Abstract
Titanium oxide is as ancient in age as our planet but its use for photoanode is more recent. It exists naturally as rutile (the second most abundant), anatase and brookite ores. The anatase several metastable states trigger diverse spectral responses with Magnifera Indica Linn. (M.indica L) dye as it is synthesized with an N719 dye grown on its matrix. Facile doctor blade method and high temperature sintering at 723 Kwere used in fabrication. Doping of titanium oxide in effect lowers the band gap of TiO2 for photo-excitation caused by a bathochromic shift and simultaneously decreases the rate of recombination in photogenerated electron–hole pairs. This study explored the visible light induced photocatalytic action of doped M.indica L DSSC towards reduction of titaniumoxide bandgap. The SEMmicrographs reveal themolecular interactions and the interplay as electrolytes percolate the intricate N719 dye/Titania framework. Detailed analysis stem from comparison of M.indica L crude faction and the batch separated faction using FTIR spectroscopy. The absorbance peak, rates of reaction and % transmittance identify the particular chromophores responsible for the reaction. Result shows the batch-separated hexane faction approximately 1000 times more efficient than its crude faction although the ff of the crude was only about twice that of the hexane faction. The optical study showed that doping ions lead to an increase in the absorption edge wavelength, and a decrease in the band gap energy of TiO2 nanoparticles. The doped TiO2 nanoparticles in general showed higher photocatalytic activities than the pure ones.
Highlights
Among various semiconductors, TiO2 has been considered the most promising catalyst with many advantages including long-term stability, inexpensive, non-toxic and ability to be used in many bio-compatible forms (Wold, 1993)
This study explored the visible light induced photocatalytic action of doped M.indica L dye-sensitized solar cells (DSSCs) towards reduction of titanium oxide bandgap
This study bears a direct relation of spectral responses to output efficiency performance in M.indica L DSSCs
Summary
TiO2 has been considered the most promising catalyst with many advantages including long-term stability, inexpensive, non-toxic and ability to be used in many bio-compatible forms (Wold, 1993). Recent research attention is focused on the improvement of the catalytic activities of TiO2 catalysts through doping with diverse metal ion oxides (Horiuchi, Miura, Sumioka, & Uchida, 2004), and adaptations of the surface by introduction of metal cations. These ions are either integrated into the crystal lattice, intercalated or spread on the surface of TiO2 as clusters or mononuclear complexes (Choi, Termin, & Hoffmann, 1994). The specific objective is to lessen the energy band gap or to create new energy levels inside the forbidden band gap This reduces the recombination processes by introducing traps for either electrons and/or holes (Shi et al, 2009)
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