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<p>Renewable energy storage devices utilizing eco-friendly biopolymers sourced from natural resources have garnered significant attention. Corn starch/magnesium trifluoromethanesulfonate [Mg(OTf)<sub>2</sub>]/1-butyl-3-methylimidazolium chloride (BmImCl) solid biopolymer electrolytes were prepared by solution casting technique. The maximum ionic conductivity of 3.40 × 10<sup>−4</sup> S cm<sup>−1</sup> is achieved at ambient temperature upon adulteration of 35 wt.% of BmImCl. The biopolymer electrolytes obey Arrhenius theory which is based on thermal-activated principle. Ionic liquid-added solid biopolymer electrolyte appears at lower glass transition temperature (<i>T</i><sub><i>g</i></sub>) at 12.49&#xa0;°C than ionic liquid-free solid biopolymer electrolyte, as proven in differential scanning calorimetry (DSC) study. The FTIR analysis proves the complexation between corn starch, Mg(OTf)<sub>2</sub> and BmImCl. The potential window of biopolymer electrolyte is widened up to 5.50&#xa0;V upon inclusion of ionic liquid, as proven in linear sweep voltammetry (LSV) study. Since ionic transference number of corn starch-based biopolymer electrolytes is 0.9993 which is close to 1, it proves that the conductivity is dominated by ionic movement. Electrical double layer capacitor (EDLC) fabricated using the most conducting ionic liquid-added biopolymer electrolyte exhibits better electrochemical performance. Based on CV analysis, the specific capacitance of EDLC fabricated is 3.26 F g<sup>−1</sup> which is in good agreement with EIS and GCD findings. Based on the GCD findings, the columbic efficiency, energy density and power density of EDLC fabricated is 60%, 0.4 Wh kg<sup>−1</sup> and 1.18 W kg<sup>−1</sup>, respectively.</p>

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Electrical, thermal, and structural studies of ionic liquid-infused corn starch-based magnesium ion conductors for electrical double layer capacitors (EDLCs) application

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Yong Er Chong,
  • Wey Wen Lee,
  • Kar Kien Ong,
  • Chiam-Wen Liew

摘要

Renewable energy storage devices utilizing eco-friendly biopolymers sourced from natural resources have garnered significant attention. Corn starch/magnesium trifluoromethanesulfonate [Mg(OTf)2]/1-butyl-3-methylimidazolium chloride (BmImCl) solid biopolymer electrolytes were prepared by solution casting technique. The maximum ionic conductivity of 3.40 × 10−4 S cm−1 is achieved at ambient temperature upon adulteration of 35 wt.% of BmImCl. The biopolymer electrolytes obey Arrhenius theory which is based on thermal-activated principle. Ionic liquid-added solid biopolymer electrolyte appears at lower glass transition temperature (Tg) at 12.49 °C than ionic liquid-free solid biopolymer electrolyte, as proven in differential scanning calorimetry (DSC) study. The FTIR analysis proves the complexation between corn starch, Mg(OTf)2 and BmImCl. The potential window of biopolymer electrolyte is widened up to 5.50 V upon inclusion of ionic liquid, as proven in linear sweep voltammetry (LSV) study. Since ionic transference number of corn starch-based biopolymer electrolytes is 0.9993 which is close to 1, it proves that the conductivity is dominated by ionic movement. Electrical double layer capacitor (EDLC) fabricated using the most conducting ionic liquid-added biopolymer electrolyte exhibits better electrochemical performance. Based on CV analysis, the specific capacitance of EDLC fabricated is 3.26 F g−1 which is in good agreement with EIS and GCD findings. Based on the GCD findings, the columbic efficiency, energy density and power density of EDLC fabricated is 60%, 0.4 Wh kg−1 and 1.18 W kg−1, respectively.