摘要
采用电化学合成法和电沉积法制备高活性钛基纳米TiO_2-Pt(Ti/nano-TiO_2-Pt)修饰电极,通过循环伏安法研究并比较了钛基纳米TiO_2膜电极、纯Pt电极、Ti/nano-TiO_2-Pt修饰电极在H_2SO_4溶液中的电化学行为,以及Ti/nano-TiO_2-Pt修饰电极对Mn^(2+)氧化为Mn^(3+)的电催化性能。结果表明,Ti/nano-TiO_2-Pt修饰电极对Mn^(2+)的电氧化有高催化活性,Mn^(2+)氧化峰电位为1.28 V(vs. SCE),比纯Pt电极负移0.12V,析氧电位为1.40 V,比纯Pt电极高0.08 V。Ti/nano-TiO_2-Pt修饰电极的催化性能优于Pt电极和纳米TiO_2膜电极,非均相电解氧化Mn^(2+)生成Mn^(3+)的平均电流效率可达90％以上。
The high active Ti/nano-TiO_2-Pt electrode is prepared by electrochemical synthesis and electrodeposition. The electrochemical behavior of the TiO_2/nano membrane electrode, Pt electrode and Ti/nano-TiO_2-Pt electrode in H_2SO_4 solution have been studied by cyclic voltammetry. The property of Ti/nano-TiO_2-Pt electrode in oxidation of Mn^(2+) to Mn^(3+) is also studied. The results show that the Ti/nano-Pt electrode has high catalytic activity in Mn^(2+) oxidation of 1.28 V(vs. SCE) oxidation potential peak, 0.12 V negative shifted as compared with that occurrs on Pt electrode. The oxygen-releasing potential is 1.4 V, about 0.08 V higher than that of Pt electrode. The electro-catalysis property of Ti/nano-TiO_2-Pt electrode is better than that of the Pt electrode and Ti/nano electrode, it gives a average current efficiency more than 90% in non-homogeneous electrolytical oxidation of Mn^(2+) to Mn^(3+).
出处
《应用化学》
CAS
CSCD
北大核心
2004年第4期378-382,共5页
Chinese Journal of Applied Chemistry
基金
安徽省高校自然科学基金(2003KJ295)
