纳米TiO_2-Pt修饰电极的制备及电催化性研究

Preparation and Electrochemical Behavior of Nano-TiO_2 Modified Platinum Electrode

以钛酸丁酯为原料，采用溶胶-凝胶法（sol—gel）制备了纳米TiO2（nano—TiO2）粉末，用FTIR和激光粒度分析仪测定了合成纳米TiO2的红外光谱特征及其粒径；用循环伏安法研究了裸Pt电极和涂膜法制备的Pt／nano—TiO2修饰电极在不同浓度的Mn^2＋溶液中的循环伏安特征。研究结果表明合成的纳米TiO2颗粒粒径为300-400nmTiO2修饰电极对Mn^2＋具有较好的电催化性能。

Nano-TiO2 sample was prepared by sol-gel method using N-butyl titanate as raw material. The characteristics of the infrared spectra （FTIR） and the particle size of the TiO2 samples were determined by FTIR and laser particle size analyzer. The nano-TiO2-modified Ptelectrode （Pt/nanoTiO2） was made by using the dispersion of the TiO2 powder into dispersing and brUshed on the Pt electrode and then dyed forming a film in air under room temperature. The electrochemical behavior of the Pt/nano-TiO2 electrode in Mn^2＋ of different comcentrations were studied by the cyclic voltammetry （CV） technique. The results indicated that the particle size of the nano-TiO2 samples were in the range of 300nm to 400nm and the Pt/nano-TiO2 electrode displayed nice electrochemical catalytic properties.