纳米TiO2-Pt修饰电极的制备、性能及应用

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H₂SO₄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1.28 V（vs SCE），比纯Pt电极负移0.12 V；析氧电位为1.40 V，比纯Pt电极高0.08 V.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%.

PREPARATION AND PROPERTIES OF TiO2/Nano-Pt MODIFIED ELECTRODE AND ITS APPLICATION

The highly active Ti/nano-TiO_2-Pt modified electrode was prepared by using the method of electrochemistry synthesis and electro-deposition. The cyclic voltammetry was adopted to study and compare the electrochemical properties of the TiO_2/nano membrane electrode,single Pt electrode,Ti/nano-TiO_2-Pt modified electrode in H_2SO_4 solution.The electro-catalysis properties of Ti/nano-TiO_2-Pt modified was also studied in the process of Mn 2 oxidized to Mn 3 . Results showed that Ti/nano-Pt modified electrode had high catalystic activity to Mn 2 and oxidation beak potential of Mn 2 was 1.28 V( vs . SCE),which is 0.12 V of negative-transfering 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-catalysis properties of Ti/nano-TiO_2-Pt modified electrode were better than those of single Pt electrode and Ti/nano electrode,while the efficiency of non-homogenous electrolysis oxidation was over 90%. The Mn 3 propared by electrolysis could oxidize glycerol to glyceraldehyde,and the yield was 96%.