Electroactivity of Pt-Ru-polyaniline composite catalyst-electrodes prepared by electrochemical depos(5)

3.1.Sizeandloadinglevelofcatalysts

ThecrystallinestructuresofthePt–Ru/CBsandPt–Ru/polyanilinecatalystswereinvestigatedbyX-raydiffraction(XRD).Figs.2and3showtheXRDpatternsofthecatalystspreparedbychangingtheplatingtimeofthestep-potentialplatingmethod.Thepeaksat2θ=40°,47°,68°,and82°wereassociatedwiththe(111),(200),(220),and(311)typesre-spectively.AllofthecatalystsdemonstrateddiffractionpatternssimilartothoseofthePt.ThecharacteristicpeaksforRuwerenotclearlyshownintheXRDpatterns.Inthecaseofthe6minplatingtime,thecharacteristicpeaksofPtwerenotdistinct,indicatinginefficientelectrodepositionofthemetalcatalysts.Forthe12minplatingtime,Pt(111)appearedat~40°.

After

Table2

MeansizeandloadingcontentsofPt–Ru/polyanilinecatalystsPlatingtimeCrystallinesizeParticlesize

PtRuAlloyedRu

(min)(nm)a(nm)b(wt.%)c(wt.%)c

(%)6–

7.42.31.320124.3±0.34.57.63.125242.9±0.23.19.34.63536

3.9±0.3

4.2

11.1

5.3

27

a

MeasuredfromXRDresults.b

MeasuredfromTEMresults.c

MeasuredfromICP-AESresults.

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