Method of measuring oxygen diffusivity in microporous media
Method of measuring oxygen diffusivity in microporous media
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DOI：
10.1016/j.ijheatmasstransfer.2009.02.032
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发表时间：
2009-07
影响因子：
5.2
通讯作者：
Y. Utaka;Y. Tasaki;Shixue Wang;Toru Ishiji;Shoichi Uchikoshi
中科院分区：
文献类型：
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作者：
Y. Utaka;Y. Tasaki;Shixue Wang;Toru Ishiji;Shoichi Uchikoshi
在pefc中，气体扩散层（gdl）的传质特性与电池性能密切相关。本文提出了一种基于原电池的氧传感器测量微孔介质中氧扩散率的方法。该方法有望用于测量湿条件下微孔介质中的氧扩散率。对两种微孔GDL介质中的氧扩散率进行了评价。实验结果表明，微孔介质中的扩散系数不能仅由孔隙度决定，而可能受到其他因素的影响，如弯曲度。此外，还有一些GDL材料表现出各向异性扩散。
It is known that the mass transfer characteristics of gas diffusion layers (GDLs) are closely related to cell performance in PEFCs. In this study, a method for measuring oxygen diffusivity in microporous media by means of an oxygen sensor based on a galvanic cell has been developed. This method is expected to be useful for measuring oxygen diffusivity in microporous media in a wet condition. Oxygen diffusivity in two kinds of microporous GDL media was evaluated. Experimental results indicate that diffusivity in microporous media cannot be determined on the basis of porosity alone, but that it may be influenced by some other factor, such as tortuosity. Additionally, there are some GDL materials that exhibit anisotropic diffusivity.