Affiliations 

  • 1 Reserach and Development Center, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq. Electronic address: shujahadeenaziz@gmail.com
  • 2 Department of Chemistry, College of Science, Charmo University, Chamchamal, Sulaymaniyah 46023, Iraq
  • 3 Department of Physics, College of Education, University of Sulaimani, Sulaymaniyah 46001, Kurdistan Region, Iraq
  • 4 Department of Chemistry, College of Science, University of Raparin, Kurdistan Region 46012, Ranya, Iraq
  • 5 Hameed Majid Advanced Polymeric Materials Research Lab., Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq
  • 6 Centre for Ionic Universiti Malaya (CIUM), Department of Physics, Faculty of Science, Universiti Malaya, Malaysia; Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
  • 7 Department of Physics, Centre for Defence Foundation Studies, National Defence University of Malaysia, Sungai Besi Camp, Kuala Lumpur 57000, Malaysia
  • 8 Department of Physics, Khalifa University, Abu Dhabi, United Arab Emirates. Electronic address: jamal.hassan@ku.ac.ae
Int J Biol Macromol, 2024 Jul;273(Pt 2):133203.
PMID: 38885860 DOI: 10.1016/j.ijbiomac.2024.133203

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.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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