Fiber-shaped all-solid-state symmetric supercapacitors based on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)/carbonized zeolitic imidazolate framework-8

Abstract

Fiber-shaped supercapacitors (FSCs) have lately attracted interest due to their tiny size, great flexibility, and the prospect of application in wearable devices. Among the FSCs, those based on poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) (PFs) are particularly promising due to their outstanding electrochemical and mechanical properties. However, the areal capacitance and cycling stability of these materials are still far below the practical requirement. In this study, zeolitic imidazolate framework-8 (ZIF-8) is utilized to prepare nitrogen-doped porous carbon (c-ZIF-8), which is then integrated into PFs by a hybrid spinning method. Because of its ultra-high specific surface area (1633.1 m2 g−1) and abundant pores, c-ZIF-8 provides more electrochemically active sites and remarkably increases the capacitance of the composite fibers. They exhibit a high specific capacitance of 635 mF cm−2 and excellent cycling stability in 10,000 cycles.