nico2o4纳米多孔薄膜的可控制备与超电容性能

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1、AbstractWiththecontinuousdevelopmentofscienceandtechnology,everyfieldhasnewdemandsofenergystoragedevices．Researcherswereaskedtodevelopenergystoragedeviceswithhighenergydensityandhighpowerdensity．AmongthevariousffnePgystoragedevices，supercapacitoristhemostpromisingo

2、ne．Itiswellknownforitslargeenergydensity,highpowerdensity,goodcyclingstability,andnomemoryeffect．However,theenergydensityandpowerdensityfailedtomeetthedemandsofpracticalapplicationatthesametime．Themainobjectiveinthisresearchistodevelopmethodsforenhancingelectrodere

3、actionkineticsoftheelectrode．Wchavedevelopedmethodssuchashydrothermalsynthesismethod，chemicalbathdepositionmethodtofabricateNiC0204basedporousstructuresonnickelfoamandinvestigatedtheirpseudocapacitiveperformance．PorousNiC0204nanoflake-nanowirestructuredarraysarepro

4、ducedbyhydrothermalmethod．Themorphologyofthearrayschangeswiththegrowthtime．Afterhydrothermalsynthesisfor8hincombinationwimannealingtreatment,theNiC0204arraypresentsananoflake-nanowirehetero．structure．Theformationoftheinterestingmorphologywasrelatedwiththesolubility

5、product(K印)．neporousNiC0204hctero-stmcturearrayexhibitsexcellentpseudocapacitivepropertiesin2MKOH,withahighcapacitanceof891Fg-1at1Ag-1and619Fg_1at40Ag-1beforeactivationaswellaSexcellentcyclingstability．Thespecificcapacitancecanachieveamaximumof1089F喜1atacurrentdens

6、ityof2A菖1，whichCanstillretain1058F旷1(97．2％retention)after8000cycles．Theenhancedpseudocapacitiveperformancesaremainlyattributedtoitsuniquehetero-structurewhichprovidesfastionandelectrontransfer,largereactionsurfaceareaandgoodstrainaccommodation．HierarchicalNiC0204@N

7、iC0204core／shellnanoflakearraysonnickelfoamarefabricatedbyatwo-stepsolution-basedmethodwhichinvolvesinhydrothermalprocessandchemicalbathdeposition．Theobtainedcore／shellnanoflakeshaveacombinedstructureofnanoflakeCOreandnanoflakeshellaswellasthehierarchicalporositymo

8、rphologies．ComparedwiththebareNiC0204nanoflakearrays，thecore／sheUelectrodedisplaysbetterpseudocapacitivebehaviorsin2MKOH，whichcanachievean强_】【imⅧ