Flexible solid-state supercapacitor of metal-organic framework coated on carbon nanotube film interconnected by electrochemically - codeposited PEDOT-GO

In this study, zirconium-based metal organic framework (MOF) (UiO-66) has been synthesized and coated on carbon nanotube film (CNTF) (noted as U-C), the following is electrochemically codeposited poly(3,4-ethylenedioxythiophene)-graphene oxide (PEDOT-GO) on U-C to obtain a flexible porous electrode (PEDOT- GO/U-C). The electrochemical measurements including cyclic voltammetry, impedance spectroscopy and galvanostatic charge/discharge have been performed. Electrochemical studies show that the PEDOT-GO/U-C electrode exhibits an exceptionally areal capacitance of 102 mF cm(-2) at 10 mV s(-1) than that of PEDOT/U-C electrode (89 mF cm(-2)) with a three-electrode system, indicating the existence of GO in the composites effectively improve the capacitive performance of PEDOT/U-C. Moreover, there is a synergistic effect between UiO-66, PEDOT and GO sheets. A device of PEDOT-GO/U-C has also been assembled and tested. The optimum device shows the energy and power densities of 0.0022 mWh cm(-2) and 0.2 mW cm(-2) at the current density of 0.4 mA cm(-2). The device exhibits the excellent flexible properties under different curvature conditions.