纳米TiO_2-Pt修饰电极的制备、性能及应用  

PREPARATION AND PROPERTIES OF TiO_2/Nano-Pt MODIFIED ELECTRODE AND ITS APPLICATION

作　　者：王凤武[1] 魏亦军[1] 褚道葆[2] 

机构地区：[1]淮南师范学院化学系,安徽淮南232001 [2]安徽师范大学化学与材料科学学院,安徽芜湖241000

出　　处：《化工学报》2004年第5期757-763,共7页CIESC Journal

基　　金：安徽省高校自然科学基金资助项目(No 2 0 0 3KJ2 95 )

摘　　要：采用电化学合成法和电沉积法制备高活性钛基纳米TiO2 Pt(Ti/nano TiO2 Pt)修饰电极 ,通过循环伏安法研究并比较了钛基纳米TiO2 膜电极、纯Pt电极、Ti/nano TiO2 Pt电极在H2 SO4溶液中的电化学行为以及Ti/nano TiO2 Pt电极对Mn2 + 氧化为Mn3 + 的电催化性能 .结果表明纳米TiO2 Pt修饰电极对Mn2 + 的电氧化有高催化活性 .Mn2 + 氧化峰电位为 1 2 8V (vsSCE) ,比纯Pt电极负移 0 12V ;析氧电位为 1 4 0V ,比纯Pt电极高0 0 8V .Ti/nano TiO2 Pt修饰电极催化性能优于纯Pt电极和纳米TiO2 膜电极 ,非均相电解氧化效率可达 90 %以上 .电解得到的Mn3 + 可一步氧化甘油为甘油醛 ,收率为 96 % .The highly active Ti/nano-TiO2-Pt modified electrode was prepared by the methods of electrochemical synthesis and electro-deposition. The cyclic voltammetry was adopted to study and compare the electrochemical properties of the TiO2/nano membrane electrode, single Pt electrode, Ti/nano-TiO2-Pt modified electrode in H2SO4 solution. The electro-catalytic properties of Ti/nano-TiO2-Pt modified was also studied in the process of Mn2+ oxidized to Mn3+. Results showed that Ti/nano-Pt modified electrode had high catalytic activity to Mn2+ and the oxidation beak potential of Mn2+ was 1.28 V (vs. SCE), which is 0.12 V of negative-transferring as compared with that of single Pt electrode. The oxygen-releasing potential was 1.4 V, about 0.08 V higher than that of single Pt electrode. The electro-catalytic properties of Ti/nano-TiO2-Pt modified electrode were better than those of single Pt electrode and Ti/nano electrode, while the efficiency of non-homogenous electrolytic oxidation was over 90%. The Mn3+ prepared by electrolysis could oxidize glycerol to glyceraldehyde, and the yield was 96%.

关 键 词：纳米TiO2-Pt修饰电极 电催化 Mn^3+/Mn^2+ 循环伏安 甘油醛 

分 类 号：O646[理学—物理化学]