Pt/TiO_2-NTs复合材料的制备及其甲醇电氧化机理研究

Study on Synthesis of Pt/TiO_2-NTs and the Mechanism for Methanol Electro-oxidation

采用水热法合成锐钛矿型TiO2纳米管(TiO2-NTs),并以其为载体制备了Pt/TiO2-NTs复合材料。用TEM、XRD对复合材料的形貌和结构进行了表征,TEM测试表明Pt纳米粒子以簇状形式均匀地分散在TiO2纳米管表面。运用循环伏安法研究了Pt/TiO2-NTs复合材料在不同条件下对硫酸中甲醇的电催化活性,并讨论了甲醇的电氧化机理。结果表明,Pt/TiO2-NTs复合材料具有出色的电催化活性。因此,TiO2-NTs被认为是非常有潜力的燃料电池贵金属催化剂载体材料。

Anatase TiO2 nanotubes were prepared by a hydrothermal method and Pt/titanium dioxide nanotubes （Pt/TiO2-NTs） composites were successfully prepared through a simple reductive process. The morphology and structure of the resulting composites were characterized by transmission electron microscopy and X-ray diffraction. TEM results show that Pt nanoparticles in nanoclusters morphology are well dispersed on the surface of TiO2-NTs. Electro-oxidation of methanol in sulfuric acid solution was studied by CV in detail for Pt/TiO2-NTs composites. The results indicate that Pt/TiO2-NTs have excellent electrocatalytic activity. The mechanism for methanol electro-oxidation was also discussed. The results imply that TiO2-NTs are very promising supporting material for noble metal catalysts.