Abstract
The effect of starch-insoluble remnants (i.e., ghosts) on the behavior of the solid biopolymer electrolyte remains to be studied. This work focused on this issue by considering a case-study system formed by corn starch, glycerol, and lithium chloride. The ghost content was controlled by subjecting the gelatinized dispersion to ultrasonic cavitation at various times. Ghost content reduction led to a slight decrease in conductivity. When the ghost content was reduced to almost nil, the capacitance estimated from cyclic voltammetry tests showed a decrease of about 37%. In contrast, the stability of the electrolyte, estimated by repeated potential cycles, was positively affected. Formation of free radicals and starch chain retrogradation are postulated as the mechanisms involved in the conductivity and capacitance variations in corn starch, glycerol, and lithium chloride solid biopolymer electrolyte.
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Acknowledgements
The authors thank the Consejo Nacional de Ciencia y Tecnología (CONACyT) for partially financing this work through project 236500.
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C. Roldan-Cruz (Ph.D. student) designed and performed the EIS experiments. A. Garcia-Hernandez (Ph.D. student) obtained the optical and SEM micrographs and carried out the conductivity, opacity, and contact angle determinations. E. J. Vernon-Carter proposed the use of contact angle and EIS for monitoring film stability. J. Alvarez-Ramirez organized results and discussion. All authors contributed to the writing of the manuscript.
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Roldan-Cruz, C., Garcia-Hernandez, A., Vernon-Carter, E.J. et al. Impact of insoluble starch remnants on the behavior of corn starch/glycerol/LiCl solid electrolyte. Ionics 23, 1721–1732 (2017). https://doi.org/10.1007/s11581-017-2014-0
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DOI: https://doi.org/10.1007/s11581-017-2014-0