Yin Qing, Jia Hongbing, Mohamed Amel, Ji Qingmin, Hong Liu
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanoscale. 2020 Mar 7;12(9):5507-5520. doi: 10.1039/c9nr09272b. Epub 2020 Feb 24.
A key challenge for the fabrication of flexible electrochemical capacitors is to prepare robust electrode materials with excellent integration of high specific capacitances and superior mechanical properties. Aramid nanofibers (ANFs) are emerging candidates for constructing flexible electrode materials due to their superior mechanical properties. However, the present ANF based electrode materials are generally designed by mixing ANFs with electrochemically active components, which results in an unfavorable trade-off in mechanical and electrochemical properties. In this work, we reported flexible, mechanically strong, and free-standing supercapacitor electrodes based on polyaniline (PANI) nanostructure functionalized ANF films for the first time. The flexible PANI@ANF film electrodes achieved an efficient combination of mechanical and electrochemical performance in a single platform with a specific capacitance of 441.0 F g at a current density of 1 A g and a tensile strength of 233.3 MPa, respectively. This kind of free-standing electrode material may have great potential in the development of flexible energy-storage devices. Furthermore, we anticipate that this study may provide insight into the functionalization of aramid nanofiber-based materials for structural energy and power systems with high mechanical performance.
制备柔性电化学电容器的一个关键挑战是制备出具有高比电容和优异机械性能良好整合的坚固电极材料。芳纶纳米纤维（ANF）因其优异的机械性能而成为构建柔性电极材料的新兴候选材料。然而，目前基于ANF的电极材料通常是通过将ANF与电化学活性成分混合来设计的，这导致了机械性能和电化学性能之间不利的权衡。在这项工作中，我们首次报道了基于聚苯胺（PANI）纳米结构功能化ANF薄膜的柔性、机械强度高且自支撑的超级电容器电极。柔性PANI@ANF薄膜电极在单一平台上实现了机械性能和电化学性能的有效结合，在电流密度为1 A g时比电容为441.0 F g，拉伸强度分别为233.3 MPa。这种自支撑电极材料在柔性储能器件的开发中可能具有巨大潜力。此外，我们预计这项研究可能为具有高机械性能的结构能源和动力系统中芳纶纳米纤维基材料的功能化提供见解。
