Highly Flexible and Tailorable Cobalt‐Doped Cross‐Linked Polyacrylamide‐Based Electrolytes for Use in High‐Performance Supercapacitors. Issue 11 (29th April 2021)

• Record Type: Journal Article
• Authors: Gunday, Seyda Tugba; Qahtan, Talal; Cevik, Emre; Anil, Ismail; Alagha, Omar; Bozkurt, Ayhan
• Is Part Of: Chemistry, an Asian journal. Volume 16:Issue 11(2021)
• Page Start: 1438
• Page End: 1444
• Publication Date: 2021-04-29
• Subjects: Redox-active electrolyte -- PAM -- BG -- supercapacitor -- cross-linked polymer; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.202100276
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: A novel hydrogel polymer electrolyte was prepared by incorporation of 1, 4‐butanediol diglycidyl ether (BG) to cross‐linked polyacrylamide (PAM). The electrolyte (PAMBG) was modified with cobalt (II) sulfate with various doping ratios (PAMBGCoX) to increase the capacitance by increasing faradaic reactions. The supercapacitor device assembly was performed by using active carbon (AC) electrodes and hydrogel polymer electrolytes. The specific capacitance of the PAMBGCo5 device indicated 130 F g −1, which is at least a seven‐fold improvement due to the insertion of Co as a redox component. The electrolyte device, PAMBGCo5, displays superior performance having an energy density of 38 Wh kg −1 at a power density of 500 W kg −1 . Additionally, with the same hydrogel, the device performed 10, 000 galvanostatic charge‐discharge cycles via retaining 91% of the initial capacitance. A cost‐effective electrolyte, PAMBGCo5, was tested in a carbon‐based supercapacitor under bent and twisted conditions at various angles, confirming the robustness of the device. Abstract : Flexible supercapacitor devices consisting of new hydrogel polymer electrolytes have been successfully produced. The device delivered a maximum energy density of 38 Wh kg −1 at a power density of 500 W kg −1 . The cyclic charge‐discharge performance of 91% was maintained after 10, 000 GCD measurements at 1 A g −1 .