Dielectric and conduction mechanism studies of PVA-orthophosphoric acid polymer electrolyte |
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Authors: | M. Z. Kufian S. R. Majid A. K. Arof |
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Affiliation: | (1) Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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Abstract: | Polyvinyl alcohol (PVA)-based proton conducting polymer electrolytes have been prepared by the solution cast technique. The conductivity is observed to increase from 10−9 to 10−4 S cm−1 as a result of orthophosphoric acid (H3PO4) addition. The plot of conductivity vs temperature shows that a phase transition occurred at 343 K in the sample PVA-33 wt% H3PO4. The β-relaxation peak is observed at 313 K. The glass transition temperature of PVA-33 wt% H3PO4 is 343 K. Orthophosphoric acid seems to play a dual role, i.e., as a proton source and as a plasticizer. The ac conductivity σ ac = Aω s was also calculated in the temperature range from 303 to 353 K. The conduction mechanism was inferred by plotting the graph of s vs T from which the conduction mechanism for sample PVA-17 wt% H3PO4 was inferred to occur by way of the overlapping large polaron tunneling (OLPT) model and the conduction mechanism for the sample PVA-33 wt% H3PO4 by way of the correlated barrier height (CBH) model. |
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Keywords: | PVA H3PO4 Dielectric Conductivity Conduction model |
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