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- W2089548700 abstract "It is intriguing and challenging to utilize aerogels with a very high surface area to enhance the light-harvesting capacity of a photoanode. Here we demonstrate highly efficient aerogel-modified photoanodes by modifying both the aerogel's microstructure and the photoanode's functions. A low-cost sol–gel and ambient-drying route is developed to fabricate high-quality SiO2 and SiO2–TiO2 hybrid aerogels with tunable surface area (500–1170 m2 g−1) and packing density (0.03–0.27 g cm−3). Two series of hybrid photoanodes integrating SiO2–TiO2 aerogel microparticles and TiO2 nanocrystallites are designed, to overcome the intrinsic weakness of the mesoporous structure in the electron-transporting property. The aerogel-modified photoanodes yield significantly higher photocurrent densities than the TiO2 nanocrystallite photoanode due to their increased dye-loading capacity and the enhanced visible light scattering effect. A distinctive interaction enhancement of the cell efficiency between the dye-loading and the light-scattering effect induced by the aerogel microparticles is observed. At optimal conditions (aerogel: 0.202 g cm−3 packing density, 15 wt% incorporation), the primitive aerogel-modified photoanode exhibits a conversion efficiency of 7.57%, much higher than the pure TiO2 counterpart (3.67%). When optimized with TiCl4 treatment and a higher film thickness, it shows the highest efficiency of 9.41%, 16% higher than the TiCl4-treated TiO2 photoanode modified with a conventional scattering layer. The work affords a simple, powerful and versatile route towards highly efficient hybrid photoanodes utilizing mesoporous materials, and also shows great promise for extension to other applications such as supercapacitors or photocatalysis." @default.
- W2089548700 created "2016-06-24" @default.
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- W2089548700 date "2012-01-01" @default.
- W2089548700 modified "2023-10-17" @default.
- W2089548700 title "Aerogel based SiO2–TiO2 hybrid photoanodes for enhanced light harvesting in dye-sensitized solar cells" @default.
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- W2089548700 doi "https://doi.org/10.1039/c2jm33945e" @default.
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