中文摘要：

尝试将TiO2纳米管掺杂到应用于直接乙醇燃料电池阳极的低铂Pt-Sn/C催化剂中。采用电化学循环伏安扫描技术考察了其乙醇氧化活性,确定加入TiO2纳米管的最佳用量,同时结合X射线衍射和X射线光电子能谱对电催化机理进行初步分析。结果表明,掺杂TiO2纳米管后,Pt-Sn/C催化剂中Pt的晶格参数进一步扩张,并部分形成了Pt3-Sn结构。TiO2纳米管表面的羟基和吸附态氧,提供了更多含氧物种,使得更多的氧与金属成键,参与乙醇氧化中间产物的进一步氧化反应,提高了催化剂的抗毒化性能,加速铂表面活性位的再生,从而提高催化剂的乙醇氧化能力。

英文摘要：

TiO2 nanotube（TiO2NT） was added into low-platinum Pt-Sn/C electrocatalyst for direct ethanol fuel cell anode.The electrocatalytic activity for ethanol oxidation was evaluated by cyclic voltammetry technique,and the best proportion of TiO2NT was determined.Combined with the results of X-ray diffraction and X-ray photoelectron spectroscopy,the electrocatalytic mechanism of Pt-Sn-TiO2NT/C was analyzed.The results show that the lattice parameter of Pt becomes larger as TiO2NT is added and Pt3-Sn structure may be formed.More oxygen species are donated by the hydroxyl group and the absorbed oxygen species on TiO2NT surface to combine with metal,which can oxidize CO species for further ethanol oxidation.The electric potential difference between ethanol oxidation peak and further ethanol oxidation peak is also increased.A part of the hydroxyl groups for combination with Pt are absorbed on TiO2NT surface,which accelerates the regeneration of the electrochemical active sites of Pt and improves the ethanol oxidation reaction performance of the catalysts.