Dielectric and conduction mechanism studies of PVA-orthophosphoric acid polymer electrolyte

Majid, Siti Rohana and Arof, Abdul Kariem and Kufian, M.Z. (2007) Dielectric and conduction mechanism studies of PVA-orthophosphoric acid polymer electrolyte. Ionics, 13 (4). pp. 231-234. ISSN 0947-7047, DOI https://doi.org/10.1007/s11581-007-0098-7.

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Official URL: https://doi.org/10.1007/s11581-007-0098-7


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 beta-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 sigma(ac) = A omega(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 b,y way ol thc correlated barrier height (CBH) model.

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Pva; H3po4; Dielectric; Conductivity cyclic voltammetry; Conduction model; Relaxation behavior; Ion conduction; Thin-films; Glasses; Semiconductors; Temperature; Chitosan; Blends
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 31 Jul 2013 01:48
Last Modified: 27 Aug 2019 01:30
URI: http://eprints.um.edu.my/id/eprint/7589

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