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时间:2020-03-26
《具有高活性和突出的抗中毒性能的Pt修饰RuC催化剂的制备和表征.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~(WuliHuaxueXuebao)ActaP.一C.Sin.,2010,26(12):3193-31983193December[Article]www.whxb.pku.edu.cn具有高活性和突出的抗中毒性能的Pt修饰Ru/C催化剂的制备和表征高海丽廖世军曾建皇梁振兴谢义淳(华南理工大学化学与化工学院,广州I510641)摘要:采用两步浸渍.还原法制备了一种具有高Pt利用效率,高性能的Pt修饰的Ru/C催化~U(Ru@Pt/C).对于甲醇的阳极氧化反应,该催化剂的单位质量铂的催化活性分别为Pt/C、自制PtRu/C和商业JMPtRu/C催化剂的1.9、1.5和1.4倍:其
2、电化学活性比表面积分别为Pt/C和自制PtRu/C的1.6和1.3倍.尤为重要的是该催化剂对甲醇氧化中间体具有很好的去除能力,其正向扫描的氧化峰的峰电流密度()与反向扫描氧化峰的峰电流密度(『b)之比可高达2.4,为Pt/C催化剂的『f/『b的2.7倍,表明催化剂具有很好的抗甲醇氧化中间体毒化的能力.另外,Ru@Pt/C催化剂的稳定性也高于Pt/C、自制PtRu/C和商业JMPtRu/C催化剂的稳定性.采用X射线衍射(XRD)、透射电镜(TEM)和X射线光电子能谱(XPS)对催化剂进行了表征,Pl在Ru表面的包覆结构得到了印证.Ru@Pt/C的高铂利用效率、高性能和高抗毒能力使其有望成为一
3、种理想的直接甲醇燃料电池电催化剂.关键词:直接甲醇燃料电池:Pt修饰Ru/C;电催化剂:甲醇氧化:抗中毒能力中图分类号:0643PreparationandCharacterizatiOnofPlatinum-DecoratedRu/CCatalystwithHighPerformanceandSuperiorPoisonToleranceGAOHai—LiLIAOShi—JunZENGJian—HuangLIANGZhen—XingXIEYi—Chun(SchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechno
4、logy,Guangzhou510641,PR.China)Abstract:Aplatinum—decoratedRu/Ccatalyslwithhighplatinumutilizationefficiency.highperformance。andhighpoisoningtolerancewaspreparedusingatwo—stagelmpregnationreductionmethod.WefoundthatforanodicmethanoloxidationthecatalystactivityintermsofthePtloadwas1.9and1.5timesasth
5、atofPt/CandPtRu/Calloycatalysts,respectively.ThesevaluesarealsohigherthanthatofthecommerciaIJMPtRu/Ccatalyst.TheelectrochemicallyactivesurfaceareaofRu(Pt,Cwasfoundtobe1.6and1.3timesasthoseofPt/CandPtRu/Calloycatalysts.respectively.FurthermOre.wefoundthattheratiooftheforwardpeakcurrentdensity()toth
6、ebackwardpeakcurrentdensity(/b)reached2.4,whichwas2.7timesasthatofthePt/Ccatalyst.ThisimpliesthatthePt.decoratedRu/Ccatalystpossessesahightolerancefortheintermediatepoisoningspecies.Inaddition,thestabilityofRu@Pt/CwashigherthanthatofPt/C,PtRu/CalloyandJMPtRu/C.ThecatalystwascharacterizedbyX.raydif
7、raction(XRD),transmissionelectronmicroscopy(TEM),andX—rayphotoelectronspectroscopy(XPS).TheCOre.shelIstructureofthecatalystwasdeterminedbyXRDandTEM.ThehighperformanceandhighpoisoningtoleranceofRu@Pt/Cduringtheano
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