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Relating the N-shaped polarization curve of a PEM fuel cell to local oxygen starvation and hydrogen evolution

N. Zamel, A. Bhattarai, D. Gerteisen, U. Groos, C. Hebling
2015

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In this work, we use the polarization curve of a polymer electrolyte membrane (PEM) fuel cell to investigate the interconnected transport processes in its electrodes. The investigation is based on a segmented (7 by 7) PEM fuel cell. A local N-shaped negative differential resistance (N-NDR) branch was measured in the steady state polarization curve of the cell near its oxygen outlet. This phenomenon was also observed in a much more pronounced manner for highlytransient polarization curves on all
more » ... segments. In this study, we show that even despite the cell running under normal conditions, in the case of oxygen starvation, a hydrogen evolution takes place in the cathode catalyst layer. This theory is illustrated through experimental measurements.
doi:10.24406/publica-fhg-388017 fatcat:rjoaci66cjgdnjy6r46umweptm
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N. Zamel, A. Bhattarai, D. Gerteisen, U. Groos, C. Hebling. "Relating the N-shaped polarization curve of a PEM fuel cell to local oxygen starvation and hydrogen evolution." (2015)