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1、物理化学学报(WuliHuaxueXuebao)DecemberActaPhys.-Chim.Sin.2011,27(12),2857-28622857[Article]doi:10.3866/PKU.WHXB20112857www.whxb.pku.edu.cn甲醇氧化PtSnCo/C阳极催化剂*李庆武魏子栋陈四国齐学强柳晓丁炜马宇(重庆大学化学化工学院,输配电装备及系统安全与新技术国家重点实验室,重庆400044)摘要:通过乙二醇液相分步还原法制备了金属质量分数为20%的PtSn/C二元及PtSnCo/C三元催化剂
2、.采用X射线衍射(XRD)光谱法、能量散射谱(EDS)对催化剂进行了表征;通过阳极线性伏安扫描法(LSV)、连续循环伏安法(CV)、预吸附单层CO溶出法研究了其电化学性质.结果表明,PtSnCo/C三元催化剂较商业化JM-PtRu/C催化剂具有更好的氧化甲醇催化活性.循环伏安扫描100圈后发现,PtSn/C二元催化剂的甲醇氧化峰电流快速衰减到其初始氧化峰电流的11%左右,而PtSnCo/C三元催化剂仅衰减到其初始值的50%左右,这表明PtSnCo/C三元催化剂具有更好的化学稳定性.在PtSnCo/C催化剂上,甲醇氧化起
3、始电位比直接吸附CO后的CO阳极溶出电位负,意味着甲醇在PtSnCo/C催化剂上氧化的中间产物不是CO,而是比CO更为活泼且易于氧化的中间物种.关键词:直接甲醇燃料电池;PtSnCo/C;PtSn/C;稳定性;甲醇氧化中图分类号:O643.36PtSnCo/CAnodeCatalystforMethanolOxidation*LIQing-WuWEIZi-DongCHENSi-GuoQIXue-QiangLIUXiaoDINGWeiMAYu(StateKeyLaboratoryofPowerTransmissionEq
4、uipment&SystemSecurityandNewTechnology,SchoolofChemistryandChemicalEngineering,ChongqingUniversity,Chongqing400044,P.R.China)Abstract:Abinarymetalliccatalyst(PtSn/C)andaternarymetalliccatalyst(PtSnCo/C)withametalmassfractionof20%werepreparedbyborohydridereductio
5、nandsubsequenthydrothermaltreatmentinaglycolliquidphase.Thestructureandcompositionoftheas-preparedelectrocatalystswerecharacterizedbyX-raydiffraction(XRD)andenergy-dispersivespectrometry(EDS).Theiractivityandstabilityforthecatalysisofmethanoloxidationwereevaluat
6、edbyanodiclinearsweepvoltammetry(LSV),cyclicvoltammetry(CV),andtheanodicstrippingofapre-adsorbedCOmonolayer.WefoundthatthePtSnCo/CcatalystgavethebestcatalyticactivityforthemethanoloxidationofallthecatalystsincludingthecommercialJM-PtRu/Ccatalyst.After100cycles,t
7、hepeakcurrentofmethanoloxidationforthePtSn/Ccatalystrapidlydecreasedto11%ofitsinitialpeakcurrentbutPtSnCo/Cdecreasedtoonly50%.ThisresultsuggeststhatthePtSnCo/CcatalysthasbetterchemicalstabilityforthecatalysisofmethanoloxidationcomparedtothePtSn/Ccatalyst.Themore
8、negativeonsetpotentialofmethanoloxidationforthePtSnCo/Ccatalystrelativetopre-adsorbedCOoxidationimpliesthattheintermediatesofmethanoloxidationonthePtSnCo/Ccatalystmay
