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Development of in-situ X-ray Imaging Technologies for Measuring Water Distribution in Generating PEFC

Article of Honda R&D Technical Review Vol.23 No.1

Summary

Water management in fuel cells is a key technology for enhancing the performance and durability of polymer electrolyte fuel cells (PEFC), and water transport phenomena in PEFC have to be clarified.
In-situ measurement techniques in generating PEFC using X-ray computed tomography (CT) and X-ray radiography were developed, and water transport phenomena in the Gas Diffusion Layer (GDL) and gas channels were analyzed.
The water inside the GDL was observed to increase in accordance with the current density, and it was also observed that water is discharged from the GDL to the channels along the hydrophilic channel wall surfaces. In addition, image processing was performed, and the water distribution inside the GDL during generation was quantitatively evaluated. The results confirmed that a large amount of water easily accumulates in the GDL under the rib.

Reference

(1) Hussey, D. S., Jacobson, D. L., Arif, M., Owejan, J. P., Gagliardo, J. J., Trabold, T. A.: Neutron images of the through-plane water distribution of an operating PEM fuel cell, Journal of Power Sources, Vol. 172, Issue 1, p.225-228 (2007)
(2) Teranishi, K., Tsushima, S., Hirai, S.: Analysis of Water Transport in PEFCs by Magnetic Resonance Imaging Measurement, Journal of Electrochemical Society, 153, A664-A668 (2006)
(3) Pasaogullari, U., Wang, C. Y.: Two-phase Modeling and Flooding prediction of Polymer Electrolyte Fuel Cells, Journal of Electrochemical Society, 152, A380-A390 (2005)
(4) Sinha, P. K., Halleck, P., Wang, C. Y.: Quantification of Liquid Water Saturation in a PEM Fuel Cell Diffusion Medium Using X-ray Microtomography, Electrochemical & Solid-State Letters, Vol. 9, A344-348 (2006)
(5) Maeda, M., Isogai, Y., Shiozawa, M., Tejima, T., Hamada, J.: Analysis of water distribution in a fuel cell using x-ray computed tomography, Denso technical review, Vol. 13, No. 1, p. 37-43 (2008)
(6) Kak, A. C., Slaney, M.: Principles of Computerized Tomographic Imaging, IEEE Press (1988)

Author (organization or company)

Koji MORIYAMA(Automobile R&D Center)、Takahiro TACHIHARA(Automobile R&D Center)、Toru FURUSAWA(Fundamental Technology Research Center)

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