High-performance yarn electrode materials enhanced by surface modifications of cotton fibers with graphene sheets and polyaniline nanowire arrays for flexible all-solid-state supercapacitors
writer：Chun Jin, Ping Liu, Jia-Nan Zhang, Li-Na Jin, Shao-Wei Bian* and Quan Zhu
keywords：Cotton yarn, Polyaniline, Flexible supercapacitor, Graphene, Fiber
source：期刊
specific source：Electrochim. Acta, 2018, 270, 205-214
Issue time：2018年
A high-performance yarn electrode material, cotton/graphene/polyaniline, is synthesized by coating primary fiber cores inside cotton yarns with graphene sheets and followed by further growing polyaniline nanowire array layers through in situ polymerization of aniline. The electron transportation is enhanced by the 3D graphene conductive network on cotton fibers, which further bridges the polyaniline nanowires. The polyaniline nanowires with small diameters ensure high electrochemically active surface area. The spaces within the polyaniline nanowire array layers and the hierarchical pores of the entire yarn electrode benefit the fast electrolyte ion diffusion. The unique 3D yarn electrode structure results in an excellent electrochemical performance. The maximum areal capacitance and capacitance retention are 246?mF/cm2 at 5?mV/s and 98% after 3800 cycles, respectively. A symmetric all-solid-state yarn supercapacitor is fabricated by using this yarn electrode, which delivers an energy density of 9.7?μWh/cm2 at a power density of 840.9?μW/cm2.