This title appears in the Scientific Report : 2016 

Simulation of a Full Fuel Cell Membrane Electrode Assembly Using Pore Network Modeling
Aghighi, Mahmoudreza
Höh, Michael / Lehnert, Werner / Merle, Geraldine / Gostick, Jeff (Corresponding author)
Elektrochemische Verfahrenstechnik; IEK-3
Journal of the Electrochemical Society, 163 (2016) 5, S. F384 - F392
Pennington, NJ Electrochemical Soc. 2016
10.1149/2.0701605jes
Journal Article
Fuel Cells
OpenAccess
OpenAccess
Please use the identifier: http://dx.doi.org/10.1149/2.0701605jes in citations.
Please use the identifier: http://hdl.handle.net/2128/9995 in citations.
A pore network model has been applied to a both sides of a fuel cell membrane electrode assembly. The model includes gas transport in the gas diffusion layers and catalyst layers, proton transport in the catalyst layers and membrane, and percolation of liquid water. This paper presents an iterative algorithm to simulate a steady state isothermal cell with a 3D pore network model for constant voltage boundary condition. The proposed algorithm provides a simple method to couple the results of the anode and the cathode sides by iteratively solving the uncoupled equations of the transport processes. It was found that local water blockages at the GDL/CL interface not only affect concentration polarization, but also might change ohmic polarization of the cell. Depending on the liquid water configuration in the porous electrodes, the protons generated in the anode need to travel longer paths to reach the active sites of the cathode; consequently, the IR loss will be increased in the presence of liquid water. This finding highlights the strength of pore network models which resolve discrete water blockages in the electrodes