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1、物理化學(xué)學(xué)~(WuliHuaxueXuebao1JanuaryActaPhys.一C.Sin.2014,30(1),83—8783[Article]doi:10.3866/PKU.WHXB201311012www.whxb.pku.edu.cn中空介孔三氧化鎢微球載鈀催化劑的甲酸氧化電催化性能周陽胡仙超。,‘李立清陳喜蓉(江西理工大學(xué)鎢資源高效開發(fā)及應(yīng)用技術(shù)教育部工程研究中心,江西贛州341000;江西理工大學(xué)冶金與化學(xué)工程學(xué)院,江西贛州341000;浙江工業(yè)大學(xué)分析測試中心,杭州310032)摘要:采用噴霧干燥法和焙燒處理制備中空介孔三氧化鎢微球(HMTTS),在其表面進(jìn)
2、一步負(fù)載活性成分Pd。得到納米Pd/HMTTS復(fù)合催化劑.采用X射線粉末衍射(XRD)、掃描電鏡(SEM)和透射電鏡(TEM)等對催化劑的形貌和晶型結(jié)構(gòu)進(jìn)行了表征.結(jié)果表明,Pd納米粒子為面心立方晶體結(jié)構(gòu),均勻地分布在HM1_rS表面.采用循環(huán)伏安和計(jì)時電流法研究了在酸性溶液中Pd/HMTTS催化劑對甲酸的電催化氧化性能,結(jié)果表明Pd/HMTTS催化劑比普通的三氧化鎢載鈀催化劑(PdANO。)對甲酸呈現(xiàn)出更高的電催化氧化活性和穩(wěn)定性.HM1_rS獨(dú)特的中空介孔結(jié)構(gòu)和表面特性以及氫溢流效應(yīng)有利于甲酸在鈀表面的直接脫氫氧化過程的發(fā)生.關(guān)鍵詞:直接甲酸燃料電池;甲酸氧化:三氧化鎢
3、:電催化:介孔材料中圖分類號:0646PalladiumNanoparticlesSupportedonHollowMesoporousTungstenTrioxideMicrosphereasEIectrOcatalystforFormicAcidOxidationZHOUYang’HUXian-Chao?!疞ILi-QingCHENXi-Rong(。EngineeringResearchCenterofHigh-EficiencyDevelopmentandApplicationTechnologyofTungstenResources,JiangxiUniversit
4、yofScienceandTechnology,Ganzhou34100~JiangxiProvince,R.China;MetallurgicalandChemicalEngineeringInstitute,JiangxiUniversityofScienceandTechnology,Ganzhou34100~JiangxiProvince,PR.China;3ResearchCenterofAnalysisandMeasurement,ZhejiangUniversityofTechnology,Hangzhou310032,R.China、Abstract:Hol
5、lowmesoporoustungstentrioxidemicrosphere(HMTTS)wassynthesizedbyspaydryingmethodandemployedasthesuppo~materialforPdcatalyst.ThecatalystwascharacterizedbyX.raypowderdiffraction(XRD),scanningelectronmicroscopy(SEM),andtransmissionelectronmicroscopyfTEM).ThePdnanopa~icleshadaface-centeredcubic
6、crystalstructureandwerewelIdispersedontheexternalwallsofHMTTS.Theas-preparedPd/HMTTScatalystexhibitshigherelectrocatalyticactivityandgoodstabilityduringformicacidoxidationincomparisontoPd/WO3catalyst.TheenhancedcatalyticperformanceisattributedtotheuniquestructureandsurfacepropertiesofHMTTS
7、andthehydrogenspillovereffectwhichgreatlyacceleratesthedirectdehydrogenationofformjcacidonpalladium.KeyWords:Directformicacidfuelcell;Formicacidoxidation;Tungstentrioxide;Electrocatalyst;Mesoporousmaterial1lntroductionadvantages,suchaslesstoxicity,lesspoisonin