Development And Study On Photo?Electro? Catalytic Properties Of CuWo₄ Based Materials

In the face of the problems of increasingly serious environmental pollution and energy exhaustion,it is urgent to seek the technology of environmental management and new energy development.Semiconductor photo?electro?catalytic technology can utilize solar energy to completely mineralize organic pollutants,or oxidize water molecules into green hydrogen energy,which is a research hot in the field of environmental pollutant control and energy regeneration.However,the quantum efficiency of most semiconductors is still low,which is attributed to the fast carriers recombination and the slow interface reaction.In view of this problem,CuWO₄ in visible light response is taken as the main part of this project,and the separation efficiency of photogenerated carriers is improved by morphology regulation and nickel phosphate catalyst modification,the effects of morphology regulation and nickel phosphate catalyst modification on the photocatalytic efficiency of CuWO₄ were investigated.The specific research contents are as follows:?1?CuWO₄ nanofibers photocatalyst was synthesized by electrospinning technology to control the technological parameters of electrospinning,such as spinning voltage,drum speed and propulsion speed to produce CuWO₄ nanowire mesh structure with adjustable diameter and length.And XRD,DRS were used to characterize the crystal structure and optical properties of the samples,methyl orange was used as the simulated pollutant to test the photocatalytic differences between CuWO₄ nanofibers and nanoparticles under visible light.It was found that CuWO₄ nanofibers had better activity,mainly due to the large specific surface area of one-dimensional nanofibers could increase the number of active sites.In addition,CuWO₄ nanofiber photocatalyst is convenient to recycle and is beneficial to the practical application of photocatalyst.Therefore,this project provides a new method for the controllable preparation of one-dimensional CuWO₄ nanofibers,which has important scientific significance.?2?CuWO₄ photoanodes were prepared by sacrificial template method and the nickel phosphate was uniformly loaded onto the surface of copper tungstate by drop coating.It can effectively inhibit the reverse electron transfer speed on the surface of copper tungstate electrode,accelerate the interfacial charge transfer velocity,and improve the photocatalytic water decomposition activity and stability of CuWO₄successfully.Further research found that the nickel phosphate can electrocatalytic the oxidation of water molecules.Under the light illumination,CuWO₄ photogenerated hole can oxidize Ni²⁺of nickel phosphate to Ni^3+/4+in high state,thereby accelerating the interfacial water oxidation rate and inhibiting the interfacial photogenerated charge recombination rate.The development of this subject for the progress of a new type of cocatalyst provides a new thought.