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Understanding Degradation Processes in Automotive Fuel Cells2
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2016-06-08 00:00 447阅读次数
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Understanding Degradation Processes in Automotive Fuel Cells2
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Understanding Degradation Processes in Automotive Fuel Cells2 Understanding Degradation Processes in Automotive Fuel Cells2[详细]
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Degradation of chitosan and starch by 360-kHz ultrasound reductionofmolecularweightofbothpolysaccharides.IthasbeendemonstratedthatattheappliedultrasoundfrequencydegradationiscausedbothbyOHradicalsandmechanochemicaleffects.InAr-saturated2!10K2moldmK3chitosansolutions,pH3,atanultrasounddoserateof170WkgK1,theaveragesonochemicalchainscissionyieldinthesonicationtimerangeof090minisca.8!10K11molJK1.Thisyieldhasbeenshowntodependonpolymerconcentration,ultrasoundpowerandgasusedtosaturatethesolution.Scissionisaccompaniedbysidereactionsleadingtotheformationofcarbonylgroups.Ultrasound-inducedchainscissionofstarchproceedswithloweryield,oneofthereasonsbeingprobablythedifferentchainconformationwhencomparedwithrod-likechitosanmacromolecules.q2004ElsevierLtd.Allrightsreserved.[详细]
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Control领 of Degradation Effects in Radiation Processing of Starch Cornstarchofdifferentphysicalforms(solidandliquid)wasirradiatedwith60Cogammaraysandelectronbeaminthedoserangeof50Gyto100kGytoinvestigatetheeffectofionizingradiationonitsmolecularweight(Mw).Degradationwasobservedforbothsolidandliquidstatesuponradiation.However,degradationofthestarchintheliquidstatewasremarkablygreaterthanthatinthesolidstate.Thefreeradicalsthatformedduringwaterirradiationmustberesponsibleforsuchdegradationintheliquidform.Thermostatedviscometer,rheometerandmulti-anglestaticlaserlightscatteringwereemployedtostudythechangesintheMwofcornstarchthatoccurredduringirradiationatconstanttemperatureanddifferentconcentrations.ItwasobservedthatelectronbeamirradiatedcornstarchhasuniformdecreasinginMwandradiusofgyration(Rg)intherangeof(4.41072.9107gmol21)and(199.385.6nm),respectively.Theinfluenceofgasatmosphereonthedegradationprocessduringgammairradiationwasstudiedtofindthat,theMwandRgvalueswereintherangeof(4.41071.8107gmol21)and(199.3120.4nm)fortheoxygensaturatedsamples,while,theywere(4.41071.05107gmol21)and(199.385.6nm)fortheargonsaturatedsamples.[详细]
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Application of a composite electrolyte in a solidacid fuel cell system: A micro-arc oxidation alumin Amicro-arcoxidationalumina(MOA)supportfilledwithaCsH2PO4protonconductorwasinvestigatedasaninorganiccompositeelectrolyteforaH2/O2solid-acidfuelcell(SAFC).TheMOAsupportwaspolycrystallineandcontaineda-andg-Al2O3phases;while,theprotonconductorCsH2PO4formedaninterlacednetworkwithintheMOAsupport.Thesingle-moduleSAFCusingthefabricatedMOA/CsH2PO4membranedeliveredapeakpowerofw38.5mWcm2andaprotonconductivityofw2.1mScm1atalowtemperature(25C).ComparedtoaSAFCusingananodicaluminamembranecompositeelectrolyte(AAM/CsH2PO4SAFC),whichdisplayedrapiddegradation,theSAFCusingtheMOA/CsH2PO4compositeelectrolyteshowedimprovedstabilitywithcyc领.Thiswasattributedtothecrystallinea-Al2O3phasethatwaspartoftheMOAsupportthathadincreasedthechemicalresistance.[详细]
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Understanding Degradation Processes in Automotive Fuel Cells2
Understanding Instrument Inertia
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