乙二醛在Ti/纳米TiO_2-Pt修饰电极上的电催化氧化  

Electrocatalytic Oxidation of Glyoxal on Ti/NanoTiO_2-Pt Modified Electrode

作　　者：褚道葆[1] 何建国[1] 侯源源[1] 徐迈[1] 王树西[1] 王建[1] 查龙武[1] 张雪娇[1] 

机构地区：[1]安徽师范大学化学与材料科学学院,安徽省功能性分子固体重点实验室,分子基材料重点实验室,安徽芜湖241000

出　　处：《物理化学学报》2009年第7期1434-1438,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20476001);安徽省自然科学基金(070414160);高校自然科学重点基金(KJ2007A010)资助~~

摘　　要：采用溶胶-凝胶和电沉积法制备Ti基纳米TiO2-Pt(Ti/纳米TiO2-Pt)修饰电极.X射线衍射(XRD)表明纳米TiO2为锐钛矿型,扫描电镜(SEM)显示Pt纳米粒子在纳米TiO2多孔膜的表面呈现簇分散状态,平均粒径约25nm.通过循环伏安(CV)和计时电流法研究了Ti/纳米TiO2-Pt修饰电极对乙二醛直接电氧化的电催化活性,结果表明,修饰电极对乙二醛的直接电氧化呈现良好的催化活性,在0.60和1.23V(vsSCE)出现两个氧化峰,二者电流密度分别为16和42mA·cm-2,约为纯Pt电极的2倍和1.5倍,反应过程受浓差扩散控制.A nano-TiO2 film electrode loaded with Pt nanoparticles （Ti/nanoTiO2-Pt） was prepared by a sol-gel method and electrochemical deposition technique. The formation of an anatase phase of TiO2 was confirmed by X-ray diffraction （XRD）. Scanning electron microscopy （SEM） images showed that cluster scattered state Pt particles were distributed on the surface of the multi-nanoporous TiO2 film and the average particle size of Pt particles was about 25 nm. The electrocatalytic oxidation of glyoxal on the Ti/nanoTiO2-Pt modified electrode was investigated by cyclic voltammetry （CV） and chronoamperometry. The results showed that the Ti/nanoTiO2-Pt modified electrode exhibited significant electrocatalytic activity for the oxidation of glyoxal. The oxidation peak potentials were 0.60 and 1.23 V （vs SCE （saturated calomel electrode））. Current densities were 16 and 42 mA. cm-2, respectively, and they were about 2 and 1.5 times as high as those of a pure Pt electrode. The reaction process was controlled by concentration diffusion.

关 键 词：电催化 Ti/纳米TiO2-Pt修饰电极 直接氧化 乙二醛 乙醛酸 

分 类 号：O646.54[理学—物理化学]