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1、SupplementaryinformationAmetal-free,polymericphotocatalystforhydrogenproductionfromwaterundervisiblelight1,32,4122XinchenWang,KazuhikoMaeda,ArneThomas,KazuhiroTakanabe,GangXin,521JohanM.Carlsson,KazunariDomen,MarkusAntoniettiMethodsPhotocatalyticreaction.ReactionswerecarriedoutinaPyrextop-irrad
2、iationreaction+vesselconnectedtoaglassclosedgascirculationsystem.PhotoreductionofHtoH2andphotooxidationofH2OtoO2wereperformedseparatelyinaqueoussolutionscontainingmethanolorsilvernitrateassacrificialreagents,respectively.H2productionwasperformedbydispersing0.1gofg-C3N4catalystpowderinanaqueouss
3、olutioncontainingsacrificialelectrondonorssuchastriethanolamineandmethanol(100mL,10vol.%).InthecaseofdepositionofPt,anappropriateamountofH2PtCl6wasdissolved24inthereactantsolution.Forwaterphotooxidation,0.1gofthecatalystand0.2gofLa2O3powderweredispersedintheaqueoussilvernitratesolution(0.01M,10
4、0mL).La2O3,abasicmetaloxide,buffersthepHofthereactantsolutiontopH8–9duringthereaction.Thereactantsolutionwasevacuatedseveraltimestoremoveaircompletelypriortoirradiationundera300Wxenonlampandawaterfilter.Thewavelengthoftheincidentlightwascontrolledbyusinganappropriatecut-offfilter.Thetemperature
5、ofthereactantsolutionwasmaintainedatroomtemperaturebyaflowofcoolingwaterduringthereaction.Theevolvedgaseswereanalyzedbygaschromatography.TheexperimentalerrorintherateofH2evolutionwaswithin15%.Thequantumefficiency11(Φ)wasestimatedbythemethoddescribedpreviouslyusingtheequation:Φ(%)=(2×H/I)×100,wh
6、ereHandIrepresentthenumbersofevolvedH2moleculesandincidentphotons,respectively.Forsimplicity,itisassumedthatallincidentphotonsare121–1absorbedbythephotocatalyst.Thenumberofincidentphotons(3.8×10photons·hat420–460nm)wasmeasuredusingacalibratedSiphotodiode.X-raypowderdiffraction.Measurementsofpow
7、dersampleswereperformedwithaBrukerD8AdvancediffractometerwithCuKα1radiation(λ=1.5406Å).Diffusereflectancemeasurements.OpticaldiffusereflectancespectrawerecollectedatroomtemperaturewithaUV-VISdiffusereflectancespectrometry(DRS;V-56
