P2-978Heteroepitaxial Interface in Nanomaterials: A Pathway for Enhanced Oxygen Reduction Reaction (ORR) Key Words: Heteroepitaxial Interface, Nanomaterials, Oxygen Reduction Reaction (ORR)Heterogenouscatalystscomprisingmetal-oxidenanocomposites(MONs)arewidelyusedduetoenhancedperformances,attributedtostronginterfacialeffectsthatimproveselectronictransferandatomicexchangesatmetal-oxideinterface.Inthiswork,weexploredsynthesisofMONsviasimpleinternaloxidationapproach,theirepitaxialinterfacesandhowitaffectsORRperformances⚫Nanophase separation strategy to engineered nanoparticles with heteroepitaxial interface.⚫Enhanced ORR activity of Pt//CeO2nanoparticles due to strengthened interfacial effect at Pt(110) // CeO2(110) interfaceConclusionConcept of Phase SeparationPt//CeO2Nanoparticles⚫Increase the particle size 50~100 nm to further explore patterns evolution, epitaxial interfaces and their effects on electrochemistry.Future PlanIntroductionHeteroepitaxialinterfaceformationinspontaneouslyphase-separatedmetal-oxidenanocomposites(MONs)andtheirinfluenceonenhancingoxygenreductionreaction(ORR)performance.Theme underDiscussionHydrogen Production Catalysts Materials Group, GREEN Nasrat Hannah ShudinE-mail：： SHUDIN.HannahNasrat@nims.go.jpMaterials & SynthesisOxygen Reduction Reaction (ORR)XRDpatternsofbeforeposttreatmenta(i)andafterposttreatmenta(ii).STEMimagesandEDSmappingofPt5CenanocrystalandphaseseparatedPt-CeO2heterostructurea)TEMimage(b-d)FFTpatternsande)schematicillustrationshowingheterostructureofPt-CeO2nanoparticleswithinterfacerelationshipofPt(110)andCeO2(110)•Materials:H2PtCl6.6H20,CeCl3.7H20,graphenenanoplatelets•H2PtCl6.6H20,CeCl3.7H20,graphenenanoplateletswereweightedandplacedinroundbottomflaskwith50mldistilledwaterandstirovernight.•PosttreatmentinmixturegasofCarbonMonoxideandOxygentoinitiatethephaseseparationbyselectiveoxidationofCe.Nanoparticles (~ 10 nm)Bulk particles (~70 µm)PtCePt5Ce alloyArch-torch•Materials:PtandCe•Ingotpreparedbyarc-torchmeltPhase separated bulk Pt-CeO2Phase separated nanoparticles Pt-CeO2a)CVb)LSVmeasurementsperformedat1200rpmina0.1MKOHsolutionc)LSVnormalizedECSAandd)SchematicillustrationsoftopviewandsideviewofPt//CeO2interface.ElectrochemicaldatashowingmorepositiveonsetpotentialforPt(110)//CeO2(110)nanoparticleslikelyduetostrongerinterfacialeffect.HAXPESspectraofthePt4fregion(blue,red,green,andblackcurvesrepresentPtnanoparticles,Pt//CeO2nanoparticles,Pt5Cenanocrystals,andPt5Cebulk,respectively).ThereisadeeplevelshiftinPtcoreband,attributedtostrengthenedinterfacialeffectinnanoparticle,thatenhancedORRactivity.Reference:Shudin,N.H.,Eguchi,R.,Ueda,S.,Singh,A.,Hashimoto,A.andAbe,H.,J.Mater.Chem.A,2025,13,9660-9664
元のページ ../index.html#78