物理化学学报(WuliHuaxueXuebao)SeptemberActaPhys.-Chim.Sin.,2008,24(9):1643-16491643[Article]www.whxb.pku.edu.cnNi-B非晶态合金电极上乙醇的电氧化及其动力学参数的测定郑一雄1,*姚士冰2周绍民2(1华侨大学材料科学与工程学院,福建泉州362021;2厦门大学化学化工学院,固体表面物理化学国家重点实验室,福建厦门361005)摘要:应用循环伏安法研究了碱性介质中Ni-B非晶态合金纳米粉末微电极和化学镀Ni-B非晶态合金微盘电极上乙醇的电催化氧化.结果表明,Ni-B非晶态合金纳米粉末微电极和化学镀Ni-B非晶态合金微盘电极对碱性溶液中乙醇的氧化均具有很高的电催化作用,且前者的电催化氧化活性高于后者.运用稳态极化曲线测定了Ni-B非晶态合金纳米粉末微电极上乙醇的电催化氧化动力学参数.与高择优取向(220)镍电极比较,碱性介质中Ni-B非晶态合金纳米粉末微电极上乙醇的电催化氧化速率显著提高.采用循环伏安法测定的Ni-B非晶态合金纳米粉末微电极上Ni(OH)2的质子扩散系数高出文献报道的镍纳米线电极和表面化学镀Co的球形Ni(OH)2粉末电极约2个数量级.关键词:Ni-B非晶态合金;纳米颗粒;乙醇;电催化氧化中图分类号:O646ElectrooxidationofEthanolatNi-BAmorphousAlloyElectrodeandMeasurementsofKineticParametersZHENGYi-Xiong1,*YAOShi-Bing2ZHOUShao-Min2(1CollegeofMaterialScienceandEngineering,HuaqiaoUniversity,Quanzhou362021,FujianProvince,P.R.China;2StateKeyLaboratoryforPhysicalChemistryofSolidSurface,CollegeofChemistryandChemicalEngineering,XiamenUniversity,Xiamen361005,FujianProvince,P.R.China)Abstract:ElectrocatalyticoxidationofethanolatthenanoNi-BamorphousalloypowdermicroelectrodeandtheelectrolessNi-Bamorphousalloymicrodiskelectrodeinalkalinemediawasstudiedbyusingcyclicvoltammetry.ItwasfoundthatthenanoNi-BamorphousalloymicroelectrodehadhigherelectrocatalyticactivityfortheoxidationofethanolthantheelectrolessNi-Bamorphousalloymicrodiskelectrode.Thekineticparametersweredeterminedwiththesteadypolarizationcurves.TheratesofelectrocatalyticoxidationofethanolatthenanoNi-Bamorphousalloymicroelectrodeinalkalinemediaweremuchhigherthanthoseatthehighlypreferredorientation(220)nickelelectrode.TheprotondiffusioncoefficientofNi(OH)2atthenanoNi-Bamorphousalloypowdermicroelectrodedeterminedbycyclicvoltammetrywasincreasedbyabout2ordersofmagnitude,incomparisonwiththereportedvaluesatNinanowireelectrodeandthesphericalNi(OH)2microencapsulatedbycobalt.KeyWords:Ni-Bamorphousalloy;Nanoparticle;Ethanol;Electrocatalyticoxidation镍及氧化镍广泛用作碱性电池、碱性介质中电电催化氧化醇类小分子的研究已有报导,Amjad等[1]解水及有机电合成的电极材料.由于镍基氧化镍对采用抛光的多晶镍电极研究其