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首页> 外文会议>Polymer electrolyte fuel cells symposium;Meeting of The Electrochemical Society >In Situ Humidity Measurements at the CL Surface by MEMS-based Sensors
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In Situ Humidity Measurements at the CL Surface by MEMS-based Sensors

机译：基于MEMS的传感器在CL表面的原位湿度测量

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Water management is essential for optimizing the performance of proton exchange membrane fuel cells. Then for measuring the local humidity inside membrane electrode assembly (MEA), the thin film humidity sensors (TFHS) are fabricated by the micro-electro-mechanical systems (MEMS) based techniques. The sensor was placed between the catalyst layer (CL) and the microporous layer (MPL) at the cathode. The sensor thickness is only about 9 μm, and the slight effects on total cell performance were observed with the insertion of it. In-situ measurement with a humidity sensor showed the capacitance and RH increased with the increase of the current density linearly up to 0.3 A/cm~2. The capacitance change became moderate in the region of current density 0.3 A/cm~2, because the relative humidity reached 100% at the 0.3 A/cm~2 and water started to accumulate.
机译：水管理对于优化质子交换膜燃料电池的性能至关重要。然后，为了测量膜电极组件（MEA）内部的局部湿度，通过基于微机电系统（MEMS）的技术制造了薄膜湿度传感器（TFHS）。传感器放置在阴极处的催化剂层（CL）和微孔层（MPL）之间。传感器的厚度仅为约9μm，插入传感器后，对总电池性能的影响很小。湿度传感器的原位测量结果表明，随着电流密度的增加，电容和相对湿度线性增加，达到0.3 A / cm〜2。电容变化在电流密度0.3 A / cm〜2的区域变得适中，这是因为相对湿度在0.3 A / cm〜2时达到100％，并且水开始积聚。

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