CdS and PbS nanoparticles co-sensitized TiO_2 nanotube arrays and their enhanced photoelectrochemical property

摘要

TiO_2 nanotube arrays co-sensitized with CdS and PbS nanoparticles (TiO_2 NTs/CdS/PbS) were successfully fabricated by a two-step process of anodization followed by successive ionic layer adsorption and reaction (SILAR) technique. The CdS and PbS nanoparticles grew uniformly on the walls of the TiO_2 nanotubes in sequence, and the surface morphology, structure and photoelectrochemical performance of TiO_2 NTs/CdS/PbS were investigated and discussed. The results show that the co-sensitization results in an increase in the visible light adsorption, photocurrent density, and photocatalytic and pho-toelectrocatalytic activity toward degradation of Rhodamine B (RhB). The corresponding mechanism of the TiO_2 NTs/CdS/PbS for improving the photoelectrochemical property is tentatively proposed. Co-sensitization of TiO_2 NTs by two semiconductors will be an effective way for the development of other high-performance energy-providing materials.