期刊
JOURNAL OF POWER SOURCES
卷 535, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231381
关键词
PEM fuel cells; X-ray micro-computed tomography; Gas diffusion layers; Heterogeneous PTFE distribution; Lattice Boltzmann method; Liquid water transport
资金
- Fuel Cells and Hydrogen 2 Joint Undertaking [779565]
- European Union
- Hydrogen Europe
- Hydrogen Europe Research
- state of Baden-Wurttemberg through bwHPC
- German Research Foundation (DFG) [INST 40/575-1 FUGG]
Water transport through porous carbon felt gas diffusion layers (GDLs) was simulated using a 3D Color-Gradient Lattice Boltzmann model. The GDL microstructures were reconstructed from high-resolution X-ray micro-computed tomography (μ-CT) and a in-house algorithm was developed to distinguish carbon fibers and polytetrafluoroethylene (PTFE). Capillary hysteresis was investigated by simulating intrusion and drainage curves and comparing them to testbench data.
Water management is crucial for reliable operation of Polymer Electrolyte Membrane Fuel Cells (PEMFC). Here, the gas diffusion layer (GDL) plays an essential role as it has to ensure efficient water removal from and oxygen transport to the catalyst layer. In this study water transport through porous carbon felt GDLs was simulated using a 3D Color-Gradient Lattice Boltzmann model. Simulations were carried out on microstructures of plain and impregnated fiber substrates of a Freudenberg H14. The GDL microstructures were reconstructed from high-resolution X-ray micro-computed tomography (mu-CT). For the distinction of carbon fibers and polytetrafluoroethylene (PTFE) in the binarized microstructures an in-house algorithm was developed. The additive was specified heterogeneously in the GDL through-plane direction employing a PTFE loading profile as derived based on mu-CT image data. In the in-plane direction the additive was furthermore defined in a realistic fashion near carbon fiber intersections. Prior to parametric studies on capillary behavior a sophisticated modeling approach for semipermeable membranes had to be developed to account for experimental boundary conditions. Capillary hysteresis was then investigated by simulation of intrusion and drainage curves and subsequent comparison to testbench data.
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