Performance of PEDOTOH/PEO‐based Supercapacitors in Agarose Gel Electrolyte. Issue 17 (12th July 2022)

• Record Type: Journal Article
• Authors: Wustoni, Shofarul; Nikiforidis, Georgios; Ohayon, David; Inal, Sahika; Indartono, Yuli Setyo; Suendo, Veinardi; Yuliarto, Brian
• Is Part Of: Chemistry, an Asian journal. Volume 17:Issue 17(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-12
• Subjects: PEDOT -- Hydrogels -- Electropolymerization -- Conducting Polymer -- Supercapacitors -- Agarose gel; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.202200427
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: Poly(3, 4‐ethylenedioxythiophene) (PEDOT) is a prime example of conducting polymer materials for supercapacitor electrodes that offer ease of processability and sophisticated chemical stability during operation and storage in aqueous environments. Yet, continuous improvement of its electrochemical capacitance and stability upon long cycles remains a major interest in the field, such as developing PEDOT‐based composites. This work evaluates the electrochemical performances of hydroxymethyl PEDOT (PEDOTOH) coupled with hydrogel additives, namely poly(ethylene oxide) (PEO), poly(acrylic acid) (PAA), and polyethyleneimine (PEI), fabricated via a single‐step electrochemical polymerization method in an aqueous solution. The PEDOTOH/PEO composite exhibits the highest capacitance (195.2 F g −1 ) compared to pristine PEDOTOH (153.9 F g −1 ), PEDOTOH/PAA (129.9 F g −1 ), and PEDOTOH/PEI (142.3 F g −1 ) at a scan rate of 10 mV s −1 . The PEDOTOH/PEO electrodes were then assembled into a symmetrical supercapacitor in an agarose gel. The type of supporting electrolytes and salt concentrations were further examined to identify the optimal agarose‐based gel electrolyte. The supercapacitors comprising 2 M agarose‐LiClO4 achieved a specific capacitance of 27.6 F g −1 at a current density of 2 A g −1, a capacitance retention of ∼94% after 10, 000 charge/discharge cycles at 10.6 A g −1, delivering a maximum energy and power densities of 11.2 Wh kg −1 and 17.28 kW kg −1, respectively. The performance of the proposed supercapacitor outperformed several reported PEDOT‐based supercapacitors, including PEDOT/carbon fiber, PEDOT/CNT, and PEDOT/graphene composites. This study provides insights into the effect of incorporated hydrogel in the PEDOTOH network and the optimal conditions of agarose‐based gel electrolytes for high‐performance PEDOT‐based supercapacitor devices. Abstract : A functional PEDOT/gel for supercapacitors : This work examines the electrochemical performance of PEDOTOH/gel composites fabricated via a single‐step electropolymerization technique in an aqueous solution. The best performing PEDOTOH/PEO composite is applied as electrode material for symmetrical supercapacitors in agarose gel electrolyte, demonstrating excellent long‐term cycling stability with a capacitance loss of only 6% after 10000 cycles at a high current density of 10.6 A g −1 .