摘要
Theroleofreducedgrapheneoxide(rGO)intheenhancementofphoto-conversionefficiencyofZnOfilmsforphotoelectrochemical(PEC)water-splittingapplicationswasanalyzed.ZnOandrGO-hybridizedZnO(rGO/ZnO)filmswerepreparedviaatwo-stepelectrochemicaldepositionmethodfollowedbyannealingat300°Cunderargongasflow.Thephysical,opticalandelectrochemicalpropertiesofthefilmswerecharacterizedtoidentifytheeffectofrGO-hybridizationontheappliedbiasphoton-to-currentefficiency(ABPE)ofZnO.ScanningelectronmicroscopyandX-raydiffractionindicatedtheformationofverticallyaligned,wurtzite-phaseZnOnanorods.Diffuse-reflectanceUV–visiblespectroscopyindicatedthatrGO-hybridizationwasabletoincreasethelightabsorptionrangeoftherGO/ZnOfilm.UPSanalysisshowedthathybridizationwithrGOincreasedthebandgapofZnO(3.56eV)to3.63eVforrGO/ZnOsample,whichmaybeattributedtotheBurstein–Mosseffect.Photoluminescence(PL)spectradisclosedthatrGOhybridizationsuppressedelectron-holerecombinationduetocrystaldefects.Linearsweepvoltammetryofthepreparedthinfilmsshowedphotocurrentdensityof1.0and1.8mA/cm~2forZnOandrGO/ZnOat+0.7V,whichcorrespondedtoanABPEof0.55%and0.95%,respectively.Thus,thisreporthighlightedthemulti-facetedroleofrGO-hybridizationintheenhancementofZnOphoto-conversionefficiency.
出版日期
2017年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
