TY  - JOUR
A1  - Tötzke, Christian
A1  - Manke, Ingo
A1  - Gaiselmann, Gerd
A1  - Bohner, John
A1  - Müller, Bernd R.
A1  - Kupsch, Andreas
A1  - Hentschel, Manfred P.
A1  - Schmidt, Volker
A1  - Banhart, Jens
A1  - Lehnert, Werner
T1  - A dedicated compression device for high resolution X-ray tomography of compressed gas diffusion layers
JF  - Review of scientific instruments : a monthly journal devoted to scientific instruments, apparatus, and techniques
N2  - We present an experimental approach to study the three-dimensional microstructure of gas diffusion layer (GDL) materials under realistic compression conditions. A dedicated compression device was designed that allows for synchrotron-tomographic investigation of circular samples under well-defined compression conditions. The tomographic data provide the experimental basis for stochastic modeling of nonwoven GDL materials. A plain compression tool is used to study the fiber courses in the material at different compression stages. Transport relevant geometrical parameters, such as porosity, pore size, and tortuosity distributions, are exemplarily evaluated for a GDL sample in the uncompressed state and for a compression of 30 vol.%. To mimic the geometry of the flow-field, we employed a compression punch with an integrated channel-rib-profile. It turned out that the GDL material is homogeneously compressed under the ribs, however, much less compressed underneath the channel. GDL fibers extend far into the channel volume where they might interfere with the convective gas transport and the removal of liquid water from the cell. (C) 2015 AIP Publishing LLC.
Y1  - 2015
U6  - https://doi.org/10.1063/1.4918291
SN  - 0034-6748
SN  - 1089-7623
VL  - 86
IS  - 4
PB  - American Institute of Physics
CY  - Melville
ER  -