Much scientific literature concerns the use of TiO2 for various applications, as photocatalyst for pollutant degradation, for DSSC, for gas sensors, batteries, etc. In fact, it has good stability, low cost, and low toxicity; however, the main disadvantage is the wide band gap that allows only 5-6 % of the solar spectrum to be exploited. On the other hand, CdS has a smaller band gap, but it is characterized by a very low photostability. The combination of CdS with TiO2 to generate a composite material is of interest since the disadvantages of the two components can be overcome  . In particular, the spectral response of CdS/TiO2 system is extended to the visible region, and the position of the band edges allows the separation of charges upon illumination of CdS with visible light and subsequent injection of electrons from CdS to TiO2. This increases lifetime of separated charges and could also have a positive effect in photocatalysis.
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