Abstract
CdS and Ag2S heteojunctions sensitized TiO2 nanotube arrays (TiO2 NTs/CdS-Ag2S) were prepared by cation exchange between Cd2+ and Ag+ on the basis of the TiO2 NTs/CdS. The deposition of CdS and Ag2S heteojunctions on the upper and inner surface of the TiO2 NTs was confirmed by field emission scanning electron (FE-SEM) and transmission electron microscopes (TEM). The UV-vis spectrum of the TiO2 NTs/CdS-Ag2S revealed the photoresponse range covering the full visible and near-infrared regions, and showed considerable enhanced photoelectrochemical properties. The corresponding charge transfer path of the TiO2 NTs/CdS-Ag2S photoelectrode was also illuminated.
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