《非负载Pt纳米颗粒催化剂的电催化氧还原性能研究》.pdf

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1、非负载Pt纳米颗粒催化剂的电催化氧还原性能研究田甜，郑俊生2,3，马建新1,2,3(1．华东理工大学资源与环境工程学院，上海200237；2．同济大学(嘉定校区)新能源汽车工程中心，上海201804；3．同济大学(嘉定校区)汽车学院，上海201804)摘要：制备了一种非负载型Pt催化剂，对其研磨并用氢气进一步还原处理。通过扫描电镜(SEM)和透射电镜(TEM)观察了催化剂形貌，利用循环伏安(CV)和线性扫描伏安(LSV)方法测试电催化性能。SEM结果表明。Pt黑容易聚集在一起形成较大颗粒的二次粒子。TEM结果表明。催化剂结

2、构多样，平均粒径较小。研磨或含氢气体处理后样品发生严重团聚。电化学测试结果表明，催化剂的起始还原电位高于商业催化剂，具有较高的氧还原活性。各种表征测试结果表明改善分散性是提高该催化剂性能的关键因素。关键词：质子交换膜燃料电池；非负载Pt催化剂；分散性；氧还原活性中图分类号：TM911．4文献标识码：A文章编号：1002—087X(2015)07—1404—04ElectrocatalyticoxygenreductionactivityofanunsupportedPtnanoparticlecatalystTIANTia

3、n，ZHENGJun—sheng：，MAJian—xin，，rJ．CollegeofResourceandEnvironmentEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237,China；2．CleanEnergyAutomotiveEngineeringCente~TongiiUniversity(JiadingCampus)，Shanghai201804，China；3．CollegeofAutomotiveStudies，Ton

4、gjiUniversity(JiadingCampuS,Shanghai201804，China)Abstract：UnsupportedPtcatalystwassynthesizedwithoutusingconventionaltemplatesorsurfactants，folowedbygrindingortreatmentinH2andN2mixture．Scanningelectronmicroscope(SEM)andtransmissionelectronmicroscopy(TEM)wereusedto

5、characterizethecatalystmicrostructureandmorphology．SEMresultshowsthattheunsupportedPtnanoparticlesareeasytogathertogetherandtof0rmIargersecondaryparticles．TEMresultindicatesthattheunsupportedPtnanoparticleswithdendriticstructuresandalsosomeelongatedandsphericalpar

6、ticlesoverlapeachother．Ithasasmaleraverageparticlesize(2．46nm)．AndparticlesagglomerateaftergrindingortreatmentinH2andN2mixture．Theelectrocatalyticperformancesofthecatalystweremeasuredbycyclicvoltammetry(CV)andlinearsweepvoltammetry(LSV)techniques．Itisfoundthatthec

7、atalysthasahigheronsetreductionpotentialthanthatofcommercialone。Itisemphasizedthatthecatalystwouldbeakindofhighlyactiveoneifthereareappropriatetreatmentandfurtherresearchtoimproveitsdispensabilityduetoitsdiversityofparticlesshapeandsmallerparticlessize．Keywords：pr

8、otonexchangemembranefuelcell；unsupportedPtcatalyst；dispensability；oxygenreductionactivity质子交换膜燃料电池(protonexchangemembranefuelcell，为随着粒径的减小，表面原子数越多，表面原子配