Synthsis Of The Anodic Catalyst Of The Pt-La₂O₃-TiO₂/C And Its Electrochemical Performance In The Fuel Cell

The direct methanol fuel cell (DMFC) shows many advantages, included the rich fuel sources of methanol, easy to be transported and so on. However, there are still a lot of problems need to be solve before this kind of fuel cell can be applied, one of them is that the Pt catalysts possess low electrocatalytic activities for the methanol oxidation and easy poisoned by the intermediate products of the methanol oxidation. This dissertation studied the electrocatalytic activities and the performance of the anti-carbon monoxide poisoning of the Pt-La₂O₃-TiO₂/graphite anodic catalysts in several kinds of solution systems.Firstly, several kinds of rare-earth elements doped Pt-TiO₂/graphite anodic catalysts were prepared by the combining method of the sol-gel and electrodeposition method. XRD, AFM, SEM, and EDX and other modern techniques were employed to study the relationship among the synthesis condition, surface composition on the electrode surface and electrochemical performance. The experimental results show that the Pt-La₂O₃-TiO₂/graphite anodic catalyst possesses good electrocatalytic activities and the performance of the anti-carbon monoxide poisoning. La₂O₃ found can improve the stability of electrocatalytic activities of the Pt-TiO₂/graphite anode in the long-term test.Secondary, the Pt-La₂O₃-TiO₂/graphite anodic catalyst was firstly applied in the solution systems of the CH₃OH, HCHO, HCOOH and C₂H₅OH. Several modern techniques were applied to measure the physicochemical performance of Pt-La₂O₃-TiO₂/graphite anodic catalyst in the solution systems. The experimental results show that the Pt-La₂O₃-TiOz/graphite anodic catalyst possesses high electrocatalytic activities and stabilities in the oxidation of CH₃OH, HCHO, HCOOH and C₂H₅OH. Above studies increase the application field of the Pt-La₂O₃-TiO₂/graphite anodic catalyst in the field of fuel cell.