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A new approach to elucidate the operation and control of Polymer Electrolyte Membrane (PEM) fuel cells is being developed. A global reactor engineering approach is applied to PEM fuel cells to identify the essential physics that govern their dynamics. Reaction engineering principles are employed to develop a one-dimensional differential PEM fuel cell suitable for elucidating the dynamic performance of PEM cells under well-defined conditions. This concept is expanded by putting differential elements in series to model complex flow fields.
A more in depth understanding is gained by combining our results from the operating fuel cells with observations of the mechanical properties of Nafion membranes. Creep, water uptake, and stress relaxation are extensively studied with novel instrumentation to give insight into the performance of Nafion in an operatiing fuel cell.
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