TiO2纳米纤维的制备及其对甲醇的电催化氧化活性.pdf

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1、物理化学学~(WuliHuaxueXuebao1302ActaP．-Chim．Sin．2015，31(2)，302-308February[Article]doi：10．3866／PKU．WHXB20141203l、)l)lrw．whxb．pku．edu．cnPt，TiO2纳米纤维的制备及其对甲醇的电催化氧化活性陈红王诗贤赵万隆章能能郑颖平孙岳明(东南大学化学化工学院，南京21l189)摘要：采用静电纺丝技术结合还原浸渍法制备了Pt／TiO纳米纤维电催化剂，通过X射线衍射(XRD)分析、扫描电镜(SEM)、透射电镜(TEM)和X射线能谱(EDS)等测试手段对样品的晶相、形貌、微结构和化

2、学组成进行了表征．测试结果表明，TiO纳米纤维为锐钛矿和金红石组成的混晶，Pt纳米颗粒均匀地分布于TiO纳米纤维的表面，且P{颗粒大小较均一，平均粒径为4．0nm。Pt／TiO纳米纤维中PI的质量分数约为20％．采用三电极体系的循环伏安和计时电流电化学分析方法研究了样品在酸性溶液中对甲醇的电催化氧化活性，结果表明，与负载相同质量分数Pl的PfP25和商业Pt／C催化剂相比较，Pt／TiO纳米纤维催化剂对甲醇呈现出较高的电催化氧化活性和更好的稳定性．关键词：静电纺丝：二氧化钛纳米纤维；Pt纳米颗粒；甲醇：催化氧化中图分类号：0646PreparationofPt／TiO2Nanofibe

3、rsandTheirEleCtrocatalytiCActivitytowardsMethanolOxidationCHENHongWANGShi·XianZHAOWan·-LongZHANGNeng-NengZHENGYing-PingSUNYue—Ming(CollegeofChemistryandChemicalEngineering,SoutheastUniversity,Nanjing211189,PR．China)Abstract：APt，1-iO2nanofibercatalysthasbeenpreparedthroughthecombinationofanelectr

4、ospinningtechniquewithareductiveimpregnationmethod．Thecompositions．morphologiesandstructuresofthesampleswerecharacterizedbyX-raydiffraction(XRD)，scanningelectronmicroscopy(SEM)，transmissionelectronmicroscopy(TEM)，andenergydispersivespectroscopy(EDS)．TheresultsshowedthatthecrystalphaseoftheTiO2na

5、nofiberswascomposedofanataseandrutileTiO2．PtnanoparticleswerefoundtobeuniformIVdistributedonthesurfaceoftheTiO2nanofiberswithanaveragesizeof4．0nm．ThemassfractionofPtinthePl，_riO2nanofibercatalystwasabout20％．Theelectrocatalyticactivitiesofthesamplestowardstheoxidationofmethanolweremeasuredbycycli

6、cvoltammetryandchronoamperometryusingathree．electrodesysteminanacidicsolution．ComparedwithPt／P25andcommerciaIPt／Ccatalystscontainingthesamequalitypercentage0fPtnanopaRicles．thePt／TiO2nanofibercatalystexhibitedhighercatalyticactivitytowardstheoxidationofmethanoIandbe~erstability．KeyWords：Electros

7、pinning；Ti02nanofiber；PtnanopaRicle；Methanol；CatalyticoxidationReceived：Septemberl8，2014；Revised：December3，2014；PublishedonWeb：December32O14．．CorrespondingIduthors．ZHENGYing-Ping，Email：ypz_99@163．com；Tel：+86·25—52090619．SUNY