Study On The Construction Of Micronano Structures And Photocatalytic Properties Of Multicomponent Composite Semiconductors

Energy crisis and environmental pollution are two major factors that restrict the development of human society.An effective way to solve these problems is utilizes the solar energy through semiconductor photocatalytic.Therefore,how to improve the absorption of solar and carrier separation efficiency in semiconductor photocatalysis has become the frist priority.In recent years,oxide semiconductor materials with visible light absorption,such as BiVO₄ and Fe₂O₃,have attracted much attention of researchers.The low absorption of sunlight and the higher carrier recombine efficiency seriously limit their application.The main research works of this paper are mainly divided into the following two aspects:?1?The carrier separation efficiency and the expanding absorption spectrum of the semiconductor were improved by loading the cocatalyst.Firstly,the monomer of BiVO₄was synthesized by a simple hydrothermal method.On this basis,Au and NiS were loading on the surface of BiVO₄ by photoreduction and hydrothermal method respectively to form binary composite photocatalyst.Combining the two resulting binary composite catalysts with the highest efficiency into a ternary catalyst,we obtained a ternary BiVO₄/NiS/Au,which has wide light absorption and high carrier separation efficiency.?2?Using the morphology control,ion doping and loading the cocatalyst,improve the utilization of light,the carrier separation efficiency and surface reaction of hematite.First,FeOOH nanorods were synthesized on conductive glass?FTO?by a hydrothermal method,then FeOOH and phosphate-doped nanorods nanorods with branching structure were synthesized.The photoanode has high photocatalytic efficiency.The photoanode has high solar energy utilization.In order to further reduce carrier recombination,FeOOH,was loading on the surface of the photoanode,further improving the photoelectric conversion efficiency of the photoanode.