Quantitative visualization of a gas diffusion layer in a polymer electrolyte fuel cell using synchrotron X-ray imaging techniques

被引:6
|
作者
Kim, Seung Gon [1 ]
Lee, Sang Joon [1 ]
机构
[1] Pohang Univ Sci & Technol, Ctr Biofluid & Biomim Res, Dept Mech Engn, Pohang 790784, South Korea
关键词
polymer electrolyte fuel cell; gas diffusion layer; porosity distribution; freeze-and-thaw cycle; X-ray tomography; POROSITY DISTRIBUTIONS; PERMEABILITY; TOMOGRAPHY;
D O I
10.1107/S0909049513001659
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A gas diffusion layer (GDL) in a polymer electrolyte fuel cell (PEFC) is quantitatively visualized using synchrotron X-ray micro-computed tomography. For three-dimensional reconstruction, an adaptive threshold method is used. This method is compared with the conventional method, i.e. Otsu's method. Additionally, the spatial and temporal variations of the porosity distribution of the GDL under freeze-and-thaw cycles are investigated experimentally. The freeze-and-thaw cycles are established simply using a CRYO system and light source illumination, respectively. Structural defects are found to largely affect the porosity of the GDL. In addition, a cyclic porosity variation is observed in the GDL under freeze-and-thaw cycles. The heterogeneous porosity is irreversibly decreased with the progress of repetitive cycles.
引用
收藏
页码:286 / 292
页数:7
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