Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
DSSC would work as a power source even under interrupted photoirradiation by combining a secondary battery[1]. We have been developing 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical molecule and its polymer analogue, poly(TEMPO methacrylate) (PTMA), as a redox mediator of the DSSC electrolyte[2] and as a cathode active material of a rechargeable battery[3], respectively. We fabricated, in this paper, a charge-storageable DSSC with a photoanode of TiO2/dye, the PTMA cathode, and an anode. The latter cathode and anode pair worked as rechargeable electrodes. The PTMA cathode was prepared with a stainless mesh coated with carbon which enabled to prevent the oxidized mediator into the rechargeable pair. Discharge capacity (e.g. 27 mAh/g) was ca. 30 % of the generated capacity under photoirradiation for 10 minutes. Discharging with the plateau voltage of 0.7 V was observed by using poly(decamethylferrocene) as the anode, which agreed with the difference between the potentials of the PTMA cathode and the anode.
Left : Scheme of a charge-storageable DSSC with the radical polymer/mesh cathode. Right : Molecular structure of PTMA.
[1] Nagai, H. Segawa, Chem. Commun., 2004, 8, 974. [2] Kato, N. Hayashi, Takaya Murakami, C. Okumura, K. Oyaizu, H. Nishide, Chem. Lett,.2010, 39, 464465. [3] H. Nishide, K. Oyaizu, Science, 2008, 319, 737.
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