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J Synchrotron Radiat. 2013 Mar;20(Pt 2):286-92. doi: 10.1107/S0909049513001659. Epub 2013 Feb 8.

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

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1
Center for Biofluid and Biomimic Research, Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja Dong, Namgu, Pohang, Republic of Korea.

Abstract

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.

KEYWORDS:

X-ray tomography; freeze-and-thaw cycle; gas diffusion layer; polymer electrolyte fuel cell; porosity distribution

PMID:
23412485
DOI:
10.1107/S0909049513001659
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