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. In this study, zirconium‐based metal organic framework (MOF) (UiO‐66) was synthesized and coated on carbon nanotube film (CNTF, noted as U−C). Poly(3,4‐ethylenedioxythiophene)‐graphene oxide (PEDOT‐GO) was then electrochemically codeposited on U−C to obtain a flexible porous electrode (PEDOT‐GO/U−C). PEDOT‐GO/U−C has excellent properties for flexible supercapacitors.