3D Nitrogen-Doped Graphene Aerogel-Supported Fe3O4 Nanoparticles as Efficient Electrocatalysts for the Oxygen Reduction Reaction

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1、Communicationpubs.acs.org/JACS3DNitrogen-DopedGrapheneAerogel-SupportedFe3O4NanoparticlesasEfficientElectrocatalystsfortheOxygenReductionReaction††††,†,‡,†Zhong-ShuaiWu,ShubinYang,YiSun,KhaledParvez,XinliangFeng,*andKlausMüllen*†Max-Planck-InstitutfürPo

2、lymerforschung,Ackermannweg10,55128Mainz,Germany‡SchoolofChemistryandChemicalEngineering,ShanghaiJiaoTongUniversity,200240,Shanghai,P.R.China*SSupportingInformationsional(3D)graphenenetworksasORRcatalysts.SuchsystemsABSTRACT:Three-dimensional(3D)N-doped

3、gra-areattractivetargets,astheywouldallowtheutilizationofthepheneaerogel(N-GA)-supportedFe3O4nanoparticlesuniquefeaturesofgraphenesheets,suchtheirasrich(Fe3O4/N-GAs)asefficientcathodecatalystsforthemacroporosityandmultidimensionalelectrontransportpath-oxy

4、genreductionreaction(ORR)arereported.Theways.graphenehybridsexhibitaninterconnectedmacroporousInthiscommunication,wedemonstrateFe3O4/N-GAs,aframeworkofgraphenesheetswithuniformdispersionofnovelclassofmonolithicFe3O4NPssupportedon3DN-dopedFe3O4nanopartic

5、les(NPs).Instudyingtheeffectsofthegrapheneaerogels(N-GAs).ThegraphenehybridsshowancarbonsupportontheFe3O4NPsfortheORR,wefoundinterconnectedmacroporousframeworkofgraphenesheetsthatFe3O4/N-GAsshowamorepositiveonsetpotential,withuniformdepositionofFe3O4NPs.

6、Instudyingtheeffectshighercathodicdensity,lowerH2O2yield,andhigherofthecarbonsupportontheFe3O4NPORRcatalyst,wefoundelectrontransfernumberfortheORRinalkalinemediathatFe3O4/N-GAsexhibitamorepositiveonsetpotential,thanFe3O4NPssupportedonN-dopedcarbonblackor

7、highercathodicdensity,lowerH2O2yield,andhigherelectronN-dopedgraphenesheets,highlightingtheimportanceoftransfernumberfortheORRinalkalinemediathanFe3O4NPsthe3DmacroporesandhighspecificsurfaceareaofthesupportedonN-dopedcarbonblack(Fe3O4/N-CB)orN-GAsupportf

8、orimprovingtheORRperformance.dopedgraphenesheets(Fe3O4/N-GSs).Additionally,Fe3O4/Furthermore,Fe3O4/N-GAsshowbetterdurabilitythanN-GAsshowbetterdurabilitythanthecommercialPt/CthecommercialPt/Ccatalyst.catalyst.Thefabricationproces