Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Nitroxide radical derivatives, such as 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO), have been successfully applied as the redox mediator of the dye-sensitized solar cell (DSSC)[1]. Aqueous electrolytes are characterized with the high conductivity. We applied 4-hydroxy-TEMPO (TEMPOL), a water-soluble TEMPO derivative, to the aqueous electrolyte-based DSSC. In the aqueous electrolytes, poly(viologen) has an appropriate redox potential as an electrode active material [2] , which was used as a cathode in the charge-storageable DSSC[3].
The DSSC, fabricated with the aqueous solution of 0.5 M TEMPOL, displayed high Voc (0.8 V). Addition of H2O2 as an oxidant improved the FF. The poly(viologen) was examined also as an electrode active material, which gave a reversible redox peak at -0.48 V (vs. Ag/AgCl). The electron transfer from the photo-anode to the electrode was proved by the potential change of the electrode under photo-irradiation. The charge storage in the poly(viologen) was analyzed by the discharge curve and the charging-discharging was also monitored with the color of poly(viologen).
Left : Redox reaction of 4-hydroxy-2,2,6,6-tetramethyl-piperidine-1-oxyl and molecular structure of poly(viologen). Right : Discharging curve of the poly(viologen) electrode after photo-irradiation. Inset: Photos of the charged poly(viologen) electrode.
[1] F. Kato, A. Kikuchi, T. Okuyama, K, Oyaizu, H. Nishide, Angew. Chem., Int. Ed., 2012, 51, 10177. [2] N. Sano, W. Tomita, S. Hara, C. Min, J. Lee, K. Oyaizu, H. Nishide, App. Mater. Interfaces 2013, 5, 1355. [3] H. Nagai, H. Segawa, Chem. Commun., 2004, 8, 974.
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