Preparation And Photocatalytic Water Splitting Properties Of La、 Ce Droped NaTaO₃Thin Film

With the rapid development of modern industry, increasing demand for energy isforcing us to research into new resources. It plays a significant roles to use photocatalytichydrogen evolution from water splitting using solar energy to alleviate the energycrisis, protect environment and acchieve sustainable development. In recent years,semiconductor photocatalytic hydrogen evolution attract much attention in the field ofenergy and the environment because of the practical application value.Tantalate series has brought to the attention in hydrolysis hydrogen evolutionbecause of the crystalline structure and electronic structure. The NaTaO3have thehighest photocatalytic activity. The top of valence band is composed of O2p electronorbital, and the low conduction band is composed of Ta5d electron orbital.Theforbidden band width is3.96eV. The structure demand it only absorp ultraviolet partand no photoelectric response to a wide range of visible light range. It is relatively lowphotocatalytic water splitting properties of NaTaO3due to the electronic-holecompound again.Based on the above considerations, we do some process to improve its exist inthese two aspects.Cocatalyst NiO droped on the Ni slice and La and Ce dopingelements to achieve the purpose of improving photocatalytic hydrogen. Main resultsare as follows:(1) We take the Ta2O5and Na2CO3as reaction material, the NaTaO3powder prepared by high temperature solid phase method, then prepareNi/NiO/NaTaO3thin Film on the Ni slice. Studying the light hydrolysisactivity regularity of the composite film as the catalyst. Through the SEM,XRD and light photocatalytic hydrogen tests. The results show that thereaction temperature is1200℃for10h can generated the NaTaO3powderof crystalline best,and the NaTaO3performance photocatalytic hydrolysisof hydrogen activity well. And then through the basement of Ni piece madeNaTaO3thin film after return generated between NaTaO3and Ni piece ofNiO, form the schottky junction for separation of electrons and holes. Thecatalytic efficiency of the NaTaO3thin film photocatalytic activity isimproved to4.5μmol/h in1M NaOH solution.(2) We research crystal structure, morphology, light absorption and the influenceof hydrogen production activity in1M NaOH solution of the La and Cedroped NaTaO3. The NaTaO3:La is white powder, nanometer ladder structureof crystal surface rendering and the NaTaO3:Ce is yellow, crystal surfacehave no obvious change. The ultraviolet area light absorption strength islower than the Ni/NiO/NaTaO3:La. Ni/NiO/NaTaO3:La hydrolysis activity isfour times higher than Ni/NaTaO3average is19.0μmol/h.Ni/NiO/NaTaO3:Ce hydrolytic activity was not significantly improved.