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时间:2020-03-26
《MClx(M=Pd,Fe,Cr)对有序介孔碳的辅助合成及其负载Pt后的电催化性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao)FebruaryActaPhys.一Chim.Sin.,2010,26(2):385—391385【Article】www.whxb.pku.edu.cnMC1(M=Pd,Fe,Cr)对有序介孔碳的辅助合成及其负载Pt后的电催化性能孙冶何建平周建华王涛狄志勇王道军丁晓春(南京航空航天大学材料科学与技术学院,南京210016)摘要:以MCL(M=Pd,Fe,Cr;x=2,3,3)为金属源,辅助合成有序介孔碳(OMC),以改善其负载Pt后的电催化性能.x射线
2、衍射(XRD)和透射电镜(TEM)测试结果显示,适量PdC12的引入并未破坏介孔碳的有序结构,由于经历有机碳的高温裂解,OMC—PdC1主要以金属Pd为存在形式,较为均一嵌人OMC的骨架中,并在负载Pt的过程中与Pt形成二元催化剂.电化学氢吸附一脱附测试结果表明,Pt/OMC—MCIx表现出优异的催化性能,电化学活性面积为Pt/OMC的2—4倍;其中Pt/OMC.PdC12最佳,活性面积达120.2m·g,Pt/OMC—CrC13和Pt/OMC—FeC13次之.此外,Pt/OMC—MCL还具有良好的催
3、化稳定性,经100个循环测试后,依然保持较高的催化活性,仅衰减22%--40%,使得该材料在催化领域具有很好的应用前景.关键词:金属盐;辅助催化;氢吸附一脱附;催化稳定性;有序介孔碳中图分类号:0648;TQ152MClx(M=Pd,Fe,Cr)AssistedSynthesisofOrderedMesoporousCarbonandTheirElectr0catalyticPerformanceafterLoadingwithPtNanOparticlesSUNDunHEJian—PingZHOUJ
4、ian—HuaWANGTaoDIZhi·-YongWANGDao·-JunDINGXiao-Chun(CollegeofMaterialScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,P.R.China)Abstract:ThePt—loadingpropertiesoforderedmesoporouscarbon(OMC)synthesizedwithassistanceofMClx(
5、M=Pd,Fe,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。’g一followedbyPt/OMC—CrC13andthenPfOMC—FeC13.Afteralong—termcyclicvoltammetrictest,Pt/OMC—MClxstillexhibitsexcellentcatalyticstabilityandrelativelyhighercata
8、lyticactivityasevidencedbya22%一40%decreaseincatalyticactivityafteronehundredcycles.Thisworkwillopenupamostpromisingapplicationincatalysis.KeyWords:Metalsalt;Assistedcatalysis;Hydrogenabsorption—desorption;Catalyticstability;Order
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