Preparation And Photocatalytic Properties Of Bi₂S₃/TiO₂ Coaxial Nanocable

In this paper, anodic aluminum oxide(AAO) was used as template to deposit Bi2S3 nanotube, nanowire and Bi2S3/TiO2 coaxial nanocable by potentiostatic. Scanning electron microscopy(SEM), transmission electron microscopy(TEM), Energy Disperse Spectroscopy(EDS), X-Ray diffraction(XRD), X-ray Photoelectron Spectroscopy(XPS) were used to characterize the surface morphologies, crystal structure, elements. In addition, photoelectric response and photocatalytic properites were discussed.Na2S2O3 and Bi(NO3)3 were used to synthesis Bi2S3 in AAO. Deposition was carried out in-1.11 V at 5?.Controlling the deposition time would change Bi2S3 nanotube to nanowire. The external diameter of Bi2S3 was 100 nm. Band gap of Bi2S3 is 1.4 eV. Mott-Schokkty results showed Bi2S3 is p-type semiconductor.Bi2S3/TiO2 coaxial nanocable was prepared in two steps by potentiostatic deposition in AAO. TiO2 nanotube was prepared first, than Bi2S3 was deposed into the TiO2. TEM results showed Bi2S3/TiO2 nanocable was core-shell structure with large interface and the diameter was about 100 nm. The apsorption edge of Bi2S3/TiO2 coaxial nanocable showed a red-shift and was enhanced than TiO2 nanotube significantly. The EIS results showed Bi2S3 could promote the photogenerated carries transfer and separate in Bi2S3/Ti O2 coaxial nanocable. The photocatalytic degradation showed the degradation efficiency increased in the order: Bi2S3/TiO2 > TiO2 >Bi2S3 under the same condition. The reaction kinetics obeyed first-order kinetics. For all the photocatalysis in water splitting, Bi2S3/TiO2 nanocable showed the highest hydrogen evolution of 7.83 ?mol/h/g, the quantum yield was 30.24%, and photon-hydrogen energy conversion efficiency was 17.51%, which were all better than TiO2 nanotube and Bi2S3 nanowire.