MesoporousHollowNitrogen-DopedCarbonNanosphereswithEmbeddedMnFe2O4FeHybridNanoparticlesasEfficientB.doc

ABSTRACT:Exploringsustainableelectrocatalystswithhighcatalyticperformancefortheoxygenreductionreaction(ORR)andoxygenevolutionreaction(OER)remainsacrucialchallengeinthedevelopmentofmetal--N-posedofspinelMnFe2O4/metallicFehybridnanoparticlesencapsulatedinN--atalystissynthesizedviapyrolysisofbimetalion-mercialPt/-airbattery,-N-Casahighlyefficientbifunctionaloxygenelectrocatalystandmayaffordusefulcluesonthedesignandsynthesisofearth-abundanttransitionmetalbasedhighperformanceelectrocatalysts.      KEYWORDS:MnFe2O4/Fehybridnanoparticles;mesoporoushollowcarbonnanospheres;polydopamine;bifunctionaloxygenelectrodecatalyst            Theoxygenelectrodereactionsincludingcathodicoxygenreductionreaction(ORR)andanodicoxygenevolutionreaction(OER)involvemultipleelementarystepscoupledwithmulti--(SHE)ics,whichgreatlyhamperstheefficiencyofregenerativefuelcellsandrechargeablemetal--(Pt)andruthenium(Ru)/iridium(Ir)basedcatalystsarecurrentlythebenchmarkORRandOERcatalysts,-10However,,-14      Inrecentyears,intensiveresearchhasbeenfocusingonearth-abundantfirst-row(3d)transitionmetal-basedoxygenelectrodecatalyststoachieveefficientORR/-16ForORRcatalysis,posedoftransitionmetalonnitrogendopedcarbon(M-N-C,Mstandsfortransitionmetal,suchasMn,Fe,