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Advances in OptoElectronics
Volume 2011, Article ID 102932, 5 pages
Research Article

Highly Conductive Redox-Couple Solid Polymer Electrolyte System: Blend-KI-I2 for Dye-Sensitized Solar Cells

1CRC, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia
2Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121 742, Republic of Korea

Received 30 April 2011; Accepted 12 July 2011

Academic Editor: Surya Prakash Singh

Copyright © 2011 Ravindra Kumar Gupta and Hee-Woo Rhee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Ionic conductivity of a redox-couple solid polymer electrolyte system, ( 1 𝑥 ) blend: 𝑥 [0.9KI : 0.1I2] with 𝑥 = 0 0 . 1 5 in weight fraction, is reported. A blend of poly(ethylene oxide) (abbreviated as PEO) and succinonitrile in equal weight fraction was used as a polymeric matrix instead of the PEO and succinonitrile because of its low-cost, electrical conductivity superior to the PEO, and thermal stability better than the succinonitrile. The electrolyte with 𝑥 = 0 . 1 5 showed ionic conductivity of 7 × 1 0 4 S cm−1 and iodine ion diffusivity of nearly 4 × 1 0 7  cm2 s−1 at 25°C. The conductivity and diffusivity values were nearly two orders of magnitude higher than those of the PEO-KI-I2 due to the improved PEO crystallinity. It also exhibited dye-sensitized solar cell efficiency of 2.2% at 100 mW cm−2, which is twice of the cell prepared using the PEO-KI-I2 only.