Solid-State Supercapacitor Constructed with Organic Electrochromic Electrodes Based on Dithienothiophene and 3,4-Ethylenedioxythiophene


Topal S., Demirtas I., Ertas E., Ustamehmetoğlu B., Sezer E., Öztürk T.

ACS Applied Energy Materials, vol.6, no.22, pp.11532-11540, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 22
  • Publication Date: 2023
  • Doi Number: 10.1021/acsaem.3c01851
  • Journal Name: ACS Applied Energy Materials
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Page Numbers: pp.11532-11540
  • Keywords: dithienothiophene, EDOT, electrochromic, energy storage, supercapacitor
  • Istanbul Technical University Affiliated: Yes

Abstract

Capacitive and electrochromic behaviors of electrodeposited poly{4,4′-[2,6-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl) dithieno[3,2-b:2′,3′-d]thiophene-3,5-diyl] dibenzonitrile}, P[E-CNDTT-E], are reported. The morphological, structural, and electrochemical properties of the polymer are determined by atomic force microscopy, Fourier transform infrared, cyclic voltammetry, spectroelectrochemical measurements, electrochemical impedance spectroscopy, and galvanostatic charging/discharging measurements. Theoretical calculations support the planarity of the structure through O···S interactions, which allow the polymer to have a low band gap of 1.43 eV. P[E-CNDTT-E] has a high capacitance of 223 F g-1 at the current density of 1 A g-1 and displays a color change from purple to gray with an optical contrast of 30% and a coloration efficiency of 450 cm2 C-1 upon applying cathodic potential. The solid-state supercapacitor is constructed, which has a high specific capacitance of 63 F g-1 and a significant energy density of 6.5 W h kg-1. Additionally, the device retains 90% of its capacitance after 8000 cycles.