Electrochemical properties of a novel EDLC derived from plasticized biopolymer based electrolytes with valuable energy density close to NiMH batteries

Shujahadeen B Aziz; Mohamad A Brza; Rebar T Abdulwahid; Jamal Hassan; Hawzhin B Tahir; Sameerah I Al-Saeedi; Ranjdar M Abdullah; Jihad M Hadi

doi:10.1038/s41598-023-48417-6

Electrochemical properties of a novel EDLC derived from plasticized biopolymer based electrolytes with valuable energy density close to NiMH batteries

Sci Rep. 2023 Nov 30;13(1):21139. doi: 10.1038/s41598-023-48417-6.

Authors

Shujahadeen B Aziz^{1

2}, Mohamad A Brza³, Rebar T Abdulwahid^{4

5}, Jamal Hassan⁶, Hawzhin B Tahir⁷, Sameerah I Al-Saeedi⁸, Ranjdar M Abdullah⁷, Jihad M Hadi⁹

Affiliations

¹ Research and Development Center, University of Sulaimani, Qlyasan Street, Sulaimani, Kurdistan Regional Government, 46001, Iraq. shujahadeenaziz@gmail.com.
² Department of Physics, College of Science, Charmo University, Chamchamal, Sulaymaniyah, 46023, Iraq. shujahadeenaziz@gmail.com.
³ Department of Physics, College of Science, Charmo University, Chamchamal, Sulaymaniyah, 46023, Iraq.
⁴ Medical Laboratory Analysis Department, College of Health Sciences, Cihan University Sulaimaniya, Sulaymaniyah, Kurdistan Region, 46001, Iraq.
⁵ Department of Physics, College of Education, University of Sulaimani, Old Campus, Sulaymaniyah, Kurdistan Region, 46001, Iraq.
⁶ Department of Physics, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates. jamal.hassan@ku.ac.ae.
⁷ Research and Development Center, University of Sulaimani, Qlyasan Street, Sulaimani, Kurdistan Regional Government, 46001, Iraq.
⁸ Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, 11671, Riyadh, Saudi Arabia.
⁹ Nursing Department, College of Nursing, University of Human Development, Sulaymaniyah, Kurdistan Regional Government, Iraq.

Abstract

This study introduces a novel system of solid electrolytes for electrical double-layer capacitors (EDLCs) utilizing biopolymer electrolytes with high energy density comparable to NiMH batteries. To prepare the electrolytes, a proton-conducting plasticized chitosan: poly(2-oxazoline) (POZ) with good film-forming properties was fabricated using a solution casting technique, and ammonium trifluoromethanesulfonate (NH₄CF₃SO₃) salt was employed as a proton provider. Various glycerol concentrations were incorporated into the chitosan:POZ: NH₄CF₃SO₃ system to enhance the ionic conductivity and fully transparent films were obtained. The impedance technique was utilized to determine the conductivity and measure the diffusion coefficient, mobility, and number density of ions. The electrochemical measurements, including linear sweep voltammetry (LSV) and cyclic voltammetry (CV), validated the high performance of the system. The EDLC was examined using galvanostatic charge-discharge (GCD) equipment, and the results revealed an energy density of 43 Wh/kg, specific capacitance of 300 F/g, and power density of 1800 W/kg over 500 cycles. These findings suggest that it is plausible to develop EDLCs that resemble batteries, making them a more desirable energy storage option for the industry.