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<p>Gel polymer electrolytes (GPEs) have been comprehensively explored as a potential replacement for liquid electrolytes in electrochemical devices such as dye-sensitized solar cells (DSSCs). Nonetheless, due to the high crystallinity structure of polymer electrolytes, the ionic conductivity GPEs at ambient temperatures are still far behind those of liquid electrolytes. Thus, this work develops a polyvinyl alcohol (PVA)-based GPE incorporating potassium iodide (KI)-tetrapropylammonium iodide (TPAI) salts and varying concentrations of 1-methyl-3-propylimidazolium iodide (MPII) ionic liquid to enhance amorphicity and charge transport. Comprehensive characterizations, including Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analyses, confirmed MPII’s plasticizing effect, reducing PVA crystallinity and creating ion-conductive pathways. The highest ionic conductivity of 13.90 mS cm<sup>⁻1</sup> was achieved at 12 wt% of MPII, with optimized charge carrier density (9.08 × 10<sup>20</sup>&#xa0;cm⁻<sup>3</sup>), mobility (9.60 × 10<sup>−5</sup> cm<sup>2</sup>&#xa0;V⁻1&#xa0;s<sup>⁻1</sup>), and diffusion coefficient (2.46 × 10<sup>−6</sup> cm<sup>2</sup>&#xa0;s<sup>⁻1</sup>). These results highlight the importance of MPII ionic liquid in optimizing GPEs for advanced DSSC performance.</p>

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Tailoring ion conduction pathways through ionic liquid-polymer interactions in polyvinyl alcohol gel electrolytes

  • 期刊论文

  • 发表日期：

    2026年5月31日

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  • A. A. Rahim,
  • M. H. Buraidah,
  • M. F. Shukur,
  • M. F. Aziz

摘要

Gel polymer electrolytes (GPEs) have been comprehensively explored as a potential replacement for liquid electrolytes in electrochemical devices such as dye-sensitized solar cells (DSSCs). Nonetheless, due to the high crystallinity structure of polymer electrolytes, the ionic conductivity GPEs at ambient temperatures are still far behind those of liquid electrolytes. Thus, this work develops a polyvinyl alcohol (PVA)-based GPE incorporating potassium iodide (KI)-tetrapropylammonium iodide (TPAI) salts and varying concentrations of 1-methyl-3-propylimidazolium iodide (MPII) ionic liquid to enhance amorphicity and charge transport. Comprehensive characterizations, including Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analyses, confirmed MPII’s plasticizing effect, reducing PVA crystallinity and creating ion-conductive pathways. The highest ionic conductivity of 13.90 mS cm⁻1 was achieved at 12 wt% of MPII, with optimized charge carrier density (9.08 × 1020 cm⁻3), mobility (9.60 × 10−5 cm2 V⁻1 s⁻1), and diffusion coefficient (2.46 × 10−6 cm2 s⁻1). These results highlight the importance of MPII ionic liquid in optimizing GPEs for advanced DSSC performance.