松树枝状双金属Ag-Cu颗粒的制备与电活性.pdf

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1、第26卷第9期无机化学学报Vo1．26No．92010年9月CHINESEJOURNALOFIN0RGANICCHEMISTRY1600．1604松树枝状双金属Ag．Cu颗粒的制备与电活性易清风李磊宋李红牛凤娟(湖南科技大学化学化工学院，湘潭411201)摘要：利用恒电位电解技术，直接从无支持电解质的AgNO，和Cu(NO)混合溶液中，在钛片表面上沉积具有松树枝状结构的双金属Ag．Cu纳米颗粒。SEM图像表明，树枝长度随铜比例的增加而增加；随着电解的不断进行．双金属纳米颗粒直接沉积于树叶顶端，形成花蕊芯状结构。松树枝状结构的形成是Ag+和

2、Cu+的扩散过程与电迁移过程共同作用的结果研究了肼在这种双金属Ag-Cu纳米颗粒上的循环伏安特性，结果表明，肼在这种以钛为基体的树枝状双金属Ag79Cu2，，Ag7Cu29和ACu46纳米电极表面上的吸附为多层吸附，由此建立超低浓度肼的电化学检测法，在1mol·L—NaOH溶液中的检测下限分别为0．0941、0．0369和0．264t~mol·L～。关键词：松树枝状纳米颗粒；双金属Ag—Cu；肼检测；电沉积中图分类号：0614．121；0614．122文献标识码：A文章编号：10014861(2010)09．1600．05Fabricat

3、ionandElectroactivityofPineBranch-LikeBinaryAg—CuNanoparticlesYIQing—FengLILeiSONGLi—HongNIUFeng—Juan(SchoolofChem~tryandChemicalEngineering,HunanUniversityofScienceandTechnology,Xiangtan，Hunan411201)Abstract：FromthemixtureofAgNO3andCu(NO3~withoutsupportingelectrolyte．pin

4、ebranch-likebinaryAg-CunanoparticlesweredepositedontheTisurfaceusingsimplechronoamperometrictechnique．TheirSEMimagesshowthatthelengthofpinebranchesincreaseswithelectro—depositiontimeandcoppercontentinthemixtureofAgNO3andCu(N03)2．Itwasalsoobservedthattheincreaseofelectro—d

5、epositiontimeresultedinthedepositionofbinaryAg-Cunanoparticlesonthetopofpineleavestoformapistil-liketexture．Thepossibleformationmechanismofthepinebranch-likestructurewasrelatedtobothelectro-migrationanddiffusionprocessesofmetalions(Ag+Cu)．Therefore，itwaspossibletocontrolb

6、oththelengthofbranchesandpineleavesbychoosingappropriatecompositionsoftheAgtoCuandelectrodepositiontime．Amulti-layeradsorptionmechanismofhydrazineontheseTi-supportedbinaryAg-Cuelectrocatalystswasproposedaccordingtothecyclicvohammogramsinalkalinesolutions．Anelectrochemical

7、detectionofultra—lowconcentrationofhydrazinewasfoundedonthebasisofcyclicvohammetricmeasurements．Thedetectionlimitsofhydrazinein1mol·L～NaOHatAgv9Cu2~，A1Cu29andAg~4CU46were0．0941．0．0369and0．264txmol·L～respectively．Thepreparedpinebranch-likebinaryAg-Cunanoparticlespresentedh

8、ighstabilityontheTisubstrateinalkalinesolutions．Keywords：pinebranch．-likenanoparticles；binaryAg-