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Visible Light Sensitization of TiCh

Rather problematic with TiCk in terms of the attainable process efficiency is its rather wide band gap (3.0-3.2 eV). Consequently, only a small fraction ( 5%) of the overall solar spectrum can be harnessed by this material. Thus, the early work (as in Table 5, Entries 16 and 17, Refs. 236 and 237 respectively) has also included attempts at extending the light response of TiCk from the UV to the visible range see, for example, Refs. 260, 290-296. Reviews of these works are available, see Refs. 20, 32, 297 and 298. For reasons mentioned earlier, we exclude for our discussion, studies oriented toward chemical modification of the TiCk surface with a dye. As sum- [Pg.186]

It must be noted that most studies on metal-doped TiCh are oriented toward the photo-oxidation of environmental pollutants (e.g., 4-nitrophenol,299 4-chloro-phenol300) rather than toward the photoelectrolysis of water (but see Section 6.4 of this Chapter). Other aspects of metal doping include the effect of UV radiation of Ag-doped Ti02 specimens,301 302 plasma treatment,303 and thermal treatment.304 Metal doping by ion implantation of I1O2 has been discussed.91,305 [Pg.187]


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