Heterogeneous graphene/polypyrrole multilayered microtube with enhanced capacitance
Heterogeneous graphene/polypyrrole multilayered microtube with enhanced capacitance
复制标题
DOI：
10.1016/j.electacta.2019.03.015
复制
发表时间：
2019-05
影响因子：
6.6
通讯作者：
Junjie Yang;Wei Weng;Yunxia Liang;Yang Zhang;Lijun Yang;Xiaogang Luo;Qian Liu;Meifang Zhu
中科院分区：
文献类型：
--
作者：
Junjie Yang;Wei Weng;Yunxia Liang;Yang Zhang;Lijun Yang;Xiaogang Luo;Qian Liu;Meifang Zhu
纤维型超级电容器具有功率密度高、循环能力强、柔韧性好等优点，是目前比较流行的一种柔性储能装置。然而，纤维结构的有限可变性阻碍了其比电容的进一步增加。在这里，发展了一种简便的电化学沉积方法来制备一种新型的石墨烯/聚吡咯(PPy)多层多层微管。石墨烯/聚吡咯微管具有较高的比电容，是石墨烯微管的3倍。卓越的性能得益于综合优点，例如，更高的导电率，更快的电荷转移和离子扩散，以及更多的聚吡咯储存能量。此外，石墨烯/PPy多层微管的重量比电容几乎超过了所有现有的石墨烯纤维和PPy基纤维，这为纤维形状的超级电容器提供了新的线索。
Fiber-shaped supercapacitor is a prevailing flexible energy storage device due to its high power density, good cyclic ability and excellent flexibility. However, the limited variability of fiber structures hinders its further increase in specific capacitance. Here, a facile electrochemical deposition method is developed to fabricate a novel graphene/polypyrrole (PPy) heterogeneous multilayered microtube. The graphene/PPy microtube possesses an enhanced specific capacitance, which is three times the value of graphene microtube. The superb performance benefits from combined merits, e.g., higher conductivity, faster charge transfer and ion diffusion, and more stored energy by PPy. Moreover, the graphene/PPy multilayered microtube exceeds almost all the available graphene fibers and PPy-based fibers in gravimetric specific capacitance, which sheds new light on fiber-shaped supercapacitors.