用于燃料电池Co@PtC核壳结构催化剂的制备及表征.pdf

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1、物理化学学~E(WuliHuaxueXuebao)Acta．-Chim．Sin．2013，29(1)，95-10195[Article】doi：10．3866／PKU．WHXB201209272www．whxb．pku．edu．Crl用于燃料电池Co@Pt／C核壳结构催化剂的制备及表征曹春晖林瑞赵天天黄真马建新(同济大学新能源汽车工程中心，上海201804；同济大学汽车学院，上海201804)摘要：采用两步化学还原法制备了Co@Pt／C电催化剂，并在还原气氛下对催化剂进行热处理．通过高分辨透射电镜(HR．TEM)~I]X射线光

2、电子能谱(XPS)等技术对催化剂的微观结构和形貌进行表征．结果表明：形成的Co@Pt／C催化剂具有核壳结构，金属纳米颗粒均匀负载于碳上，其粒径分布范围较窄；热处理对催化剂的结构和形貌有较大影响．利用循环伏安(cv)法和线性伏安扫描(LSV)法表征催化剂的电化学活性、氧还原反应(ORR)动力学特性及耐久性．制备的C0@Pt／C催化剂在电解质溶液中表现出良好的电化学性能，核壳结构的形成有助于提高Pt的利用率．动力学性能测试表明催化剂的ORR反应以四电子路线进行．相比于合金催化剂，核壳结构催化剂的耐久性和稳定性有很大程度的改善．关键

3、词：燃料电池：核壳结构Co@Pt／C催化剂：电化学性能：反应动力学：耐久性中图分类号：0643PreparationandCharacterizationofCore-Shellco@Pt／CCatalystsforFuelCellCAOChun．HuiLlNRuiZHAOTian—TianHUANGZhenMAJian—Xin(CleanEnergyAutomotiveEngineeringCentecTongjiUniversity,Shanghai201804,R．China；SchoolofAutomotiveStud

4、ies，TongjiUniversity,Shanghai201804,PR．China)Abstract：Co⑨PCcore．shelIcatalystshavebeensynthesizedbyatwostepchemicalreductionmethod。foIlowedbyheattreatmentinaH2andN2mixture．Highresolutiontransmissionelectronmicroscopy(HR-TEM)andX—rayphotoelectronspectroscopy(XPS)tech

5、niqueswereusedtocharacterizethecatalystmicrOstructureandmorphology．Theresultsindicatethatthecore．shelIstructureofCorichincoreandPtrichinshelIiSformedandthenano．particlesarehighlydispersedonthesurfaceofthecarbonsuppo~．Heattreatmentaffectsthestructureandmorphologyofth

6、ecatalysts．Theelectrocatalyticperformance，kineticcharacteristicsofO2reductionreaction(ORR)，anddurabilityofthecatalystsweremeasuredbycyclicvoltammetry(CV)andIinearsweepvoltammetry(LSV)techniques．Itwasfoundthattheformationofthecore．shelIstructureiSfavorableforimprovin

7、qtheperformanceandutilizationofPt．TheCo@Pt，Ccatalystmechanismproceedsbyanapproximatelyfour-electronpathwayinacidsolution，throughwhichmolecularoxygeniSdirectlyreducedtowater．Comparedwithalloycatalysts．theformationofthecore—shellstructureobviouslyimprovesthecatalystdu

8、rability．KeyWords：Fuelcell；Core-shellstructureCo@Pt／Ccatalyst；ElectrochemicalperformanceReactionkinetic；DurabilityReceived：July11，2012；Rev