Controllable Synthesis of Ceria Nanoparticles with Uniform Reactive

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1、Articlepubs.acs.org/JPCCControllableSynthesisofCeriaNanoparticleswithUniformReactive{100}ExposurePlanes†,‡,§‡,§,‡††YongChen,ShuhuiLv,ChunlinChen,*ChangjunQiu,XiangfangFan,,‡andZhongchangWang*†SchoolofMechanicalEngineering,UniversityofSouthChina,Hengyang421001,China

2、‡WPIResearchCenter,AdvancedInstituteforMaterialsResearch,TohokuUniversity,2-1-1Katahira,Aoba-ku,Sendai,JapanABSTRACT:Weinvestigate,byasystematicfirst-principlescalculation,thesurfaceenergiesofceria{100}crystalplaneswithadsorptionof13kindsofnonmetallicelementsandnine

3、kindsofmetallicelements.WepredicttheoreticallythatadsorptionofnonmetallicB,C,F,Si,P,S,Cl,Br,OH,andIandmetallicSr,La,Mg,Na,K,Y,Ca,andBacanstabilizetheceria{100}planesthroughloweringtheirsurfaceenergies.Experimentally,wepurposelyselectKOHasamineralizingagentbytakingi

4、ntoaccountthecalculatedsurfaceenergiesandthefactorsinhydrothermalsynthesis,anddemonstrateasuccessfulproductionofcube-shapedcerianano-particlesofhighpurityviacarefullyoptimizingthesynthesisparameters.Furthercomprehensivetransmissionelectronmicroscopystudyidentifiesal

5、ltheexposureplanesofthecube-shapedceriananoparticlesastheuniform{100}crystalplanes.Asaresultofthisuniquemorphology,thenanoparticlesarefoundtoshowmarkedlyenhancedUV-absorptioncapabilityascomparedtoeitheroctahedron-shapedceriananoparticlesorbulkceria.1.INTRODUCTIONan

6、dnanosphereshavebeensuccessfullysynthesizedviaa9−19varietyofmethods.Amongthem,thehydrothermalCeria(CeO2)nanomaterialsfindextensiveapplications,synthesisapproachhasattractedwidespreadattentionbecauserangingfrommicrocircuitpolishingandairpurificationtomanyofitsownmerit

7、sareultimatelyimportantforone-stepsolidoxidefuelcellsowingtotheirenhancedpropertiesin1−5low-temperaturesynthesis,e.g.,simpleoperation,lowenergycomparisontobulkcounterpart.Suchpropertyimprove-20−25consumption,andlarge-scaleindustrialization.Forin-mentforCeO2nanomate

8、rialscanbeattributednotonlytothe26stance,Wuetal.usedthehydrothermalmethodtoprepareincreasedsurfaceareaswiththedowngradeofdimension,buttheCeO2nano