Abstract
The effect of fuel utilization on the poisoning dynamics
by carbon monoxide (CO) is studied for future automotive
conditions of Polymer Electrolyte Membrane Fuel Cells
(PEMFC). Three fuel utilizations are used, 70%, 40% and
25%. CO is fed in a constant concentration mode of 1 ppm
and in a constant molar flow rate mode (CO concentrations
between 0.18 and 0.57 ppm). The concentrations are
estimated on a dry gas basis. The CO concentration of the
anode exhaust gas is analyzed using gas chromatography.
CO is detected in the anode exhaust gas almost
immediately after it is added to the inlet gas. Moreover,
the CO concentration of the anode exhaust gas increases
with the fuel utilization for both CO feed modes. It is
demonstrated that the lower the fuel utilization, the
higher the molar flow rate of CO at the anode outlet at
early stages of the CO poisoning. These results suggest
that the effect of CO in PEMFC systems with anode gas
recirculation is determined by the dynamics of its
accumulation in the recirculation loop. Consequently,
accurate quantification of impurities limits in current
fuel specification (ISO 14687-2:2012) should be
determined using anode gas recirculation
Original language | English |
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Pages (from-to) | 122-128 |
Journal | Journal of Power Sources |
Volume | 258 |
DOIs | |
Publication status | Published - 2014 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Carbon monoxide
- fuel utilization
- gas chromatography
- hydrogen fuel specification
- impurity enrichment
- PEMFC