Characteristics and performance of membrane electrode assemblies with operating conditions in polymer electrolyte membrane fuel cell

Title
Characteristics and performance of membrane electrode assemblies with operating conditions in polymer electrolyte membrane fuel cell
Authors
조용훈유성종박인수전태열조윤환임주완권오중윤원섭성영은
Keywords
Polymer electrolyte membrane fuel cell (PEMFC); Constant voltage; Load cycling; Membrane-electrode assembly (MEA)
Issue Date
2010-12
Publisher
Electrochimica acta
Citation
VOL 56, NO 2, 717-721
Abstract
The degradation behavior of a membrane-electrode assembly (MEA) was investigated in accelerated degradation tests under constant voltage (0.8 V and 0.7 V) and load cycling (from open circuit voltage to 0.35 V) conditions. Changes in the structural and electrochemical characteristics of MEA after the durability tests give information as to the degradation mechanism of MEAs. The results of cyclic voltammogram and postmortem analysis by X-ray diffraction and high resolution-transmission electron microscopy indicate that the cathode catalyst layers of the MEAs showed no extreme degradation under constant voltage mode, whereas MEAs under repetition of load cycling mode showed very severe degradation after 280 h. However, the single cell performance of the MEA under repetition of load cycling mode was higher than under constant voltage mode. In addition, although the Pt band in the membrane of the MEA under repetition of load cycling mode was observed by field emission scanning electron microscopy, it did not affect the ohmic resistance.
URI
http://pubs.kist.re.kr/handle/201004/38302
ISSN
0013-4686
Appears in Collections:
KIST Publication > Article
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