In situ polymerized Ti3C2Tx/PDA electrode with superior areal capacitance for supercapacitors
In situ polymerized Ti3C2Tx/PDA electrode with superior areal capacitance for supercapacitors
复制标题
原位聚合 Ti3C2TX/PDA 电极具有优异的面积电容，适用于超级电容器
DOI：
10.1016/j.jallcom.2018.11.172
复制
发表时间：
2019-03-25
影响因子：
6.2
通讯作者：
Zhang, Xitian
中科院分区：
文献类型：
--
作者：
Wang, Heru;Li, Lu;Zhang, Xitian
为了解决Ti3C2Tx纳米片在循环过程中的堆积和电极微结构的破坏，获得高性能的超级电容器电极，采用多巴胺在Ti3C2Tx纳米片表面一步原位聚合的方法，设计并成功制备了Ti3C2Tx/PDA复合膜电极。合成的Ti3C2Tx/PDA复合电极在2 mV/S的扫描速度下获得了715mF/cm2的面电容，10000次循环后保持了95.5%的初始比容量，表现出长期的循环稳定性。当负载量增加到13.6 mg/cm(2)时，其面积电容可提高到3440 mF/cm(2)。PDA的引入有效地抑制了Ti3C2Tx片层的再堆积，增加了层间距，有利于暴露更多的表面活性中心，缩短电解液离子的扩散路径，促进电子传递和快速法拉第反应，从而提高了材料的电化学性能和电化学稳定性。我们的工作为开发高性能负极材料开辟了新的设计空间。(C)2018爱思唯尔B.V.保留所有权利。
To solve the restacking of the Ti3C2Tx nanosheets and destroy of electrode microstructure during cycles and gain high-performance electrode for supercapacitors, Ti3C2Tx/PDA composite film electrode was rationally designed and successfully synthesized by one-step in situ polymerization of dopamine on the surface of the Ti3C2Tx nanosheets. The as-synthesized Ti3C2Tx/PDA composite electrode achieved a superior areal capacitance of 715 mF/cm(2) at a scan rate of 2 mV/s and maintained 95.5% of initial capacitance after 10000 cycles, exhibiting long-term cycling stability. The areal capacitance can be enhanced to 3440 mF/cm(2) when the mass loading increases to 13.6 mg/cm(2). The improved electrochemical performance and outstanding electrochemical stability can be attributed to the effective suppressing the restacking of Ti3C2Tx sheets and increasing interlayer spacing by introducing PDA, which could be beneficial to expose more surface active sites, shorten the diffusion path of electrolyte ions, promote electron transport and fast Faradaic reaction. Our work opens new design space to develop the high performance negative electrode materials. (C) 2018 Elsevier B.V. All rights reserved.