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<p>Polymer electrolytes, owing to their distinct characteristics, present a viable alternative to liquid electrolytes in batteries. This study presents a biodegradable polymer electrolyte membrane composed of a blend of eucalyptus gum (EG), chitosan (CS), and ammonium thiocyanate (ATC), which demonstrates enhanced ionic conductivity. The amorphous nature of the membranes was confirmed by X-ray diffraction, whereas Fourier-transform infrared spectroscopy analysis elucidated the complexation between the biopolymer blend and the salt. Our results demonstrate that a blend containing 40 wt% of ATC results in six orders of magnitude enhancement in ionic conductivity (1.41 × 10⁻³ S cm<sup>− 1</sup>) at ambient temperature, accompanied by a cation transfer number of 0.92. Moreover, linear sweep voltammetry indicates an electrochemical stability window of 1.93&#xa0;V, and a fabricated proton battery shows an open circuit voltage of 1.79&#xa0;V. These findings highlight the potential of the sustainable EG-CS blend as an efficient and eco-friendly polymer electrolyte for electrochemical device applications.</p>

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Enhanced ionic conductivity in a sustainable eucalyptus gum-chitosan biopolymer electrolyte for electrochemical device applications

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Sandhiya Ezhumalai,
  • Karthikeyan Shunmugavel,
  • M. Kumar,
  • S. Madeswaran,
  • Ankur Rastogi

摘要

Polymer electrolytes, owing to their distinct characteristics, present a viable alternative to liquid electrolytes in batteries. This study presents a biodegradable polymer electrolyte membrane composed of a blend of eucalyptus gum (EG), chitosan (CS), and ammonium thiocyanate (ATC), which demonstrates enhanced ionic conductivity. The amorphous nature of the membranes was confirmed by X-ray diffraction, whereas Fourier-transform infrared spectroscopy analysis elucidated the complexation between the biopolymer blend and the salt. Our results demonstrate that a blend containing 40 wt% of ATC results in six orders of magnitude enhancement in ionic conductivity (1.41 × 10⁻³ S cm− 1) at ambient temperature, accompanied by a cation transfer number of 0.92. Moreover, linear sweep voltammetry indicates an electrochemical stability window of 1.93 V, and a fabricated proton battery shows an open circuit voltage of 1.79 V. These findings highlight the potential of the sustainable EG-CS blend as an efficient and eco-friendly polymer electrolyte for electrochemical device applications.