Journal
JOURNAL OF POWER SOURCES
Volume 172, Issue 1, Pages 155-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.07.062
Keywords
proton exchange membrane fuel cell; degradation mechanism; current distribution; segmented cell
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To measure local phenomena in a PEMFC during a transitional state induced by changing of the feeding gas, a segmented cell was fabricated and the local current and local potential distribution were measured under open-circuit conditions. The anode or cathode was divided into 97 segments of 1.5 mm each. A change in the anode gas from nitrogen or oxygen to hydrogen induced momentary internal currents among the segments. The potential distribution in the electrolyte was observed simultaneously using three quasi-reference electrodes located locally. The results supported the reverse-current decay mechanism, which is known to be a mechanism of cathode degradation. Furthermore, internal currents were observed when the cathode gas was changed from nitrogen to oxygen. While the cathode was not subjected to a harmful potential, a large potential distribution was induced in the anode. (C) 2007 Elsevier B.V. All rights reserved.
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