管状空气自呼吸直接甲醇燃料电池的研制

Development of tubular air-breathing direct methanol fuel cell

制备了一种新型的直接甲醇燃料电池,即管状空气自呼吸直接甲醇燃料电池,采用弯曲热压法制备出管状膜电极。将管状膜电极固定在一个具有导电性能的多孔管上,制作出管状空气自呼吸直接甲醇燃料电池。燃料的供给根据使用目的不同,既可以用泵连续输送,作为固定电源,也可以采用间歇式补充甲醇溶液,作为便携式电源。同时对影响电池性能的因素,如阴极催化剂的用量,甲醇的浓度和甲醇的温度等进行了考察。阴极表面催化剂的用量可以显著地影响电池的功率密度,甲醇溶液的温度也是影响电池性能的一个关键因素。在阳极催化剂的用量为2mg/cm2Pt-Ru,阴极催化剂用量为3mg/cm2Pt,甲醇溶液浓度为4mol/L,温度为80℃时,采用空气自呼吸方式,电池的功率密度达到10mW/cm2。在管的内部一次加入4mol/L的甲醇溶液,在没有任何外围设备时,常温常压下工作,一个10cm2的管状空气自呼吸直接甲醇燃料电池可以稳定提供40mW功率的时间超过5h。

A new type direct methanol fuel cell(DMFC), the tubular air-breathing DMFC has been presented and manufactured. Liquid methanol solution was fed throu gh the inner of tube for stationary power, or filled intermittently for portable power. The factors that affect the performance, such as cathode catalyst loadin g, methanol concentration, and the methanol solution temperature, have been inve stigated. The results indicate that increasing the cathode catalyst loading can significantly improve power density. The temperature of the liquid methanol is a key factor on the power density. The stable power density can reach 10 mW/cm2 u nder the conditions: 2 mg/cm2 Pt-Ru catalyst in the anode, 3 mg/cm2 Pt catalyst in the cathode, and 4 mol/L methanol solution. Once one time adding 4 mol/L met hanol solution in the inner of the tube ,without any peripheral equipment, a 10 cm2 tubular air-breathing direct methanol fuel cell can supply 40 mW above 5 h .