Composite electrolyte based on nanostructured Ce0.8Sm0.2O1.9 (SDC) for low-temperature solid oxide fuel cells.pdf

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1、INTERNATIONALJOURNALOFENERGYRESEARCHInt.J.EnergyRes.2009;33:1138–1144Publishedonline2September2009inWileyInterScience(www.interscience.wiley.com).DOI:10.1002/er.1597CompositeelectrolytebasedonnanostructuredCe0.8Sm0.2O1.9(SDC)forlow-temperaturesolidoxidefuelcells1,21,,y111ZhanGao,Zongqian

2、gMao,ChengWang,JianbingHuangandZhixiangLiu1InstituteofNuclearandNewEnergyTechnology,TsinghuaUniversity,Beijing100084,People’sRepublicofChina2DepartmentofEnergyTechnology,RoyalInstituteofTechnology(KTH),S-10044Stockholm,SwedenSUMMARYNanostructuredCe0.8Sm0.2O1.9(SDC)isinvestigatedforlow-tem

3、peraturesolidoxidefuelcellsbasedonSDC-30wt%(53mol%Li2CO3:47mol%Na2CO3)compositeelectrolyteinthiswork.SDCispreparedbythecombinedcitrateandEDTAcomplexingmethod.X-raypowderdiffractionshowsthatitformsawell-cubicfluoritestructureafterbeingsinteredat7001Cfor2h.Theparticleisabout12nmdetectedbythe

4、transmissionelectronmicroscopy.ConductivityforthecompositeismuchhigherthanthepureSDCatcomparabletemperatures.Atransitionofionicconductivityoccursat4501Cforthecompositeelectrolyte.Thesinglecellsarefabricatedbyasimpledry-pressingprocessandtested2at450–6001C.Amaximumpowerdensityof900mWcmand

5、theopen-circuitvoltageof0.92Vareachievedat6001C.Theconductionmechanismhasbeendiscussedbycomparingtheconductivityofcompositeelectrolyteunderdifferentconditions.ACimpedanceforsinglecellindicatesthattheelectrochemicalprocessinvolvingcathodeandanodereactionsistherate-limitingstep.Copyrightr20

6、09JohnWiley&Sons,Ltd.KEYWORDS:low-temperaturesolidoxidefuelcell;nanostructure;Ce0.8Sm0.2O1.9(SDC);compositeelectrolyte1.INTRODUCTIONmanufacturingcostandmaterialsdegradation.Researchforelectrolyte,themostcriticalcompo-Energyconversionusingsolidoxidefuelcells(SOFCs)isahighlyefficientandenvir

7、onmentallynent,hasbeenfocusedontodeveloppracticalfriendlytechnology.Low-temperatureSOFCsSOFCs.Dopedceria(DCO)ispromisingsince(400–6001C)haveattractedmuchattentionastheytheyexhibitmuchhigherionicconductivitythanhavethefollowingdistinguishedadvantages:lowotheroxideele