如何做MFC空气阴极.pdf

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1、HowtoMakeCathodeswithaDiffusionLayerforSingle-ChamberMicrobialFuelCellsJoshuaMiddaugh6/5/06UpdatedbyShaoanChengandWenzongLiu,5/12/08IntroductionTheuseofacathodewithadiffusionlayerinasingle-chambermicrobialfuelcell(MFC)cansignificantlyimprovetheperformanceoftheMFCbyincreasingitsco

2、ulombicefficiencyandmaximumpowerdensitywhilesimultaneouslydecreasingitslossofwater.ThecoulombicefficiencyisincreasedbytheincreasedpoweroutputandbytheincreasedoperationtimeoftheMFC.Theoperationtimeislikelyincreaseddueareductionintheamountofoxygenflowtotheanodechamberwherebacteriap

3、referentiallyuseoxygendirectlyasanelectronacceptorinsteadofusingoxygenindirectlyviatheanodeoftheMFC.Oxygenflow,however,isstillnecessaryforthecatalyst-side,whichisoppositetheair-exposedside,ofthecathode.Thus,anoptimumthicknessforthediffusionlayerexistsandisthe2subjectofapaperbyChe

4、ngetal(2006)Theinstructionsbelowdescribehowtomake12cmcircularcathodeswithapolytetrafluoroethylene(PTFE)diffusionlayerofoptimumthickness.Thisprocesstakesseveralhoursduetoanumberofstepsthatrequirewaittime.Pt/CCatalystLayerPTFEDiffusionLayersSOLUTIONSIDEAIRSIDECarbonClothCarbonBaseL

5、ayerFigure1:Exaggeratedside-viewofacathodewithafour-coatingPTFEdiffusionlayerMaterials•CarbonClothwith30%byWeightPTFEWet-Proofing(E-TEKB-1/B/30WP)•CarbonBlackPowder(CabotVulcanXC-72)•40%byWeightPTFESolution(dilutedfrom60%solution)•60%byWeightPTFESolution(AldrichPTFE60wt.%dispersi

6、oninwater)•10%byWeightPlatinumonCarbonPowder(ETEKC1-1010%PtonVulcanXC-72)•5%byWeightNafion®Solution(AldrichNafion®perfluorinatedion-exchangeresin)•PureIso-propanol(99%)(AlfaAesar)•De-ionized(DI)Water•Solidglassbeads,3mmindiameter(PropperManufacturingCo.Inc.)Equipment•MetricRuler•

7、SharpUtilityKnife•ElectronicBalance(Resolutioninmilligrams)•FlatSpatula•1000μLMicropipettorwithSeveralPipetteTips•PieceofCardboard(Approximately1ft.×1ft.)•SmallPaintbrush(1/4in.WideTip)•Furnace(CapableofHeatingat370ºC)•High-TemperatureFiberglassGloves•High-TemperatureCeramicPlate

8、•3.8cmDiameterPunch•SmallMalletorHammer•