Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
A nitroxide radical, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)[1], and poly(vinylferrocene)[2] were applied to dye-sensitized solar cell (DSSC) as a redox mediator and a redox active electrode material, respectively. Poly(vinylferrocene) gave a reversible redox at 0.48 V vs. Ag/AgCl with high charge diffusion coefficient in the polymer layer. DSSC was fabricated with the photoanode composed of D205-adsorbed TiO2, the TEMPO mediator (0.66 V vs. Ag/AgCl), and the poly(vinylferrocene) electrode as a counter electrode. Photovoltaic performance of the cell suggested effective regeneration or reduction of the oxidized mediator with poly(vinylferrocene). A rechargeable DSSC was fabricated with the photoanode, the mediator, the poly(vinylferrocene) electrode, and a charge-storable electrode. In the rechargeable DSSC, poly(vinylferrocene) performed as both a counter electrode and a charge-storage electrode. Regeneration or reduction of the oxidized mediator with poly(vinylferrocene) indicated charge storage of the poly(vinylferrocene) electrode in the rechargeable DSSC. Photo-charging and high discharging capacity of 195 mAh/g provided the current even under dark (Figure).
Left : Scheme of charge transfer between TEMPO in the electrolyte and poly(vinylferrocene). Right : (a) Photocurrent between the photoanode and the charge-storable electrode, and (b) discharging current between the poly(vinylferrocene) electrode and the charge-storable electrode.
References [1] F. Kato, N. Hayashi, T. Murakami, C. Okumura, K. Oyaizu, H. Nishide, Chem. Lett., 2010, 39, 464. [2] T. Kawai, C. Iwakura, H. Yoneyama, Electrochim. Acta, 1989, 34, 1357.
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