环境对自呼吸式MEMS微型H2/空气质子交换膜燃料电池的影响

利用MEMS技术制备了一种自呼吸式微质子交换膜燃料电池(PEMFC),阳极采用点蛇混合结构,阴极采用双层镂空微流场结构,阴极靠近膜电极侧微孔尺寸从5～50m不等。鉴于自呼吸式电池的性能受环境的影响很大,本文着重研究了环境湿度和温度对电池性能的影响。结果表明阴极微孔尺寸为11m和15m的电池孔径适度,在环境20℃、30%-70%RH时两电池的极限电流密度(Jmax)和峰值功率密度(Pmax)均表现出较高值,性能良好;阴极微孔尺寸为11m的电池在空气维持50%RH下,温度由10℃升到40℃时Pmax逐渐增大,增幅达14.9%;若不维持空气湿度而改变温度,则温度由10℃升高到40℃时Pmax先增大后减小,20℃时达最大。

Effect of ambient conditions on the air-breathing MEMS H2/Air micro PEM fuel cells

A PEMFC was designed and fabricated with the microelectromechanical system (MEMS) tech-nology. The anode has a pin-serpentine-combined flew field and the cathode has two layers with small channels flew field for air - breathing. The pore size of small channels near the MEA ranges from 5 m to 50 m. This paper focuses on the effects of relative humidity and temperature on fuel cell performance. Results show that PEMFCs with llm and 15 m micro -pore in cathodes performs well at 20℃ and 30-70% RH. When air humidity is controlled at 50% RH, the peak power ( P_max) of PEMFC with 11 m mi-cro - pore in cathode went up by 14. 9% when temperature rose from 10℃ to 40℃. In contrast, when doing the same thing without air humidity control, P_(max) first increased to the maximum at 201 and then decreased.