Electrical transport study of potato starch-based electrolyte system-II

• Cheap and bio-degradable polymer electrolyte.
• High conductivity ∼ 9.59 × 10−3 Scm−1.
• Detailed ion dynamics stud.

Glutaraldehyde (GA) crosslinked potato starch, after mixing with sodium iodide (NaI), resulted in electrolyte film having conductivity (σ) ∼ 10−3 S/cm and ionic transference number (tion) ≥ 0.99. Out of two preparation mediums, namely methanol and acetone, methanol based electrolyte system seems to be better. Super-linear power law (SLPL) phenomenon is observed in MHz frequency range and both lattice site potential and coulomb cage potential due to neighboring mobile charge carriers seems to be responsible for existence of SLPL, and variation of power law exponent ‘n’ with salt concentration. These ion dynamics results are supported by dielectric data also. Estimated number of charge carriers ‘N’ and mobility ‘μ’ are discussed with reference to different variants (medium of preparation, plasticizer, and salt content). Material's conductivity strongly depends on humidity.

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