20175.鐵酸鉍可見光催化材料的可控合成及其光電化學(xué)性能研究

1、分類號：TQ426密級：UDC：544.4學(xué)校代碼：11065碩士學(xué)位論文鐵酸鉍可見光催化材料的可控合成及其光電化學(xué)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(xué)性能研究朱玉坤朱玉坤指導(dǎo)教師于建強(qiáng)教授學(xué)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