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Flexible fiber-shaped supercapacitor based on nickel-cobalt double hydroxide and pen ink electrodes on metallized carbon fiber.

Research paper by Libo L Gao, Surjadi James SJ Utama, Ke K Cao, Hongti H Zhang, Peifeng P Li, Shang S Xu, Chenchen C Jiang, Jian J Song, Dong D Sun, Yang Y Lu

Indexed on: 25 Jan '17Published on: 25 Jan '17Published in: ACS Applied Materials & Interfaces



Abstract

Flexible fiber-shaped supercapacitors (FSSCs) are recently of extensive interest for portable and wearable electronic gadgets. Yet the lack of industrial-scale flexible fibers with high conductivity and capacitance and low cost greatly limits its practical engineering applications. To this end, we here present pristine twisted carbon fibers (CFs) coated with a thin metallic layer via electroless deposition route, which exhibits exceptional conductivity with ~300% enhancement and superior mechanical strength (~1.8 GPa). Subsequently, the commercial available conductive pen ink modified high conductive composite fibers, on which uniformly covered ultrathin nickel-cobalt double hydroxides (Ni-Co DHs) was introduced to fabricate flexible FSSCs. The synthesized functionalized hierarchical flexible fibers exhibit high specific capacitance up to 1.39 F·cm-2 in KOH aqueous electrolyte. The asymmetric solid-state FSSCs show maximum specific capacitance of 28.67 mF·cm-2 and energy density of 9.57 μWh·cm-2 at corresponding power density as high as 492.17 μW·cm-2 in PVA/KOH gel electrolyte, with demonstrated high flexibility during stretching, demonstrating their potentials in flexible electronic devices and wearable energy systems.