Abstract
A biopolymer electrolyte system having conductivity ∼1.3 × 10−4 S cm−1 has been prepared using potato starch, NaI, glutaraldehyde and poly(ethylene glycol) (PEG; molecular weight = 300). High ionic transference numbers (∼0.99) of the material confirmed its electrolytic behaviour. Conductivity and dielectric behaviour as a function of frequency has been studied. Conductivity follows ‘universal power law’ (σ = σ 0 + Aω n) with exponent ‘n’ varying from 0.94 to 1.18. Cross-linking and plasticization increases long pathways motion of charge carriers, comparable to sample dimension. Humidity-independent behaviour (up to 80% relative humidity), of impedance and water intake by the system, indicates the system’s potentiality as a promising candidate for humidity immune device fabrication. The addition of PEG has a twofold effect on the material’s conductivity. It not only increases conductivity but also improves the material’s immunity towards humid atmosphere.
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Acknowledgment
DST, New Delhi is acknowledged for financial support to ‘Development of sodium ion conducting—electrochemical application’ (DST reference no. SR/S2/CMP0065/2007 dated 8 April 2008). Instruments of the project are used in the present work.
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Tiwari, T., Srivastava, N. & Srivastava, P. Electrical transport study of potato starch-based electrolyte system. Ionics 17, 353–360 (2011). https://doi.org/10.1007/s11581-010-0516-0
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DOI: https://doi.org/10.1007/s11581-010-0516-0
Keywords
- Dielectric permittivity and loss
- Solid polymer electrolyte
- Cross-linker
- Plasticizer
- Biopolymer
- Humidity dependence of impedances
- Universal power law