Effects of Pt loading in the anode on the durability of a membrane-electrode assembly for polymer electrolyte membrane fuel cells during startup/shutdown cycling

Title
Effects of Pt loading in the anode on the durability of a membrane-electrode assembly for polymer electrolyte membrane fuel cells during startup/shutdown cycling
Authors
엄광섭김경희조은애장종현김형준유성종김수길홍보기
Keywords
PEMFC; Polymer electrolyte membrane fuel cell; Membraneeelectrode assembly; Durability; Reverse current condition; Startup and shutdown cycling; Anode platinum loading
Issue Date
2012-12
Publisher
International journal of hydrogen energy
Citation
VOL 37, NO 23, 18455-18462
Abstract
A polymer electrolyte membrane fuel cell (PEMFC) stack of a fuel cell vehicle (FCV) is inevitably exposed to reverse current conditions, which are formed by the oxygen reduction reaction (ORR) induced at the anode with a hydrogen/air boundary during startup/ shutdown processes. With an increase in the reverse current, the degradation rate of the cathode that experiences a highly corrosive condition (locally high potential) increases. In this work, the anode Pt loading is decreased from 0.4 to 0.1 mg cm-2 to decrease the reverse current. The decrease in the anode Pt loading is found to decrease the hydrogen oxidation rates (HOR) during normal operation, but this loading decrease barely affected the cell performance. However, a decrease in the anode Pt loading can significantly decrease the reverse current, leading to a diminished cathode degradation rate during startup/shutdown cycling. It is revealed by slow decreases in the cell performance (i-V curves) and electrochemical active surface area (EAS), and a slow increase in the charge-transfer resistance (Rct), which can be attributed to corrosion of the carbon support and dissolution/ migration/agglomeration of the platinum catalyst.
URI
http://pubs.kist.re.kr/handle/201004/43231
ISSN
03603199
Appears in Collections:
KIST Publication > Article
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