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首页> 外文期刊>The International Journal of Environmental Studies >Experimental diagnostics of PEM fuel cells
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Experimental diagnostics of PEM fuel cells

机译：PEM燃料电池的实验诊断

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摘要

In this study, water removal techniques were experimentally developed as a diagnostic tool for the investigation of polymer electrolyte membrane (PEM) fuel cell performance in order to achieve consistent, reliable and repeatable performance. The three water removal methods developed include cell orientation, cell shaking and hydraulic permeation, and instantaneous improvement in the fuel cell performance had been observed when these methods were employed. All the experiments were carried out with a single PEMFC with the active surface area of 50 cm~2. Pure hydrogen was used as fuel and air was used as oxidant. It was found that operating the fuel cell at an orientation of 45 degrees towards gas outlet ports helped removing trapped liquid water from the cathode side; when cell assembly was shaken during the fuel cell operation, liquid water was observed to be removed from the cell structure and cell performance was improved. Water removal by hydraulic permeation was achieved by maintaining the pressure of hydrogen stream 10 kPa lower than that of air stream, which helped water removal by the anode gas stream. It was observed that the simultaneous application of these water removal methods allowed the test results obtained to be consistent, reliable and repeatable, and in general it increased the performance by 25% in ohmic polarization region and 30% in mass transport dominant region. Then these methods were applied to investigate the effects of the various operating conditions on the performance of the PEM fuel cell, including the effect of reactants temperature, pressure, stoichiometry, humidification and cell aging.
机译：在这项研究中，通过实验开发了除水技术，作为研究聚合物电解质膜（PEM）燃料电池性能的诊断工具，以实现一致，可靠和可重复的性能。开发的三种除水方法包括电池定向，电池振动和水力渗透，当使用这些方法时，已观察到燃料电池性能的瞬时改善。所有的实验都是用单个PEMFC进行的，其有效表面积为50 cm〜2。纯氢用作燃料，空气用作氧化剂。已经发现，使燃料电池朝着排气口成45度角的方向操作有助于从阴极侧清除残留的液态水。当在燃料电池操作期间摇动电池组件时，观察到从电池结构中除去了液态水，并且改善了电池性能。通过将氢气流的压力保持在比空气流低10 kPa的压力，可以实现水力渗透除水，这有助于阳极气流除水。观察到，同时应用这些除水方法可使所获得的测试结果一致，可靠和可重复，并且通常在欧姆极化区域将性能提高25％，在质量传输主导区域将性能提高30％。然后将这些方法应用于研究各种操作条件对PEM燃料电池性能的影响，包括反应物温度，压力，化学计量，加湿和电池老化的影响。

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