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Analysis of the performance of an open-cathode polymer electrolyte fuel cell stack using |
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Abstract
In this study, an analysis of the performance in a commercial Open-Cathode Polymer
Electrolyte Fuel Cell (PEFC) stack is conducted using simultaneous Electrochemical
Impedance Spectroscopy (EIS) measurements. The factors that limit the performance of
the PEFC stack were evaluated with EIS measurements and the impedance model
developed in the authors’ previous study. The results showed that adsorbed intermediate
species during the oxygen reduction reaction (ORR) limit the PEFC stack performance.
The activation overpotential in the stack was dominated by low electrocatalytic activity
from one of the cells. The inhomogeneity of air flow rate for this particular PEFC stack
played an important role in oxygen transport limitations and ohmic resistance. This study
has demonstrated that simultaneous EIS is a powerful tool for in-situ diagnosis of a PEFC
stack. This EIS understanding has enabled an assessment of the state of health and
performance of the fuel cell stack.
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