【摘要】 以本征型导电高分子材料为催化剂,通过催化光化学还原反应,在聚吡咯/Nafion复合膜上沉积了低当量、高氧气催化还原效率的催化剂铂(20～50μg/cm2)。采用静态和旋转圆盘电极的循环伏安方法,研究不同沉积条件对还原反应影响的基础上,同时实现了较低的铂当量(30μg/cm2)下较高的氧气催化还原活性(极限还原电流8mA/cm2)。该复合膜有望成为氧气直燃型聚合物膜燃料电池的理想阴极膜。更多还原

【Abstract】 Platinum （Pt） based electro-catalytic films for oxygen reduction reaction were prepared by photochemical deposition of Pt particles on the surface of Polypyrrole/Nafion^ composite film. Polypyrrole was used as a convenient catalyst for the photochemical deposition of Pt particles and a low Pt loading （from 20 to 50μg/cm²） on the film was yielded thereafter. Cyclic voltammograms of glassy carbon based static electrodes and rotating disc electrodes （RDEs） were adopted to investigate the influences of different photo depositing conditions, and RDEs were also used for affirmation of the efficiency of oxygen reduction on the catalytic films. Even at low platinum loading （30μg/cm²）, a high limiting oxygen reduction current （8mA/cm²） was achieved by koutechy-levich analysis of the RDEs result. The composite film can be widely used as cathode membrane, which exhibits high oxygen reduction propriety for polymer electrolyte fuel cell.更多还原