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电催化剂是质子交换膜燃料电池中非常重要的关键材料。文中详细地介绍了大连化学物理研究所燃料电池工程中心所研制的高分散度Pt/C催化剂的制备和表征结果 ,采用这种Pt/C催化剂组装了 5kW的电池组 ,电池组良好的性能验证了催化剂的高活性。为了提高催化剂的利用率 ,文中研究了催化剂分散度和电池性能的关系。研究表明阳极侧催化剂分散度越高对提高电池的性能越有利 ,而在阴极侧Pt分散度的增加对电池的性能影响不大 ,这是因为反应界面上Pt分散度增加后降低了氧还原反应的比活性。
Electrocatalysts are very important key materials in proton exchange membrane fuel cells. The preparation and characterization of highly dispersed Pt / C catalysts developed by the Fuel Cell Engineering Center of Dalian Institute of Chemical Physics are introduced in detail in this paper. A 5kW battery pack is assembled using this Pt / C catalyst. The battery pack has good performance verification High activity of the catalyst. In order to improve the utilization of the catalyst, the relationship between the catalyst dispersion and the battery performance was studied. The results show that the higher the anode catalyst dispersion is, the better the battery performance is, while the increase of Pt dispersion on the cathode side has little effect on the performance of the battery because the reduction of Pt dispersion on the reaction interface decreases the oxygen reduction reaction Specific activity.