MnOx-C納米材料的合成與電化學(xué)性能研究.pdf

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3、alsAbstractNanoscaledMn02hasbeenwidelyinvestigatedduetoitsversatileelectrochemicalfunctionalitiesThetheoreticalspecificcapacitanceofMn02is1370F／gMn02callbeusedinsupemapacitors，whichhaveattractedmuchattentionbecauseofenvi

4、ronmentalfriendliness，11igllpowerdensityandsafetyMn02alsoCallbeusedinfuelcellsastheeleetrocatalystduetoitsoxygenreductionreactionfORR)activityFuelceUsareenvironmentallyfriendlyandcontinuouslysupplypowerHowever，poorelectr

5、icalconductivity(105_10七S／cm)limitsMn02frompracticalapplicationsasallelectrodematerialOnecommonlyadoptedstrategytoenhancetheelectricalconductivityofMn02istodepositnanoscaledMn02onthesurfaceofanelectricallyconductivesuppo

6、rtlikecarbonHowever，mostoftheprecedentsyntheticmethodSconfrontaseriesofdisadvantages，includinghightemperature，complexity，timeconsuming，anddifficultytoscaleupHereinwereportaneasyandfastapproachtodepositllanosizedMn02onmul

7、tiwalledcarbonnanotubesfunctionalizedwithhydroxylgroups(MWCNTsOH)bychemicalreductionofKMn04withMnS04inaqueoussolutionunderambientconditionsOursyntheticmethodCallbereadilyscaledupXRDpattemshowsthatobtainedMn02isnano—c巧sta

8、llineinnatureTEMresultsdemonstratethattheoutersurfaceofMWCNTsOHispartiallycoveredbyMn02nanosheets、)l，imathicknessof13腳ataMn02loadingof20wt％Cyclicvoltammetry(cv)andgalvanostaticchargedischargerevealthatMn02／MWCNTs—OH塒maMn

9、02loadingof20wt％hasarelativelyhighspecificcapacitanceof234F／gmscompositealsoshowsagoodcyclingstability，maintaining80％ofitsinitialcapacitanceafter1000cyclesFurthermore。theMn02／MWCNTsOHcompositewithoxygenreduction(ORR)acti

10、vitymayhavepotentialapplicationsinfuelcells，andmetalairbatteriesasanonnoblemetalelectrocatalystHighsurfaceareaofcarbonblackandreducedoxidegraphenewerealsousedassupporttodepositnanoscaledMn02ThespecificcapacitanceofMn02／E

11、C600(50刪)andMn30／rGO(20訓(xùn)％)is175F／gand203F／g，respectivelyMn02／EC600(50叭％)hasORRactivityandCanbeusedinfuelcellsandmetal—airbatteriesasanonnoblemetaleleclrocatalystKeyWords：Mn02；MWCNTsOH；supercapacitor；nonnoblemetalelectroe