Ignition and Front Propagation in Polymer Electrolyte Membrane Fuel Cells

Details Ignition and Front Propagation in Polymer Electrolyte Membrane Fuel Cells Ignition and Front Propagation in Polymer Electrolyte Membrane Fuel Cells

2006-06-26

arxiv.org/abs/nlin/0606061v1

Nonlinear Sciences

Pattern Formation and Solitons

Scientific paper

Water produced in a Polymer Electrolyte Membrane (PEM) fuel cell enhances membrane proton conductivity; this positive feedback loop can lead to current ignition. Using a segmented anode fuel cell we study the effect of gas phase convection and membrane diffusion of water on the spatiotemporal nonlinear dynamics - localized ignition and front propagation - in the cell. Co-current gas flow causes ignition at the cell outlet, and membrane diffusion causes the front to slowly propagate to the inlet; counter-current flow causes ignition in the interior of the cell, with the fronts subsequently spreading towards both inlets. These instabilities critically affect fuel cell performance.

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