20175.鐵酸鉍可見光催化材料的可控合成及其光電化學性能研究

1、分類號：TQ426密級：UDC：544.4學校代碼：11065碩士學位論文鐵酸鉍可見光催化材料的可控合成及其光電化學性能研究鐵酸鉍可見光催化材料的可控合成及其光電化學性能研究朱玉坤朱玉坤指導教師于建強教授學科專業(yè)名稱工業(yè)催化論文答辯日期2015年6月5日iiAbstractBismuthferriteisapromisingvisiblelightdrivenphotocatalyst.AsatypicalbismuthferriteB

2、i2Fe4O9withabgaparound2.0eVshowsvisiblelightphotocatalyticperfmance.HoweverthephotocatalyticefficiencyofBi2Fe4O9isstillverylowwhichiscloselyrelatedtothesurfacestatusofBi2Fe4O9.Inthisdissertationonthebasisofreactivefacets

3、synthesismphologycontrollingsurfacemodificationwemainlyfocusonthesurfaceatomicstructureengineeringgetransferimprovementindertoenhancethephotocatalyticperfmance.Bi2Fe4O9withahighpercentageof(001)facetsBi2Fe4O9reducedgraph

4、emeoxide(Bi2Fe4O9RGO)compositematerialsweresynthesized.ThesematerialswereacterizedbyXraydiffraction(XRD)scanningelectronmicroscope(SEM)transmissionelectronmicroscope(TEM)Xrayphotoelectronspectroscopy(XPS)techniques.Inadd

5、itionthephotoelectrochemicalpropertieswasinvestigatedundervisiblelightirradiation.MicrocubesmicroplateletsBi2Fe4O9weresynthesizedwithNaOHasmphologycontrollingagentviaahydrothermalprocess.HRTEMimagesconfirmedthatthemicrop

6、lateletsBi2Fe4O9showedalargerpercentageof(001)facetsthanthatofmicrocubes.ThephotogeneratedcurrentdensityofmicroplateletsBi2Fe4O9wasenhancedsignificantlycomparedtothatofmicrocubesBi2Fe4O9duetothemereactivefacetsexposing.W

7、edevelopedanovelwaytosynthesizeultrathinBi2Fe4O9RGOcompositesbyusinggrapheneoxideasatemplate.Asaresultofmphologycontrollingsurfacemodificationreducingofsurfacegesrecombinationtheexistenceofreducedgrapheneoxideonthesurfac

8、eofBi2Fe4O9significantlyaffectedthephotoelectrochemicalactivitiesofBi2Fe4O9undervisiblelightirradiation.Bi2Fe4O9RGOcompositesshowsuperiphotocatalyticactivitytowardsphotoelectrochemicalwateroxidation.Keywd：BismuthferriteM