期刊
CERAMICS INTERNATIONAL
卷 45, 期 1, 页码 936-947出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.09.269
关键词
DSSC; Nanocompositc; MWCNT; Counter electrode; Renewable energy
资金
- King Fahd University of Petroleum and Minerals Dhahran, Saudi Arabia under DSR project [RG-161002]
Tungsten oxide/titanium oxide nanocomposites (nWO(3)-TiO2) with three different WO3-TiO2 mass ratios (n = 1%, 3% and 5%) were synthesized and used as a photo-anode to fabricate dye sensitized solar cells (DSSC), in conjunction with multiwall carbon nanotube (MWCNTs) as a platinum free (Pt-free) counter electrode. It was observed that [1%WO3-TiO2/N719/MWCNT] DSSC exhibited an efficiency enhancement of about 40% as compared to the conventional TiO2/dye/Pt solar cell, and 18% efficiency enhancement compared to [1%WO3-TiO2/N719/Pt] solar cell. The reduced electron-hole (e, h(+)) recombination in the nWO(3)-TiO2 nanocomposite due to reduced surface trap states, the increased accumulation of electrons at the photo-anode mediated by the photo-excitation of the dye, the efficient electron transportation and increased light absorption can be attributed to the superior performance of [nWO(3)-TiO2/N719/MWCNTI DSSCs in general. Also nWO(3)-TiO2 nanocomposite, when used as a photo-catalyst in the presence of UV radiation for the photo-catalytic degradation of Methylene blue (MB) dye, demonstrated the dye degradation efficiency as high as 99.99%. The enhanced degradation of MB dye further confirms the reduced charge (e, h') recombination and enhanced light absorption, the features essential for a good DSSC. In addition to the photovoltaic and photo-catalytic studies, the morphological and optical characterization of nWO(3)-TiO2 nanocomposite photo-anodes films, the catalytic, electrochemical and electrical characterization of counter electrode and the fabricated DSSCs were carried out.
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