Enhancement Effect Of Elemental Sulfur And Gold On Photocatalytic Hydrogen Production Of Red Phosphorus And The Electron Capture Mechanism

Photocatalytic H₂ production technology is considered to be an ideal method to solve the problem of energy shortage and environmental pollution crisis since the related solar energy and converted H₂ energy are clean,green and pollution-free.Currently,many semiconductor photocatalysts only respond to ultraviolet and short wavelength visible light.Therefore,developing semiconductor photocatalysts response to visible light and near-infrared region is quite significant.Compared with traditional metal-based and non-metal-based semiconductors,red phosphorus?P?has attracted high attentions for its low price,abundant reserves,environment-friendly materials,wide range of light response and suitable band structure.However,the fast photocarriers recombination rate of P greatly inhibits its H₂ production activity.The purpose of this thesis is to reduce the photo-generated carriers recombination rate and improve the H₂ production activity under wide spectrum.The main research contents and conclusions are presented as follows:?1?Nano P and S/P heterojunction were obtained by hydrothermal method.The SEM,XRD,HRTEM and XPS were conducted to analyse morphology,structure and chemical composition of the samples.With TEOA as sacrificial agent under visible and near-infrared light,the photocatalytic H₂ production performance of S/P heterojunctions were evaluated.S captured photogenerated electrons of P and enhanced the photoncarriers separation efficiency,meanwhile S/P heterojunctions exhibited higher H₂ production activity than P.This work guides us to construct new elemental heterojunction photocatalyst.?2?Au/P photocatalyst was synthesized by loading trace amout of Au onto P surface with simple photoreduction method and its photocatalytic H₂ production performance was studied under visible and near infrared light.0.5%Au/P composite showed the best H₂production activity.Under light inradiation,Au can quickly capture the photogenerated electrons produced by P and enhance the separation efficiency of photocarriers.The result provides reference for exploring metal cocatalysts to enhance the hydrogen production activity of P.