電化學可控合成納米錳氧化物及其電化學性質研究.pdf

1、華中農業大學碩士學位論文電化學可控合成納米錳氧化物及其電化學性質研究姓名：文慧申請學位級別：碩士專業：環境工程指導教師：劉凡20090601華中農業大學2009屆碩士學位論文ABSTRACTManganesedioxideWaSwidelyusedinthefieldofchemicalpowerseparationandcatalysisaSacolnnlonmanganeseoxideforitsspecialstructurean

2、dperformanceInordertosynthesizethemanganesewithparticularstructureandmorphologyitspreparationmethodshaSbeenresearchedwidelyanddeeplyThemethodofelectrochemicaldepositionattractscommonattentionforthereasonofitsgentleprepar

3、ationconditions，controllablecomponentsandmorphologyandhighcrystallizationcapacityChangingtheelectrodepositingconditionsoftemperature，pHvalue，electrolytetypeandcurrentdensitywilldeeplyinfluencethecomponents，Mnaveragedegre

4、eofoxidation，crystalstructure，andmorphologyoftheproductElectrocapacitorsisanewtypeofelectrochemicalenergystoragedevicesTheyhavehighpowerdensityhi曲charge／dischargeefficiencyandlongcyclelifeincomparisonwithrechargeablebatt

5、eriesandtraditionalelectrostaticcapacitorsThestudyofsupercapacitorsmainlyconcentratedontheelectrodematerialsAmongstSOmanykindofelectrodematerials，manganesedioxidearousedmostattentionbecauseofitslowprice，environmentalfrie

6、ndlyandexcellentperformancewhichisconsidered嬲themostpotentialelectrodematerialofelectrochemicalcapacitorsThroughchangingthereactionconditionssuchastemperature，voltage，concentrationofH十andmixingMg十，wepreparedaseriesofdiff

7、erentstructuresandmorphologiesofMn02byelectrolysisin005mol／LMnCl2electrolyte，andselectedtherepresentativeMn02嬲theelectrodematerialsofelectrocapacitorsandtookmeaSureofdischargingspecificcapacitanceoftheseMn02byconstantcur

8、rentcharge／dischargeexperimentAccordingtotheexperimentalresults，wediscussedtheeffectsoftemperature，voltage，HionconcentrationandmixingMgforthestucture，morphologyparticlesize，specificsurfaceareaandspecificcapacitanceofdepo

9、sitedMn02Theexperimentalresultsare嬲follows：1ThecrystalstructuresofelectrolyticproductsweremainlyaffectedbytemperatureandconcentrationofH十aMn02Callbepreparedonlyintheconditionsof100℃andC[HCl]=2mol／L，andintheotherelectroly

10、seconditionsoftemperatureandconcentrationofH十，alltheMn02preparedaresimilartoNsutite“一Mn02)2ThemorphologyparticlesizeandspecificsurfaceareaofEMDweremainlyaffectedbytemperature，voltageandconcentrationofH十，hasthefollowingru

11、les：ThemorphologyofEMDshowedaruleofphaSicchangeaSthevoltagerisingwhenthetemperatureandconcentrationofHinacertainconditionneparticlesizeofEMDismainlycontrolledbytemperatureGenerallytheparticlesizewassmaller(between30nm60n