Study On The Preparation Of Transition Metal Composite Film And Its Photoelectric Catalytic Performance

In modern society,energy consumption and environmental pollution are two reasons directly affect people's lives.Hydrogen,known as"the ultimate energy source",is gradually needed.Photoelectrochemical?PEC?water splitting is a novel hydrogen production method using photoelectric synergy.In the PEC water splitting,the anode produces oxygen and the cathode produces hydrogen.Therefore,the efficiency of hydrogen and oxygen production of PEC anodes and cathodes plays an important role in the PEC water splitting.There are many kinds of materials for PEC water splitting.In view of the factors affecting the PEC water splitting,researchers have made a lot of explorations.Transition metals have the characteristics of strong light absorption,and gradually come into researchers'attention.Transition metals have their advantages in practical applications,but they also have their disadvantages,such as high photocorresion,high electron-hole recombination rate.On this basis,we have studied the preparation and properties of CuInS₂,ZnFe₂O₄,MoS₂ and SnS₂ composite films.The main contents of this paper are as follows:?1?MoS₂/CuInS₂ heterojunction nanosheets with different morphologies were synthesized by a two-step hydrothermal method.The first step is to synthesize CuInS₂heterojunction nanosheets as the framework;the second step is to synthesize the porous films of MoS₂/CuInS₂ heterojunction nanosheets.The photocathode material was constructed by ion sputtering supported Pt co-catalyst particles,and the PEC performance was studied.By adjusting the feed ratio in the process of synthesizing MoS₂,the size of nanosheets are effectively controlled.The properties of heterojunctions with different morphologies are compared and studied.The separation of electron-hole and the transfer behavior of photogenerated carriers are analyzed,and the optimal synthesis conditions are obtained.The comparison shows that the PEC performance of ternary material better than MoS₂,CuInS₂ and MoS₂/CuInS₂.?2?Pt/SnS₂/ZnFe₂O₄ photocathode material was constructed.Preparation of highly ordered and uniform polystyrene microspheres?PS?using water and ethanol as dispersing medium by dispersion polymerization.Porous antiopal heterostructures composed of ZnFe₂O₄ particles were prepared by impregnation,pulling and calcination of PS microspheres as templates.SnS₂ was loaded on the porous structure of ZnFe₂O₄by liquid deposition technology.SnS₂ deposition amount was changed by controlling deposition time.The best SnS₂/ZnFe₂O₄ performance was obtained by optimizing deposition time.Finally,the PEC performance of SnS₂/ZnFe₂O₄ was further improved by introducing Pt as a co-catalyst by ion sputtering.?3?SnS₂/CuInS₂ heterojunction nanosheet photocathodes was prepared.The obtained hierarchical C₆₀/SnS₂/CuInS₂ nanosheet heterostructure films have good stability.The SnS₂/CuInS₂ films have band-matching energy band structures to form heterojunctions.In addition,the introduction of C₆₀0 clusters plays a very positive role in the absorption of visible light,charge transfer and photoetching of SnS₂/CuInS₂ by heterostructure structure.According to the results of optical and PEC properties test,the PEC performance of SnS₂/CuInS₂ modified by C₆₀0 has been greatly improved after optimization.