Three-dimensional study of compressed gas diffusion layers using synchrotron X-ray imaging

被引：107

作者：

Toetzke, C. ^{[1
,2
]}

Gaiselmann, G. ^{[3
]}

Osenberg, M. ^{[2
]}

Bohner, J. ^{[4
]}

Arlt, T. ^{[2
]}

Markoetter, H. ^{[2
]}

Hilger, A. ^{[2
]}

Wieder, F. ^{[1
,2
]}

Kupsch, A. ^{[5
]}

Mueller, B. R. ^{[5
]}

Hentschel, M. P. ^{[5
]}

Banhart, J. ^{[1
,2
]}

Schmidt, V. ^{[3
]}

Lehnert, W. ^{[4
,6
]}

Manke, I. ^{[2
]}

机构：

[1] Tech Univ Berlin, D-10623 Berlin, Germany

[2] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[3] Univ Ulm, D-89069 Ulm, Germany

[4] Forschungszentrum Julich, D-52425 Julich, Germany

[5] BAM Bundesanstalt Mat & Prufung, D-12200 Berlin, Germany

[6] Rhein Westfal TH Aachen, D-52056 Aachen, Germany

来源：

JOURNAL OF POWER SOURCES | 2014年 / 253卷

关键词：

Synchrotron X-ray tomography; Gas diffusion layer (GDL); Microstructure; Water transport path; Pore size analysis; Geometrical tortuosity; WATER TRANSPORT; LIQUID WATER; FUEL-CELLS; RADIOGRAPHY; TOMOGRAPHY; MANAGEMENT;

D O I：

10.1016/j.jpowsour.2013.12.062

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present a synchrotron X-ray tomographic study on the morphology of carbon fiber-based gas diffusion layer (GDL) material under compression. A dedicated compression device is used to provide well-defined compression conditions. A flat compression punch is employed to study the fiber geometry at different degrees of compression. Transport relevant geometrical parameters such as porosity, pore size and tortuosity distributions are calculated. The geometric properties notably change upon compression which has direct impact on transport conditions for gas and fluid flow. The availability of broad 3D paths, which are most important for the transport of liquid water from the catalyst layer through the GDL, is markedly reduced after compression. In a second experiment, we study the influence of the channel-land-pattern of the flow-field on shape and microstructure of the GDL. A flow-field compression punch is employed to reproduce the inhomogeneous compression conditions found during fuel cell assembly. While homogenously compressed underneath the land the GDL is much less and inhomogeneously compressed under the channel. The GDL material extends far into the channel volume where it can considerably influence gas and fluid flow. Loose fiber endings penetrate deeply into the channel and form obstacles for the discharge of liquid water droplets. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：123 / 131

页数：9

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