In situ electrodeposition of polypyrrole onto TaSe2 nanobelts quasi-arrays for high-capacitance supercapacitor
In situ electrodeposition of polypyrrole onto TaSe2 nanobelts quasi-arrays for high-capacitance supercapacitor
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用于高电容超级电容器的 TaSe2 纳米带准阵列上原位电沉积聚吡咯
DOI：
10.1039/c8nr05261a
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Zhu Hongwei
中科院分区：
文献类型：
--
作者：
Wang Min;Zhang Li;Zhong Yujia;Huang Meirong;Zhen Zhen;Zhu Hongwei
过渡金属二硫族化物最近揭示了有趣的物理性质，这导致了在功能器件中有前景的应用。TaSe2作为过渡金属二硫族化合物中的一员，作为一种低维、金属性质的层状电导体而备受关注。本文采用一步表面辅助化学气相输运法在钽箔上直接合成了基于2H-TaSe2纳米带的三维导电准阵列。利用导电准阵列作为衬底，原位电沉积聚吡咯，形成柱状复合纳米结构。结果表明，TaSe2纳米带可以作为导电骨架，提高聚吡咯的导电性和稳定性。该复合材料制成的对称超级电容器在扫描速率为2 mV s−1时具有835 mF cm−2的高面电容，1.2 V的宽电位窗口，并且具有良好的循环稳定性，在10,000次循环后电容保持率为98.7%。同时，超级电容器的组装过程非常简单，因为它不需要任何额外的集流器、粘合剂或导电添加剂。纳米复合材料已被证明是提高聚吡咯电化学性能的有效途径，在超级电容器领域具有广阔的应用前景。
Transition metal dichalcogenides have recently revealed interesting physical properties which lead to promising applications for functional devices. TaSe2, as a member of transition metal dichalcogenides, attracts a great deal of attention as a layered electric conductor with low dimension and metallic nature. Herein, we prepare a three-dimensional conductive quasi-array based on 2H-TaSe2 nanobelts, which are synthesized directly on a tantalum foil by one step surface-assisted chemical vapor transport method. The conductive quasi-arrays are used as substrate for in situ electrodeposition of polypyrrole to form cylinder-like composite nanostructures. It is shown that the TaSe2 nanobelts can improve conductivity and stability of polypyrrole by acting as conductive and robust skeleton. A symmetric supercapacitor constructed from the composites demonstrates high areal capacitance of 835 mF cm−2 at a scan rate of 2 mV s−1, wide potential window of 1.2 V, and excellent cycling stability with 98.7% capacitance retention after 10 000 cycles. Meanwhile, the assembly process of the supercapacitor is quite simple because it does not need any additional current collector, binder or conductive additive. The nanocomposites have been verified to be a very effective way to improve electrochemical performance of polypyrrole, and are promising to be applied as supercapacitors.