Preparation And Photocatalytic Performance Of Non Noble Metal Based Photocatalyst

Facing the depletion of fossil energy and the waste of resources, hydrogen energy as an ideal new energy have been widely favored by research workers due to its high energy density, environmentally friendly, rich in resources and other characteristics. In addition, due to the excessive use of fossil energy, it has caused great damage on the environment. Among them, the most serious is the excessive emissions of CO2. Thus,photocatalytic water splitting into hydrogen and photocatalytic CO2 reduction utilizing solar energy are considered to be the most effective means to solve the above two problems. Therefore, developing an efficient photocatalyst is the key to achieving the above two processes. In general, the research contents of this paper are summarized as follows:Mo2C hollow sphere was prepared by a simple one-step hydrothermal method. Then,CdS nanoparticles were supported on Mo2C-HS by impregnation method to obtain non-noble-metal Mo2C-HS/CdS composite photocatalysts. The morphology, phase,composition and valence of Mo2C-HS/CdS were analyzed by some conventional testing methods. The results of hydrogen evolution from photocatalytic water splitting showed that the photocatalytic hydrogen evolution rate of Mo2C-HS/CdS samples was nearly 36 times higher than that of pure CdS. In addition to hydrogen production activity was significantly enhanced, its hydrogen production stability was greatly improved by inhibiting CdS photocorrosion.Mo2C nanowire was prepared by simple co-precipitation method. Then, CdS nanoparticles were supported on Mo2C-NW by impregnation method to obtain non-noble-metal Mo2C-NW/CdS composite photocatalysts. Under the irradiation of visible light (λ> 420 nm), the Mo2C-NW/CdS composite photocatalyst was tested for photocatalytic hydrogen evolution. The results showed that the maximum hydrogen evolution rate was 1191.8 μmol/h when the amount of CdS was 45 mg and the loading of Mo2C-NW was 10 mg. The stability of the samples under optimal conditions was also tested. The results showed that after 3 cycles, the total amount of hydrogen produced did not show significant decrease, showing good stability.Three kinds of Ga2O3, named H-Ga2O3, A-Ga2O3 and O-Ga2O3, were prepared by hydrothermal method and high-heat treatment. Then, Pt/H-Ga2O3, Pt/A-Ga2O3 and Pt/O-Ga2O3 composite photocatalysts were obtained by supporting Pt nanoparticles on the three different types of Ga2O3. At the same time, the photocatalytic activity and stability of the photocatalytic CO2 reduction were investigated.