Electroactivity of Pt-Ru-polyaniline composite catalyst-electrodes prepared by electrochemical depos(2)

Fuel Cell

1916S.Kim,S.-J.Park/SolidStateIonics178(2008)1915–1921

nanofibers,andorderedmesoporouscarbonshaverecentlybeeninvestigated[31–34].

Thesizeandloadingcontentofcatalystparticlesonthesubstratedeterminethecatalysts'performanceasanelectrodematerial.Ithasbeenreportedthataneffectivedispersionofcatalystparticlescausesadecreaseinsurfacepoisoning.Dif-ferentsubstratesforcatalystparticleshavebeentried,withtheaimofimprovingtheefficiencyofmethanolelectro-oxidation.Conductingpolymerscanbeusedassuitablehostmatricesfordispersingmetallicparticles.Conductingpolymer/metal-nano-particlescompositespermitafacileflowofelectronicchargesthroughthepolymermatrixduringtheelectrochemicalprocess.Additionally,electricalconductingpolymersprovidealowohmicdropofelectrontransferbetweenthemetalcatalystandthesubstrates.Also,metallicparticlescanbedispersedintothematrixofthesepolymers.Bycombiningconductingpolymersandmetalparticles,itisexpectedthatnovelelectrodeswithhigherspecificsurfaceareasandenhancedelectrocatalyticac-tivitiescouldbeprepared.

Recently,Y.E.Sungetal.proposedthatPt–Runanoparti-cles/electricalconductingpolymernanocompositesareeffectiveasanodecatalysts[35].Atthattime,theelectricalconductivityofpolymerswasrelativelylowcomparedwithamorphouscar-bon,andsyntheticmethodswerelimitedtoelectrochemicalpolymerizationfromnonaqueoussystems.Inpreviousstudies[36,37],metalparticlescouldbehomogeneouslydispersedonpolyanilinefilmbyconstantpotentialelectro-platingtechni-ques.However,inourstudy,step-potentialplatingmethodswereutilizedtoobtainasmallersizeandabetterelectrochem-icalactivity.

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