Embedded flexible micro-sensors in MEA for measuring temperature and humidity in a micro-fuel cell
Embedded flexible micro-sensors in MEA for measuring temperature and humidity in a micro-fuel cell
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DOI：
10.1016/j.jpowsour.2008.01.020
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发表时间：
2008-07-01
影响因子：
9.2
通讯作者：
Wu, Guan-Wei
中科院分区：
文献类型：
--
作者：
Lee, Chi-Yuan;Hsieh, Wei-Jung;Wu, Guan-Wei
在这项调查中，柔性传感器嵌入在膜电极组件（MEA）制造测量的温度和湿度的微型燃料电池。燃料电池性能由MEA的温度和湿度决定。对传感器体积的限制使得在先前的研究中仅在燃料入口和出口处测量MEA的温度和湿度。因此，使用微机电系统（MEMS）制造技术制造柔性微薄膜传感器。薄膜柔性传感器为2 μ π ι厚。温度和湿度传感器的面积分别为180 μ m × 180 μ m和180 μ m × 220 μ m。使用湿蚀刻技术，将流动通道集成在具有300 μ m宽和200 μ m深的微通道的不锈钢基底（SS-304）中。这项研究揭示了利用柔性薄膜传感器与微型燃料电池测量局部温度和湿度的MEA的可行性。我们发现MEA和双极板外表面之间的最大温差为5.7 ℃。单电池的最佳性能曲线在50 ℃、75%RH和H2/O2气体流量为50 ml min（-1）时获得。当电池电压为0.45 V时，燃料电池的最大功率密度为358 mW cm（-2），电流密度为796 mA cm（-2）。
In this investigation, flexible sensors embedded in a membrane electrode assembly (MEA) are fabricated to measure the temperature and humidity of a micro-fuel cell. Fuel cell performance was determined by the temperature and humidity of the MEA. Restrictions on the sensor volume are such that in previous investigations the temperature and the humidity of the MEA have been measured only at the fuel inlet and outlet. Hence, flexible micro-thin film sensors were fabricated using micro-electro-mechanical systems (MEMS) fabrication technology. The thin film flexible sensor was 2 pm thick. The temperature and humidity sensors had areas of 180 mu m x 180 mu m and 180 mu m x 220 mu m, respectively. A flow channel was integrated in a stainless-steel base (SS-304) with micro-channels that are 300 mu m wide and 200 mu m deep using wet-etching technology. This study reveals the feasibility of utilizing flexible thin film sensors with micro-fuel cells to measure local temperature and humidity in an MEA. We found that the maximum temperature difference between MEA and the outer surface of a bipolar plate is 5.7 degrees C. The optimal performance curves of the single cell are obtained at 50 degrees C, 75%RH and H-2/O-2 gas flow rates of 50 ml min(-1). The maximum power density of the fuel cell was 358 mW cm(-2) and the current density was 796 mA cm(-2) when the cell voltage was 0.45 V. (c) 2008 Elsevier B.V. All rights reserved.