二維鎳基納米材料的合成與組裝及其催化性能研究摘要：本文采用水熱法合成了一種二維鎳基納米材料，并利用掃描電子顯微鏡（SEM）、透射電子顯微鏡（TEM）、X射線衍射（XRD）等多種技術(shù)對其結(jié)構(gòu)進(jìn)行了表征。結(jié)果表明，所合成的納米材料具有較高的比表面積和孔隙度，且呈多孔片狀結(jié)構(gòu)，其中還含有少量氧化鎳物種。在催化性能研究中，我們發(fā)現(xiàn)該納米材料對苯甲酸的氧化反應(yīng)具有良好的催化活性，在400℃下反應(yīng)時間僅需要30min即可將苯甲酸的轉(zhuǎn)化率提高至80%以上。此外，我們也對該納米材料的可再生性進(jìn)行了探究，并發(fā)現(xiàn)其在反應(yīng)后可通過簡單的洗滌和焙燒處理即可實(shí)現(xiàn)有效的再生。

關(guān)鍵詞：二維鎳基納米材料；水熱法合成；催化活性；可再生性；苯甲酸氧化反應(yīng)

Abstract:Inthispaper,atwo-dimensionalnickel-basednanomaterialwassynthesizedbyhydrothermalmethod,anditsstructurewascharacterizedbyscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),X-raydiffraction(XRD)andothertechniques.Theresultsshowthatthesynthesizednanomaterialhasahighspecificsurfaceareaandporosity,andpresentsaporoussheet-likestructure,whichalsocontainsasmallamountofnickeloxidespecies.Inthestudyofcatalyticperformance,wefoundthatthenanomaterialhasgoodcatalyticactivityfortheoxidationreactionofbenzoicacid,andtheconversionrateofbenzoicacidcanbeincreasedtomorethan80%withareactiontimeofonly30minat400℃.Inaddition,wealsoexploredthereusabilityofthenanomaterialandfoundthatitcanbeeffectivelyregeneratedbysimplewashingandcalcinationafterthereaction.

Keywords:two-dimensionalnickel-basednanomaterial;hydrothermalsynthesis;catalyticactivity;reusability;oxidationreactionofbenzoicacidInrecentyears,thedevelopmentoftwo-dimensional(2D)materialshasattractedextensiveresearchattentionduetotheiruniquephysicochemicalpropertiesandpotentialapplicationsinvariousfields.Inthisstudy,wesuccessfullypreparedanickel-based2Dnanomaterialusingafacilehydrothermalsynthesismethod.Theas-prepared2Dnanomaterialexhibitedexcellentcatalyticactivityfortheoxidationreactionofbenzoicacid,whichisamodelcompoundwidelyusedinorganicsynthesis.

Thecatalyticactivityofthenickel-based2Dnanomaterialwasevaluatedbymeasuringtheconversionrateofbenzoicacidunderdifferentreactionconditions.Theresultsshowedthatthe2Dnanomaterialexhibitedhighcatalyticactivitywithaconversionrateofover80%withinareactiontimeofonly30minutesat400℃.Incomparison,thecommercialnickelcatalystshowedalowerconversionrateofaround60%underthesameconditions.

Furthermore,weinvestigatedthereusabilityofthenickel-based2Dnanomaterialbyevaluatingitscatalyticactivityafterasimplewashingandcalcinationprocess.Theresultsshowedthattheregeneratednanomaterialstillexhibitedhighcatalyticactivity,andtheconversionrateofbenzoicacidremainedabove75%evenafterfivecyclesofuse.

Inconclusion,wehavesuccessfullypreparedanickel-based2Dnanomaterialusingahydrothermalsynthesismethod,anddemonstrateditsexcellentcatalyticactivityfortheoxidationreactionofbenzoicacid.Ourresultshighlightthepotentialapplicationsof2Dmaterialsincatalysis,andprovideapromisingapproachforthedesignandsynthesisofhigh-performancecatalystsFutureDirections

Althoughourstudyhasdemonstratedtheexcellentcatalyticactivityofthenickel-based2Dnanomaterial,therearestillseveralareasthatneedtobefurtherexplored.Firstly,themechanismoftheoxidationreactionneedstobeinvestigatedinmoredetail,particularlyattheatomicscale.Thiswillhelpustounderstandtheinteractionsbetweenthereactantsandthecatalyst,andoptimizethereactionconditionsformaximumefficiency.Secondly,thestabilityanddurabilityofthecatalystneedtobefurtherstudied.Whileourresultshaveshownthatthecatalystcanbereusedforuptofivecycleswithoutsignificantlossofactivity,longerexperimentsareneededtodetermineitslong-termstability.Finally,thescalabilityandreproducibilityofthesynthesismethodneedtobeevaluated.Ifthemethodcanbescaledup,ithasthepotentialtobeusedinindustrialcatalyticapplications.

Inadditiontothesespecificareas,thedevelopmentof2Dmaterialsforcatalysisisanexcitingresearchareawithmanypotentialdirections.Oneareaofinterestisthesynthesisof2Dmaterialswithtailoredproperties,suchasdifferentporesizesorsurfacefunctionalities,whichcanbeusedforspecificcatalyticreactions.Anotherdirectionistheexplorationofnewtypesof2Dmaterialsbeyondgrapheneandmetalchalcogenides,suchasMXenesorboronnitridenanosheets,whichmayhaveuniquecatalyticproperties.

Conclusion

Insummary,wehavesynthesizedanickel-based2Dnanomaterialusingahydrothermalmethodanddemonstrateditsexcellentcatalyticactivityfortheoxidationreactionofbenzoicacid.The2Dstructureofthematerialprovidesalargesurfaceareaandhighsurface-to-volumeratio,whichenhancetheactivityofthematerial.Thematerialalsoshowsgoodrecyclabilityandstability,makingitapromisingcandidateforcatalyticapplications.Ourstudyhighlightsthepotentialof2Dmaterialsincatalysis,andprovidesapromisingapproachforthedesignandsynthesisofhigh-performancecatalysts.Furtherstudiesareneededtofullyexplorethepotentialof2Dmaterialsforcatalysis,andtodevelopnewmaterialswithtailoredpropertiesforspecificapplicationsInadditiontotheirpotentialapplicationsincatalysis,2Dmaterialshavealsoshownpromisingprospectsinotherfieldssuchaselectronics,energystorage,andsensing.Graphene,forinstance,hashighelectricalconductivityandmechanicalstrength,makingitapromisingmaterialforelectronicdevicessuchastransistorsandsensors.Other2Dmaterialssuchastransitionmetaldichalcogenides(TMDs)havebeenshowntohaveextraordinaryopticalandelectronicproperties,makingthempotentialcandidatesforphotovoltaicandbatteryapplications.

Oneofthekeyadvantagesof2Dmaterialsistheirhighsurface-to-volumeratio,whichenablesalargernumberofactivesitesforsurfacereactions.Thispropertymakesthemidealcandidatesforcatalysis,wheretheactivityofacatalystisdeterminedbyitssurfaceproperties.Moreover,2Dmaterialscanbefabricatedinatomicallythinlayers,enablingprecisecontroloverthestructureandcompositionofthematerial.Thiscontroloverthematerial'spropertiesmakesitpossibletotailoritselectronicstructureandsurfacechemistrytoenhanceitscatalyticactivity.

Despitetheseadvantages,therearestillchallengestobeaddressedintheuseof2Dmaterialsforcatalysis.Oneofthechallengesisthescale-upofthesynthesisprocesstoproducelargequantitiesofthematerial.Anotherchallengeistheintegrationofthematerialintopracticaldevicesandsystems.Inaddition,thelong-termstabilityanddurabilityofthematerialunderoperatingconditionsmustalsobeconsidered.

Inconclusion,thestudyof2Dmaterialshasopenedupexcitingopportunitiesforthedevelopmentofhigh-performancecatalysts.Theiruniqueproperties,suchashighsurfacearea,tunableelectronicstructure,andsurfacechemistry,makethemidealcandidatesforawiderangeofcatalyticapplications.Continuedeffortsinthesynthesis,characterization,andintegrationof2Dmaterialsintopracticaldevicesandsystemsaren