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• W2466771489 abstract "Abstract Progresses in dye-sensitized solar cells (DSSCs) have revealed limitations due to I−/I3− redox shuttle and the necessity of its replacement. Cobalt-complexe redox species are the most promising alternatives for the application. In the present work, we have optimized the preparation of solar cells based on a Co-complex redox shuttle and Z907 Ru-complex dye. The system has been studied using pristine TiO2 and TiO2_single-layered graphene composite mesoporous layers for the electron transport. Our results on TiO2_graphene are promising since these cells, with the cobalt redox electrolyte, yielded to a power conversion efficiency close to that of a TiO2 photoelectrode combined with the iodine electrolyte. Using the nanocomposite layers permitted a significant increase in the photoelectrode specific surface area, dye loading and then cell short circuit current (Jsc). Moreover, the use of [Co(phen)3]2+/3+ improved the cell Voc due to a higher standard redox potential. However a limitation was found due to a shift of the TiO2 conduction band towards lower energy. Impedance spectroscopy study of the systems revealed a higher recombination rate for the Cobalt electrolyte and that the photoelectrode conductivity was slightly increased by adding graphene. It is shown that, even if improved in the presence of graphene, the charge collection efficiency was lower for the cobalt electrolyte compared to the iodide one. Globaly graphene improved the DSSC performance mainly due to the enlargement of the photoelectrode specific surface area and then of the dye loading." @default.
• W2466771489 created "2016-07-22" @default.
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• W2466771489 date "2016-10-01" @default.
• W2466771489 modified "2023-10-18" @default.
• W2466771489 title "TiO2/graphene nanocomposite layers for improving the performances of dye-sensitized solar cells using a cobalt redox shuttle" @default.
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• W2466771489 doi "https://doi.org/10.1016/j.jphotochem.2016.06.016" @default.
• W2466771489 hasPublicationYear "2016" @default.
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