Electrochemical Comparison of 2D-Flexible Solid-State Supercapacitors Based on a Matrix of PVA/H[sub.3]PO[sub.4]

• Published in: Polymers 2023-10, Vol.15 (20)
• Main Authors: Muñoz, Bianca K, González-Banciella, Andrés, Ureña, Daniel, Sánchez, María, Ureña, Alejandro
• Format: Article
• Language: English
• Subjects: Batteries; Capacitors; Electrochemistry
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym15204036

Different modifications of woven carbon fiber (WCF) based on carbon aerogel (CAG), copper oxide nanoparticles (CuO-NPs), and lignin (LIG) has been tested and used to study their effect on the fabrication and performance of a flexible supercapacitor. New symmetric flexible supercapacitors (SFSCs) were fabricated using different separators. According to the electrochemical results, the device fabricated using CAG and woven glass fiber (WGF) in a sandwich type configuration CAG/WGF/CAG embedded in H[sub.3]PO[sub.4]/PVA exhibited the best performance (1.4 F/g, 0.961 W/kg, 0.161 Wh/kg). A proof of concept based on a LED powered on and a bending test was done, and the capacitor demonstrated excellent electrochemical values even during and after bending. The new device was able to recover 96.12% of its capacitance when returned to its original unbent position. The manufacturing process was critical, as the fibers or layers must be completely embedded in the gel electrolyte to function effectively. A double flexible supercapacitor connected in parallel was fabricated and it showed higher stability, in the same voltage window, yielding 311 mF/cm[sup.2] of areal capacitance.