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- Title
Tuning Anatase-Rutile Phase Transition Temperature: TiO<sub>2</sub>/SiO<sub>2</sub> Nanoparticles Applied in Dye-Sensitized Solar Cells.
- Authors
Cardoso, Billy N.; Kohlrausch, Emerson C.; Laranjo, Marina T.; Benvenutti, Edilson V.; Balzaretti, Naira M.; Arenas, Leliz T.; Santos, Marcos J. L.; Costa, Tania M. H.
- Abstract
TiO2/SiO2 nanoparticles with 3, 5, and 10 molar percent of silica, were synthesized by hydrothermal method and characterized by SEM, TEM, N2 adsorption-desorption isotherms, X-ray diffraction, and Raman and UV-Vis spectroscopy. While pristine TiO2 thermally treated at 500°C presents a surface area of 36 m2 g-1 (±10 m2 g-1), TiO2/SiO2 containing 3, 5, and 10 molar percent of silica present surface areas of 93, 124, and 150 m2 g-1 (±10 m2 g-1), respectively. SiO2 is found to form very small amorphous domains well dispersed in the TiO2 matrix. X-ray diffraction and Raman spectroscopy data show that anatase-to-rutile phase transition temperature is delayed by the presence of SiO2, enabling single-anatase phase photoanodes for DSSCs. According to the I×V measurements, photoanodes with 3% of SiO2 result in improved efficiency, which is mainly related to increased surface area and dye loading. In addition, the results suggest a gain in photocurrent related to the passivation of defects by SiO2.
- Subjects
RAMAN effect; DYE-sensitized solar cells; TRANSITION temperature; PHASE transitions
- Publication
International Journal of Photoenergy, 2019, p1
- ISSN
1110-662X
- Publication type
Article
- DOI
10.1155/2019/7183978