Multidimensional Hierarchical Fabric-based Supercapacitor With Bionic Fiber Micro-arrays for Smart Wearable Electronic Textiles.

Flexible textile-based supercapacitors (SCs) have attracted numerous attentions with the rapid development of the artificial intelligent technology and smart wearable electronic textiles. However, energy storage performance of common textile-based SCs are always restricted with the low dimensional substrates (i.e., one-dimensional fibers or two-dimensional fabrics), so flexible textile-based SCs with multifarious hierarchical substrates are highly desired. Herein, a multidimensional hierarchical fabric electrode model with a bionic fiber micro-array structure has been designed, inspired by the "grasp effect" of the sophisticated arrangement structures of hedgehog spines. And the bionic assembled SCs exhibit enhanced specific areal capacitance of 245.5 mF/cm2 at 1 mV/cm2, high energy density 21.82 μWh/cm2 at 0.4 mW/cm2 compared with planar fabric-based SCs (41.6 mF/cm2). Besides, the SCs also maintain a stable capacitance ratio of 83.9% after 10000 cycles and merely capacitance loss under different bending states. As a proof of the concept, an all-fabric smart electronic switch is fabricated with self-power and wearable properties, along with some other trial applications. Such hierarchical fabric with the bionic fiber micro-array structure is believed to enhance the performance of the assembled SCs. And we foresee that the multidimensional hierarchical fabric would bring broader application prospects for flexible energy storage devices and smart wearable electronic textiles. Keywords: Smart Textiles, Flexible textile-based supercapacitors, Multidimensional hierarchical fabric, Bionic fiber micro-array structure, High specific capacitance.