharge tests, it still can maintain 88% of initial capacitance at a higher current density of 5 A•g−1. Excellent electrochemical performance indicates that the prepared material possesses good market development prospects and is a promising candidate in energy storage fields.



中文翻译:

用于超级电容器的三维Co 3 S 4 /聚苯胺纳米复合材料的高性能沸石咪唑酸酯骨架

来自沸石咪唑酸酯骨架(ZIF)和导电聚合物的硫化物具有丰富的电活性位和更多的氧化还原反应中心,这对超级电容器显示出巨大的希望。在此,ZIF-67和聚苯胺(PANI)的复合物通过简单搅拌(ZIF-67 / PANI)而合成。其中,PANI用作ZIF-67的生长基质,用于电子转移支架,并用作连接纳米颗粒的导线,从而提高了ZIF-67的电导率。此外,通过额外的硫化(Co 3 S 4 / PANI)将硫引入ZIF-67 / PANI 。硫的引入可以促进电子转移,从而降低电负性。获得的Co 3 S 4/ PANI应用于超级电容器,并且在1 A•g -1的电流密度下,比电容高达ZIF-67的11倍。组装的非对称超级电容器(ASC)器件在800 W•kg -1的比功率下显示40.75 Wh•kg -1的高比能,并显示超级循环稳定性。经过20,000个循环的充电和放电测试后,在5 A•g -1的更高电流密度下,它仍可以维持88%的初始电容。优异的电化学性能表明所制备的材料具有良好的市场开发前景,是储能领域的有希望的候选者。

更新日期:2021-01-24
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