【摘要】 报道了用研制的Pt-Ru/C催化剂, 采用特殊工艺制备了膜电极, 并组装了直接甲醇质子交换膜单电池系统。考察了电极扩散层制备方法、催化剂层中催化剂、Teflon-C以及Nafion液的用量等电极制备工艺条件以及空气作为氧化剂对单电池性能的影响。结果表明：采用刷涂法制备电极扩散层比喷涂法好，催化剂层中催化剂的优化含量为0.6mg·cm-2，Teflon-C、Nafion液的最佳用量分别为0.3 mg·cm-2、0.5 mg·cm-2。当工作温度为80℃时，输出电压为0.3V，氧气作为阴极气体的输出电流密度为36mA·cm-2；而空气作为阴极气体的输出电流密度为22.5mA·cm-2。膜电极有效面积为9cm2的的液相进样直接甲醇/氧气燃料电池三电池电堆的最大功率为0.285W，此时输出电压为0.7V，输出电流为0.407A；而液相进样直接甲醇/空气三电池电堆的输出电压为0.635V，输出电流为0.252A时，最大功率为0.160W。更多还原

【Abstract】 Using Pt-Ru/C catalyst as anode and cathode catalysts, the membrane electrode assembly was prepared and single direct methanol fuel cell system was installed. The effect of preparation methods of diffusion layer, catalyst content, Teflon-C content and Nafion content in catalyst layer on single cell performance were studied. The results showed that the performance was better in the diffusion layer prepared by paste than by spray; the best catalyst content was 0.6mg·cm-2，while that of Teflon-C, Nafion was 0.3 mg·cm-2 and 0.5 mg·cm-2 respectively。When the working temperature was 80℃ and output voltage was 0.3V，the output current density was 36mA cm-2 with oxygen as cathode oxidant and that was 22.5mA·cm-2 with air as oxidant. The maximum power of liquid-feed direct methanol/oxygen three-cell stack, where available MEA area was 9 mm2, was 0.285W，and its output voltage and current was 0.7V and 0.407A respectively. When air replaced oxygen as oxidant, the stack’s voltage was 0.635V, its current was 0.252A and its maximum power was 0.160W.更多还原