Effect of electrode surface treatment on carbon fiber based structural supercapacitors: Electrochemical analysis, mechanical performance and proof-of-concept

• DOI: 10.1016/j.est.2022.106599
• Publication Date: 2023-01-05T19:15:34Z
• Authors: Joaquín Artigas-A...; Xoan F. Sánchez-R...; María Sánchez; Alejandro Ureña
• Keywords: Carbon fibers

Supercapacitors based on carbon fiber reinforced polymer (CFRPs) were studied and the influence of surface treatment mechanical electrochemical properties was explored. Electrodes prepared by deposition graphene nanoplatelets (GNPs) combined with different binders (PVDF PVA) onto a fabric. A significant decrease in Interlaminar Shear Strength (ILSS) is observed when comparing solid electrolyte to structural resin (around 50 %). Moreover, addition any binder promotes ILSS due lower interfacial 20 % compared GNP-coated condition). Electrochemical impedance spectroscopy (EIS) analysis proves that capacitor can be fitted an equivalent circuit consisting R-CPE series elements. An increase bulk resistance using (29.7 22.7 kΩ) GNP-only-coated (10.2 kΩ). For this reason, supercapacitor best one specific capacitance coulombic efficiency, calculated Galvanostatic charge-discharge (GCD), 5.2 mF/g, showing also high stability over time. Energy storage capability successfully demonstrated proof concept powering LED after short charge time device.