کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10248858 | 49416 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nanocrystalline TiO2 photosensitized with natural polymers with enhanced efficiency from 400 to 600Â nm
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
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![عکس صفحه اول مقاله: Nanocrystalline TiO2 photosensitized with natural polymers with enhanced efficiency from 400 to 600Â nm Nanocrystalline TiO2 photosensitized with natural polymers with enhanced efficiency from 400 to 600Â nm](/preview/png/10248858.png)
چکیده انگلیسی
TiO2 sensitization for solar applications requires not only efficient but also stable and inexpensive sensitizers. Different condensed tannins extracted from bark wastes of tropical wood trees were studied as possible sensitizers of TiO2. These natural polymers adhere strongly to the TiO2 even from aqueous solutions. Absorption spectra are presented for 1Â mM aqueous sensitizing solutions prepared with lyophilized condensed tannins which absorb light in the visible range. Spectral photocurrent measurements and I-V characterization show that no bias is required for electron injection to the TiO2 from all studied condensed tannins. Incident photon to current efficiency (IPCE) analysis indicates that surface complexation originates absorption bands with different electron injection efficiencies. These play a dominant role in determining IPCE spectral shape. We propose that surface modification by the sensitizer changes the surface trap density, thereby decreasing recombination losses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy Materials and Solar Cells - Volume 85, Issue 3, 31 January 2005, Pages 359-369
Journal: Solar Energy Materials and Solar Cells - Volume 85, Issue 3, 31 January 2005, Pages 359-369
نویسندگان
Rodolfo Espinosa, Inti Zumeta, Jorge L. Santana, Francisco MartıÌnez-Luzardo, Bernardo González, Sergilus Docteur, Elena Vigil,