The Study of Ion Transport Parameters in MC-Based Electrolyte Membranes Using EIS and Their Applications for EDLC Devices

Shujahadeen B Aziz; Elham M A Dannoun; Rebar T Abdulwahid; Mohd F Z Kadir; Muaffaq M Nofal; Sameerah I Al-Saeedi; Ary R Murad

doi:10.3390/membranes12020139

The Study of Ion Transport Parameters in MC-Based Electrolyte Membranes Using EIS and Their Applications for EDLC Devices

Membranes (Basel). 2022 Jan 24;12(2):139. doi: 10.3390/membranes12020139.

Authors

Shujahadeen B Aziz^{1

2}, Elham M A Dannoun³, Rebar T Abdulwahid^{1

4}, Mohd F Z Kadir⁵, Muaffaq M Nofal⁶, Sameerah I Al-Saeedi⁷, Ary R Murad⁸

Affiliations

¹ Hameed Majid Advanced Polymeric Materials Research Lab, Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
² Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Kurdistan Regional Government, Sulaimani 46001, Iraq.
³ Associate Chair of the Department of Mathematics and Science, Woman Campus, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia.
⁴ Department of Physics, College of Education, University of Sulaimani, Old Campus, Sulaimani 46001, Iraq.
⁵ Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
⁶ Department of Mathematics and Science, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia.
⁷ Department of Chemistry, College of Science, Princess Nuourah Bint Abdulrahman University, Riyadh 11362, Saudi Arabia.
⁸ Department of Pharmaceutical Chemistry, College of Medical and Applied Sciences, Charmo University, Chamchamal, Sulaimani 46023, Iraq.

Abstract

A solution cast technique was utilized to create a plasticized biopolymer-based electrolyte system. The system was prepared from methylcellulose (MC) polymer as the hosting material and potassium iodide (KI) salt as the ionic source. The electrolyte produced with sufficient conductivity was evaluated in an electrochemical double-layer capacitor (EDLC). Electrolyte systems' electrical, structural, and electrochemical properties have been examined using various electrochemical and FTIR spectroscopic techniques. From the electrochemical impedance spectroscopy (EIS), a maximum ionic conductivity of 5.14 × 10^-4 S cm^-1 for the system with 50% plasticizer was recorded. From the EEC modeling, the ion transport parameters were evaluated. The extent of interaction between the components of the prepared electrolyte was investigated using Fourier transformed infrared spectroscopy (FTIR). For the electrolyte system (MC-KI-glycerol), the t_ion and electrochemical windows were 0.964 and 2.2 V, respectively. Another electrochemical property of electrolytes is transference number measurement (TNM), in which the ion predominantly responsibility was examined in an attempt to track the transport mechanism. The non-Faradaic nature of charge storing was proved from the absence of a redox peak in the cyclic voltammetry profile (CV). Several decisive parameters have been specified, such as specific capacitance (C_s), coulombic efficiency (η), energy density (E_d), and power density (P_d) at the first cycle, which were 68 F g^-1, 67%, 7.88 Wh kg^-1, and 1360 Wh kg^-1, respectively. Ultimately, during the 400th cycle, the series resistance ESR varied from 70 to 310 ohms.

Keywords: FTIR; capacitance; charge-discharge profile; electrochemical energy storage device; electrochemical properties; ion transport studies; methylcellulose.