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The potential window plays an important role in the performance of a supercapacitor and the gel polymer electrolyte (GPE) is the widespread interest in this context. GP electrolytes have high ionic conductivity, excellent electrochemical stability, and suitable ion transfer. So, in this work, the porous poly(acrylonitrile-polyhedral oligomeric silsesquioxane) (P(A-POS)) membrane electrolyte has been proposed for the metal oxide-based supercapacitors. The porous membrane was synthesized via the phase inversion process and after the liquid organic electrolyte uptake, it was used as GPE in Co3O4 nanoribbon/activated carbon asymmetric supercapacitor. The positive electrode based on Co3O4 nanoribbon (NR-Co3O4) offered a high specific capacitance of 2380.4 mF cm−2 at a current density of 2 mA cm−2 and the organic liquid electrolyte uptake of (P(A-POS)) membrane was 405%. The results indicated that the supercapacitor with NR-Co3O4 positive electrode and (P(A-POS)) porous membrane shows wide potential window of 4 V and low charge transfer resistance of 1.1 Ω in a solid-state asymmetric supercapacitor.

In this work, we have synthesized a flexible ZnO@C foam for its potential applications in energy production and storage devices based on the simple and versatile method. The fabricated ZnO@C foam exhibited enhanced capacitance compared to commercially available Ni foam. The fabrication process involves the synthesis of ZnO nanostructures, deposition of ZnO@C nanostructure on Ni foam, and finally, removing Ni substrate to have ZnO@C foam. Based on cyclic voltammetry, galvanostatic charge-discharge curves and electrochemical impedance spectroscopy, it was concluded that the ZnO@C foam has a suitable electron transfer rate and conductivity. ZnO@C foam provides a high areal specific capacitance of 1120 mF cm−2 at a current density of 4 mA cm−2. The proposed flexible foam has potential applications in the fabrication of solid-state supercapacitors as well as fuel cells. Keywords: ZnO@C foam, Flexible, Energy storage devices, Supercapacitor