G114 デッドエンド式自然給気型燃料電池の両極における凝縮水影響(OS5 水素・燃料電池)

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The methods for smaller and lighter PEFC systems include "Dead-end mode" and "Air-breathing". However, it is difficult to discharge water, and PEFC systems using these methods have agenda that they make it easier to flood. In this paper, we investigated the effect of condensed water on the cell performance experimentally. Shorter operation time and more condensed water were observed at higher relative humidity (RH) and higher current density (0.3A/cm^2) condition than at lower RH and lower current density (0.2A/cm^2). At lower RH and lower current density, it was confirmed that the causes of shutdown are flooding by the condensed water on the channel bottoms at the cathode side and the water on the GDL surface at the anode side. We were able to prevent the cathode flooding by continuous removal of the accumulated water and the anode flooding by less-frequent hydrogen purge.
一般社団法人日本機械学会の論文
2011-06-22