Flexible Fiber-Shaped Supercapacitor Based on Nickel Cobalt Double Hydroxide and Pen Ink Electrodes on Metallized Carbon Fiber

摘要

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,similar to 300% enhancement And superior mechanical strength (similar to 1.8 GPa): Subsequently, the commercially available:conductive pen ink modified high conductive composite fibers, on which uniformly covered ultrathin nickelcobalt double hydroxide's (Ni-Co DHs) were introduced to fabricate flexible FSSCs. The synthesized fuottionalized hierarchical flexible fibers exhibit high specific capacitance up to 1.39 F center dot cm(-2) in KOH aqueous electrolyte. The asymmetric solid-state FSSCs show maximum specific capacitance of 28.67 mF center dot cm(-2) and energy density of 9.57 mu Wh center dot cm(-2) at corresponding power density as high as 492.17 mu W center dot cm(-2) in PVA/KOH gel electrolyte, with demonstrated high flexibility: during stretching, demonstrating their potential in flexible electronic devices and wearable energy systems.