Fabrication and electrochemical capacitance of hierarchical graphene/polyaniline/carbon nanotube ternary composite film
Fabrication and electrochemical capacitance of hierarchical graphene/polyaniline/carbon nanotube ternary composite film
复制标题
分级石墨烯/聚苯胺/碳纳米管三元复合薄膜的制备及电化学电容
DOI：
10.1016/j.electacta.2011.07.142
复制
发表时间：
2011-10-30
影响因子：
6.6
通讯作者：
Zhang, Xiaogang
中科院分区：
文献类型：
--
作者：
Lu, Xiangjun;Dou, Hui;Zhang, Xiaogang
以氧化石墨烯(GO)和聚苯胺(PANI)/碳纳米管(CNT)为复合分散体，采用流动组装法制备了氧化石墨(GO)/聚苯胺/碳纳米管(CNT)前驱体，然后对还原后的PANI进行二次氧化和还原以恢复导电PANI结构，制备了由GN、聚苯胺(PANI)和碳纳米管(CNTs)组成的薄膜。扫描电子显微镜图像表明，三元复合膜为层状结构，共轴的PANI/CNT纳米线均匀地夹在GN片之间。这种具有高电导率的新型层次化结构很好地促进了电解液离子与PANI之间的接触，从而实现了法拉第储能，并有效地利用了电极-电解液界面的双电层电容。在0.1Ag(-1)的电流密度下，通过恒电流充放电测量得到GN/PANI/CNT的比电容为569Fg(-1)，体积电容为188Fg(-3)。此外，GN/PANI/CNT表现出良好的倍率性能(10Ag(-1)下保持60%的容量)和卓越的循环稳定性(5000次连续充放电循环后4%的衰减)。(C)2011爱思唯尔有限公司。保留所有权利。
A film composed of graphene (GN) sheets, polyaniline (PANI) and carbon nanotubes (CNTs) has been fabricated by reducing a graphite oxide (GO)/PANI/CNT precursor prepared by flow-directed assembly from a complex dispersion of GO and PANI/CNT, followed by reoxidation and redoping of the reduced PANI in the composite to restore the conducting PANI structure. Scanning electron microscope images indicate that the ternary composite film is a layered structure with coaxial PANI/CNT nanocables uniformly sandwiched between the GN sheets. Such novel hierarchical structure with high electrical conductivity perfectly facilitates contact between electrolyte ions and PANI for faradaic energy storage and efficiently utilizes the double-layer capacitance at the electrode-electrolyte interfaces. The specific capacitance of the GN/PANI/CNT estimated by galvanostatic charge/discharge measurement is 569 F g(-1) (or 188 Fan(-3) for volumetric capacitance) at a current density of 0.1 A g(-1). In addition, the GN/PANI/CNT exhibits good rate capability (60% capacity retention at 10 A g(-1)) and superior cycling stability (4% fade after 5000 continuous charge/discharge cycles). (C) 2011 Elsevier Ltd. All rights reserved.