Fabrication And Photorlectrochemical Properties Of Composited Photoelectrdes Based On ?-Fe₂O₃

Since beginning of 21 st century,the demand for the energy source has been increasing with the rapid development of society and economy.Photoelectrochemical?PEC?water splitting,as a promising route of STH conversion,has attracted significant attention recently for its crucial characteristics of being environmentally friendly,efficient,stable,and retrievable.At the same time,the metal oxide semiconductor materials play an important role in the PEC system.Hence,how to reasonably construct the metal oxide semiconductors together and obtain optimal PEC efficiency will be a challenge for preparing alternative photoelectrode.The main contents are as follows:Firstly,Synthesis and Photoelectrochemical Properties of Efficient Photoanodes Built from Fe₂O₃/Ni O HeterostructuresNew photoanodes built from Fe₂O₃/Ni O heterostructures were successfully prepared by the combine of hydrothermal and alcohothermal methods.Simultaneously,we study the growth process of the heterostructured photoelectrode.It is found that the adjustment of the N i?NO3?2·6H2O have an outstanding influence on the morphology of photoelectrode.More important,attaining the optimal PEC of photoelectrode can be realize by alter the morphology and loading of N i O.On this basis,we further reserch the charge transport mechanism of the heterostructured Fe₂O₃/Ni O.Secondly,Sandwich-Nanostructured ?-Fe₂O₃/Zn O Nanowires/N i O Film Photoanode with a Synergistic Effect and p–n unction for Efficient Photoelectrochemical Water SplittingTaking the conduction band and valence band of N i O?Zn O??-Fe₂O₃ into earnest consideration,we construct the sandwich-Nanostructured ?-Fe₂O₃/Zn O Nanowires/N i O film Photoanode on FTO via the twice hydrothermal and alcohothermal methods.In the PEC measurmensts,the 1.0 M Na OH is used as the electrolyte solution,and the Zn O is designed for the middle layer for avoiding the caustic corrosion.Through altering the concentration of N i?NO₃?₂·6H₂O,the morphology and the thickness of the N i O layer have been changed,and the N i O nanoparticles tend to form a 2D morphology.With increasing concentration of N i-?NO3?2·6H2O,the PEC properties of ?-Fe₂O₃/Zn O NRs/N i O initially increased to themaximal value and then decreased dramatically.Hence,we explore the charge transport mechanism of ?-Fe₂O₃/Zn O NRs/Ni O.Finally,Graphene Oxide as Conducting Layer in Cd S QDs/Ti O 2 NWs/?-Fe₂O₃ Heterostructure Catalyst Applied for Efficient Photoelectrochemical PhotoelectrodeTo the best of our knowledge,both Ti O₂ and Cd S are the typical and excellent photocatalytic materials,and the graphene oxide?GO?is an outstanding conducting layer.Based on the rational design,Cd S QDs/GO/Ti O₂ NWs/?-Fe₂O₃ photoelectrode has been successfully prepared by a simple strategy.In the preparation process,although the ?-Fe₂O₃ film was vulnerable to acid corrosion during the synthesis of rutile Ti O₂ NWs,the Ti O₂ seed layer formed over ?-Fe₂O₃ substrate previously could well protect the ?-Fe₂O₃ film.The GO is deposited on the surface of Ti O 2 NWs through a spin coating strategy,and a follow-up annealing at N2 atmosphere.It is found that the morphology of photoelectrode appears the regular changes via adjusting the Cd S QDs concentration.Moreover,we further research the relationship between the PEC property of Cd S QDs/GO/Ti O₂ NWs/?-Fe₂O₃ and the concentration of Cd S QDs.