Preparation, Characterization And Photoelectrochemical Properties Of Tungsten Tri - Based Photoelectrode

In recent years, semiconductor photo catalyst used in the field of energy and environment is developing rapidly.Amount of papers have reported on WO3 semiconductor materials. The WO3 semiconductor itself, however, has some defects such as its band gap(Eg) is relatively wide and the transferring speed of photo generated charges of WO3 is slow, etc. which limit the actual application of WO3.In order to alleviate the defects of WO3, it is necessary to modify WO3.Based on the above thoughts, FTO/WO3/Ni(OH)2,FTO/WO3/Bi VO4 and multi- hole FTO/WO3 thin films were preparedtomodify WO3 thin film.We preliminary studied the photo electrochemical properties and photo electro-catalitic activity on of WO3 thin film. This content and innovation of this thesis are listed as following:(1)Preparation of FTO/WO3/Ni(OH)2 photo electrodes and their photo-electrochemical and photo electro-catalytical properties.Throug a simple solgel dipping method,after high temperature annealing we prepared FTO/WO3/ N i(OH)2 photo electrode.The samples were characterized by XRD, SEM, DRS and Raman. Results showed that not modify N i(OH)2 photo electrode almost has no photo electro catalytical properties of glucose.After modified N i(OH)2, can enhance photo electro catalytical properties of tungsten trioxide film.(2) Preparation of FTO/WO3/Bi VO4 photo electrodes and their photo-electrochemical and photo electrocatalytical properties. Throug a simple dispensing-calcining-dispensing-calcining method, after high temperature annealing we prepared FTO/WO3/Bi VO4 photo electrode.The samples were characterized by XRD, SEM, DRS and Raman. Results showed that FTO/WO3/Bi VO4 composite film electrodes have biggest current in water splitting and its O xidation potential is more negative, so FTO/WO3/Bi VO4 composite film electrodes can effectively improve the efficiency of water splitting which is related with band structure of Bi VO4 and WO3.(3)Preparation of multihole FTO/WO3 photo electrodes and their photo-electrochemical and photo electrocatalytical properties. Throug a simple hard template method, after high temperature annealing we prepared multihole FTO/WO3 photo electrodes. The samples were characterized by XRD, SEM, DRS and Raman. Results showed that when the percentage content of carbon was 10%, the three tungsten oxide electrode has a larger photoelectric chemical properties.