Plasticised chitosan: Dextran polymer blend electrolyte for energy harvesting application: Tuning the ion transport and EDLC charge storage capacity through TiO2 dispersion

Shujahadeen B. Aziz, Ary R. Murad, Rebar T. Abdulwahid, Dara M. Aziz, Ari A. Abdalrahman, Ranjdar M. Abdullah, M. F.Z. Kadir, Omed Gh Abdullah, Norhana Abdul Halim, Jamal Hassan

    Research output: Contribution to journalArticlepeer-review

    2 Scopus citations

    Abstract

    This study investigates the performance of biopolymer electrolytes based on chitosan and dextran for energy storage applications. The optimization of ion transport and performance of electric double-layer capacitors EDCL using these electrolytes, incorporating different concentrations of glycerol as a plasticizer and TiO2 as nanoparticles, is explored. Impedance measurements indicate a notable reduction in charge transfer resistance with the addition of TiO2. DC conductivity estimates from AC spectra plateau regions reach up to 5.6 × 10−4 S/cm. The electric bulk resistance Rb obtained from the Nyquist plots exhibits a substantial decrease with increasing plasticizer concentration, further enhanced by the addition of the nanoparticles. Specifically, Rb decreases from ∼20 kΩ to 287 Ω when glycerol concentration increases from 10 % to 40 % and further drops to 30 Ω with the introduction of TiO2. Specific capacitance obtained from cyclic voltammetry shows a notable increase as the scan rate decreases, indicating improved efficiency and stability of ion transport. The TiO2-enriched EDCL achieves 12.3 F/g specific capacitance at 20 mV/s scan rate, with high ion conductivity and extended electrochemical stability. These results suggest the great potential of plasticizer and TiO2 with biopolymers in improving the performance of energy storage systems.

    Original languageBritish English
    Article number133203
    JournalInternational Journal of Biological Macromolecules
    Volume273
    DOIs
    StatePublished - Jul 2024

    Keywords

    • Biopolymer
    • Energy storage device
    • Glycerol plasticizer
    • Impedance spectroscopy
    • TiO nanoparticle

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