Study Of Preparation And Electrocatalysis Properties Of TiO₂ Composite Nanostructures

More and more people are paying attention to the direct methanol fuel cells?DMFCs? due to their high energy density, abundant raw material sources, the reduction of fossil fuel consumption, low operating temperature, easily handling liquid fuel and environmentally friendly. Pt and Pt alloy is the best anode catalyst in field of fuel cell fields, but there are some factors which limits its practical applications, such as high cost, easy catalyst poisoning, etc.. The two problems are becoming the research hotspot in the field of fuel cells.As a potential catalyst carrier, TiO₂ has many characteristics such as high stability, resistance for acid and alkali, also, after the formation of nanoporous structure, it has a very high specific surface area. In addition, the surface adsorption of hydroxyl groups will be transferred to adjacent surface of the precious metal catalyst, which can accelerated oxidation the middle products, such as CO, which can furthermore promote poison resistance during the catalyst process. Besides, this can provide more catalyst activity sites, which will improve the catalyst performance. So the advantage of using TiO₂ as a carrier of catalyst is that improve the ability to resist poisoning. Using different structures of Ti O₂ nanomaterials as a carrier of the precious metal catalyst, the research has gradually attracted the attention of the people around world. The advantage of this approach is that on the premise of guarantee matrix activity good reduces the production cost at the same time, makeing its performance to achieve the best state.In this paper, nano-porous structure was prepared by electrochemical dealloying and chemical dealloying of the Ti-Cu amorphous alloy. We used scanning electron microscope?SEM? to characterize the morphology and composition of the nanoporous TiO₂ materials. Samples with ideal nano porous structure were obtained electric catalytic performance. And the cyclic voltammetry?CV? measurements were carried out to illustrate its catalytic performance.The Pt nanoparticles were loaded on the modified nanoporous Ti O₂ by a convenient deposition method. Different amounts of Pt were determined by loading times. According to the XPS analysis, after deposition of Pt, the main components of the surface of Pt/TiO₂ were Pt, SnO₂, TiO₂ and Cu₂O. The Pt/TiO₂ composite electrical catalyst has good electric catalytic activity for methanol. The sample with 6 loaded times under the current condition shows the optimal catalytic properties.