简介:Inthispaper,MPt/C(M=La,Nd)catalystsofPEMFCweresynthesizedbymicrowaveradiationprocess.ThecrystallinityandstructureofcatalystswererespectivelyanalyzedbyXRDandnitrogenadsorptiontests.Theactivityofcatalystswasinvestigatedbyelectrochemistryexperiment.Theresultsshowedthat:1)comparedwithPt/Ccatalystpreparedbytypicalimpregnation-reductionprocess,thesizeofMPt/CcatalystparticledecreasedandtheavailablecrystalforO2reductionincreased;2)theMPt/CcatalystshadrelativelyhighBETsurfaceareas;and3)thesecrystaltransformationsoftheMPt/Ccatalystbroughthightheelectrocatalyticactivity,andasaresult,improvedthepowerofPEMFC.
简介:TheexchangebehaviorsofWO4^2-,MoO4^2-,H2W12O46^6-andMo8O26^4-anionswithinmacroporousexchangeresin(D290)phaseshavebeenstudied.Thevaluesofdiffusionconstant(B),innerdiffusioncoefficient(D^-),retartedtime(τd)half-exchange-period(t1/2),andactivationenergy(ΔE)werefoundfromthekineticanalyses.AnewmethodtoseparateW(VI)andMo(VI)fromeachotherwasalsosuggested.