Highly Conductive Redox-Couple Solid Polymer Electrolyte System: Blend-KI-I2for Dye-Sensitized Solar Cells

[摘要] Ionic conductivity of a redox-couple solid polymer electrolyte system, (1−x) blend:x[0.9KI : 0.1I2] withx=0-0.15inweight 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 withx=0.15showed ionic conductivity of7×10−4S cm−1and iodine ion diffusivity of nearly4×10−7 cm2 s−1at25°C. The conductivity and diffusivity values were nearly two orders of magnitude higher than those of the PEO-KI-I2due 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-I2only.

[学科分类] 电子、光学、磁材料