Preparation And Photocatalytic Hydrogen Production Performance SrTiO₃ And Its Heterojunction

Because water is the only product of combustion of hydrogen, it has generally been considered to be the best pollution-free green energy in the new century. Hydrogen does not exist in the atmosphere, but exists in large quantities in a variety of water. Currently, producing hydrogen by water electrolysis is a mature technology, but this method requires a lot of energy supply and high cost. It has been a desire for researchers in energy and environmental science to find a convenient and inexpensive method for the production of hydrogen. Japanese scholars Fujishima and Honda [1] reported the use of TiO2 as a photoelectrode for photocatalytic decomposition of water to produce hydrogen gas under UV irradiation, which created the study of photocatalytic hydrogen production in history.In this paper, tetrabutyl titanate and strontium nitrate were firstly used as the main raw material to prepare sheet-like strontium titanate powder by solvothermal method. Then, a sheet of strontium titanate used as one semiconductor photocatalytic material were compounded with ternary sulfides to prepare heterojunction photocatalytic material by hydrothermal method.1) The heterojunction structure SrTiO3/ZnxCd1-xS with different molar ratio was prepared by hydrothermal method. Finally, the samples with different molar ratio of Zn、Cd were obtained by adjusted the value of x(0、0.2、0.4、0.6、0.8、1). The samples were characterized using X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and ultraviolet-visible(UV-Vis) spectroscopy. Photocatalytic hydrogen production of the samples had been investigated in the presence of visible light. The results showed that SrTiO3 compounding ZnxCd1-xS could effectively enhance the hydrogen production performance of water photolysis. The heterojunction structure SrTiO3/Zn0.6Cd0.4S with the molar ratio of 1:5 had the maximum photocatalytic activity for H2 production. The hydrogen production rate after cycles was 5.3 mmol?g-1?h-1.2) The heterojunction structure SrTiO3/ZnxCd1-x S with different molar ratio was prepared by one step coprecipitating method. Finally, the samples with different molar ratio of Zn、Cd were obtained by adjusted the value of x(0、0.2、0.4、0.6、0.8、1). The results showed that photocatalytic material of heterojunction structure SrTiO3/ZnxCd1-xS prepared by low hydrothermal method could significantly enhance the performance of photocatalytic hydrogen production. SrTiO3/Zn0.5Cd0.5S with the molar ratio of 1:1 has the maximum photocatalytic activity for H2 production and the hydrogen production rate was 349.6 μmol?g-1?h-1.3) The heterojunction structure SrTiO3/AgIn5S8 with different molar ratio was prepared by hydrothermal method. The samples were characterized using X-ray diffraction(XRD), scanning electron microscopy(SEM) and ultraviolet-visible(UV-Vis) spectroscopy. Photocatalytic hydrogen generation of the samples has been investigated in the presence of visible light. The results showed that the complex of SrTiO3 and Ag In5S8 are heterojunction material and could effectively enhance the photolysis of water into hydrogen. The heterojunction structure SrTiO3/AgIn5S8 with the molar ratio of 10:1 has the maximum photocatalytic activity for H2 production and the hydrogen production rate was 70.45 μmol?g-1?h-1.