Highly Flexible and Mechanically Strong Polyaniline Nanostructure @ Aramid Nanofiber Films for Free-standing Supercapacitor Electrodes
A key challenge for 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 its superior mechanical properties. However, present ANFs based electrode materials are generally designed by mixing ANFs with electrochemical 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 ANFs film for the first time. The flexible PANI@ANFs film electrode achieved the efficient combination of mechanical and electrochemical performance in a single platform with specific capacitance of 441.0 F g-1 at a current density of 1 A g-1 and 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 bring insight on the functionalization of aramid nanofiber-based materials for structural energy and power systems with high mechanical performance.