Impact of nanoparticles preparation method on the synergic effect in anatase/rutile mixtures
| Autor: | Koiti Araki, André L.A. Parussulo, Robson R. Guimaraes |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Anatase
Materials science General Chemical Engineering Inorganic chemistry Nanoparticle 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences ESPECTROSCOPIA 0104 chemical sciences Dye-sensitized solar cell Adsorption Chemical engineering Rutile Electrochemistry Photocatalysis 0210 nano-technology Mesoporous material |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0013-4686 |
| Popis: | The synergic effect observed in dye sensitized TiO 2 solar cells cannot be explained simply by the proportion of rutile and anatase nanoparticles in the mesoporous electrode. In fact, subtle differences in the surface chemical composition dramatically influence the adsorption of N719 dye and increase by an order of magnitude the conductivity of sol-gel rutile, enhancing DSSC's efficiency. However, the now similar conductivity of rutile and anatase nanoparticles also changed the charge diffusion mechanism because electrons can flow through both materials avoiding the formation of preferential anatase channels. As a consequence, no maximum was observed in the D n vs %rutile plot, and η and J SC become a linear function of %rutile been proportional to the flux of photoinjected electrons, or in other words to the surface concentration of N719 ruthenium dye. All those features increased the photoexcited electron lifetime, particularly around 90%rutile in homogeneous mixtures, suggesting a new synergic effect in mixed phase materials for photocatalytic applications. |
| Databáze: | OpenAIRE |
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