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1、物理化學學報(WuliHuaxueXuebao)FebruaryActaPhys.一Chim.Sin.,2010,26(2):385—391385【Article】www.whxb.pku.edu.cnMC1(M=Pd,F(xiàn)e,Cr)對有序介孔碳的輔助合成及其負載Pt后的電催化性能孫冶何建平周建華王濤狄志勇王道軍丁曉春(南京航空航天大學材料科學與技術學院,南京210016)摘要:以MCL(M=Pd,F(xiàn)e,Cr;x=2,3,3)為金屬源,輔助合成有序介孔碳(OMC),以改善其負載Pt后的電催化性能.x射線
2、衍射(XRD)和透射電鏡(TEM)測試結果顯示,適量PdC12的引入并未破壞介孔碳的有序結構,由于經(jīng)歷有機碳的高溫裂解,OMC—PdC1主要以金屬Pd為存在形式,較為均一嵌人OMC的骨架中,并在負載Pt的過程中與Pt形成二元催化劑.電化學氫吸附一脫附測試結果表明,Pt/OMC—MCIx表現(xiàn)出優(yōu)異的催化性能,電化學活性面積為Pt/OMC的2—4倍;其中Pt/OMC.PdC12最佳,活性面積達120.2m·g,Pt/OMC—CrC13和Pt/OMC—FeC13次之.此外,Pt/OMC—MCL還具有良好的催
3、化穩(wěn)定性,經(jīng)100個循環(huán)測試后,依然保持較高的催化活性,僅衰減22%--40%,使得該材料在催化領域具有很好的應用前景.關鍵詞:金屬鹽;輔助催化;氫吸附一脫附;催化穩(wěn)定性;有序介孔碳中圖分類號:0648;TQ152MClx(M=Pd,F(xiàn)e,Cr)AssistedSynthesisofOrderedMesoporousCarbonandTheirElectr0catalyticPerformanceafterLoadingwithPtNanOparticlesSUNDunHEJian—PingZHOUJ
4、ian—HuaWANGTaoDIZhi·-YongWANGDao·-JunDINGXiao-Chun(CollegeofMaterialScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,P.R.China)Abstract:ThePt—loadingpropertiesoforderedmesoporouscarbon(OMC)synthesizedwithassistanceofMClx(
5、M=Pd,F(xiàn)e,Cr;x=2,3,3)wereinvestigated.X—raydiffraction(XRD)andtransmissionelectronmicroscope(TEM)showthattheorderedstructureiswell·preservedaftertheintroductionofPdC12.BecauseofthepyrolysisoforganiccarbontheOMC—PdCI2ismainlypresentintheformofmetallicPdand
6、ishomogenouslyembeddedintothescafoldoftheOMC.AbinarycatalystcomprisedofmetallicPdandmicrowave—reducedPtnanoparticleswasalsogenerated.Electrochemicalhydrogenabsorption·desorpfiontestsrevealthatPt/OMC-MCLpossessesexcellentcatalyticperformanceandhasanelect
7、rochemicalactivesurfacearea(A)beingas2-4timesasthatofPt/OMC.Pt/OMC·PdC12hasthehighestSEAof120.2m?!痝一followedbyPt/OMC—CrC13andthenPfOMC—FeC13.Afteralong—termcyclicvoltammetrictest,Pt/OMC—MClxstillexhibitsexcellentcatalyticstabilityandrelativelyhighercata
8、lyticactivityasevidencedbya22%一40%decreaseincatalyticactivityafteronehundredcycles.Thisworkwillopenupamostpromisingapplicationincatalysis.KeyWords:Metalsalt;Assistedcatalysis;Hydrogenabsorption—desorption;Catalyticstability;Order