A Highly Self-healable and Flexible Metal-free Supercapacitor Based on Conductive Hybrid Nanofiller Reinforced Polymer Composite
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In this work, we report a symmetric supercapacitor (SC) with multiple functions fabricated by highly conducting hybrid carbon nanofillers/healable polyurethane composite (HHC) used as metal-free current collector electrodes. The use of two geometrically varied nanofillers with proper selection of their content ratio can induce the formation of an effectively conductive co-supporting network, which drastically enhances the electrical properties and mechanical strength of the HHC compared to their single-filler counterparts. The self-healing of SCs originates from the synergistic recombination among exchange reactions of disulfide bonds and dynamic hydrogen bonds in the polymer matrix across the broken interfaces of the electrodes. As a result, SCs assembled with HHC demonstrate noticeable cycling performance after 20,000 consecutive charge/discharge cycles, high self-healing capability, and outstanding flexibility.