Ni(III)/(IV) Bis(dicarbollide) as a Fast, Noncorrosive Redox Shuttle for Dye-Sensitized Solar Cells

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• 作者：Tina C. Li ; Alexander M. Spokoyny ; Chunxing She ; Omar K. Farha ; Chad A. Mirkin ; Tobin J. Marks ; Joseph T. Hupp
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：April 7, 2010
• 年：2010
• 卷：132
• 期：13
• 页码：4580-4582
• 全文大小：201K
• 年卷期：v.132,no.13(April 7, 2010)
• ISSN：1520-5126

文摘

Nickel bis(dicarbollide) is used as a fast, one-electron outer sphere redox couple in dye-sensitized solar cells. Device performances with this anionic shuttle are investigated with different electrolyte concentrations and additives, using only 0.030 M of the Ni(III) bis(dicarbollide) to efficiently regenerate the ruthenium dye. Atomic layer deposition of Al₂O₃ on the nanoparticulate TiO₂ photoanodes is further used to improve device performances, increasing current densities almost 2-fold and attaining power conversion efficiencies 10× greater than its metallocene analogue, ferrocene/ferrocenium. Open-circuit voltage decay is used to probe the kinetics of the Ni(III)/(IV) bis(dicarbollide) redox couple, and electron interception is found to be 10³× slower than ferrocene/ferrocenium, explaining the large discrepancy in open-circuit voltage potentials between these two redox shuttles.