Electrochemical construction of Z-scheme type CdS-Ag-TiO(2) nanotube arrays with enhanced photocatalytic activity
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The 2-scheme type CdS-Ag-TiO(2) nanotube arrays were constructed by electrochemical methods. The self-organized highly oriented TiO(2) nanotube arrays (TiO(2)NTs) were first prepared by anodizing Ti sheet. Subsequently, the Ag-CdS nanoparticles composed of Ag core and CdS shell were electrodeposited on the TiO(2)NTs. In the prepared three-component system, the Ag-CdS core-shell nanoparticles were well dispersed on the surface of anatase TiO(2) nanotubes. This three-component system exhibited enhanced photoelectrochemical and photocatalytic activities, far exceeding those of the single- and two-component systems. (C) 2011 Elsevier B.V. All rights reserved.