Effect of graphene oxide and temperature on electrochemical polymerization of pyrrole and its stability performance in a novel eutectic solvent (choline chloride-phenol) for supercapacitor applications

Hani Ismail*, Idrees Qader, Hasan Alesary, Jalil Kareem, Andrew Ballantyne

*Corresponding author for this work

Research output: Contribution to JournalArticlepeer-review

Abstract

Polypyrrole (Ppy)-modified-graphene oxide (GO) electrodes were synthesized for the first time in a choline chloride-phenol-based deep eutectic solvent (DES) at various temperatures via electrochemical methods without the addition of any inorganic or organic catalysts. The surface morphologies and structures of the modified films were assessed via scanning electron microscopy
(SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) techniques. The electrochemical properties and stability of the modified electrodes were investigated via cyclic voltammetry and impedance spectroscopy at various temperatures and scan rates. The results showed that the specific capacitance of the nanocomposites decreased with increasing scan rate during cycling. Additionally, the specific
capacitances of the pure Ppy and Ppy/GO films increased with increasing
temperature of the electrolyte (monomer-free), attributed to the reduction in viscosity at elevated temperature. The specific capacitances at 5 mV s-1 were found to be 1071.78 F g-1 and 594.79 F g-1 for Ppy/GO(20wt%) at 50ᵒC and 25ᵒC, respectively. It was also observed that the resistance in the cell decreased with increasing electrolyte temperature. Ppy/GO at 50 mV s-1 was found to have the highest capacitance retention of 85% after 2000 cycles, showing good cycling stability than the pure Ppy film. Herein, the incorporation of GO in the Ppy matrix led to improved specific capacitance and cyclic stability, suggesting that Ppy/GO could represent a promising electrode material for supercapacitor applications.
Original languageEnglish
JournalACS Omega
Early online date13 Sep 2022
DOIs
Publication statusPublished - 13 Sep 2022

Keywords

  • General Chemical Engineering
  • General Chemistry

Fingerprint

Dive into the research topics of 'Effect of graphene oxide and temperature on electrochemical polymerization of pyrrole and its stability performance in a novel eutectic solvent (choline chloride-phenol) for supercapacitor applications'. Together they form a unique fingerprint.

Cite this