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1、聚邻苯二胺负载纳米铜氧化物修饰玻碳电极的制备及表征刘有芹1,乐文志1,薛峰峰2,颜??芸1,徐??莉1(1??华南农业大学理学院应用化学系,广州510642;2??河北工程技术高等专科学校,沧州061001)摘要????在磷酸盐缓冲溶液中于玻碳电极表面聚合邻苯二胺,再负载纳米铜氧化物,成功制备了邻苯二胺负载纳米铜氧化物修饰玻碳电极(CuO/P??oPD/GC)。探讨了聚合和负载机理,用电化学交流阻抗谱表征了修饰电极界面的阻抗变化,用扫描电镜表征了聚邻苯二胺膜和负载铜氧化物后的表面形态,发现CuO/
2、P??oPD/GC电极对H2O2有显著的电催化氧化、还原双重活性,并呈现??协同增敏效应。考察了制备条件对CuO/P??oPD/GC电极电催化活性的影响,最佳CuO负载扫描次数为20,Cu2+的质量浓度为1.67mmol/L。对H2O2电催化氧化的线性方程为??ipa(??A)=0.08+5.64c(mmol/L)(R=0.9982),线性范围为2.4!10-2~48mmol/L,检测限为2.8!10-3mmol/L(3S/k);电催化还原的线性方程为??ipc(??A)=0.11-2.45c(m
3、mol/L)(R=0.9820),线性范围为2.4!10-3~38.4mmol/L,检测限为2.0!10-4mmol/L(3S/k)。该复合材料修饰电极的灵敏度高、稳定性好,用于实际水样中H2O2测定结果满意。关键词????邻苯二胺??铜氧化物??玻碳电极??过氧化氢??电催化中图分类号:O631.1;O657.1;O646.5??????????文献标识码:APreparationofNano??copperOxideLoadedPoly??o??phenylenediamineM———————
4、——————————————————————————————————————————————odifiedGlassyCarbonElectrodeandItsCharacterizationLIUYouqin,LEWenzhi,XUEFengfeng,YANYun,XULi2??HebeiEngineeringandTechnicalCollege,Cangzhou061001)—————————————————————————————————————————————————————Abstra
5、ct????Anano??copperoxideloadedpoly??o??phenylenediaminefilmmodifiedglassycarbonelectrode(CuO/P??oPD/GC)issuccessfullyprepared.First,thepoly??o??phenylenediaminefilmispolymerizedonGCelectrodesurfaceinphosphatebuffersolutionbycyclicvoltammetry,andthenth
6、enano??copperoxideisloadedinP??oPDfilm.Themecha??nismofpolymerizationandloadingisdiscussed.TheimpedancechangesofGCelectrodesurfaceduringthemodifica??tionprocessarecharacterizedbyelectrochemicalACimpedancespectroscopy,andthesurfacemorphologyofpoly??o??
7、phenylenediaminefilmandnano??CuOloadedpoly??o??phenylenediaminefilmarecharacterizedbyscanningelectronmi??croscope.TheresultsshowthattheCuO/P??oPD/GCelectrodehassignificantdualactivitytowardtheelectrocatalyticoxidationandreductionofH2O2,findingthatCuOa
8、ndP??oPDshowsynergisticeffect.Thefactorsinfluencingtheelectro??catalyticactivityofCuO/P??oPD/GCelectrodeareinvestigated,showingthattheoptimalscanningnumberis20andCu2+concentrationis1.67mmol/L.ThelinearregressionequationforH2O2oxidationis??ipa(
