Development of a Durable PEMFC Start-Up Process by Applying a Dummy Load : II. Diagnostic Study

Title
Development of a Durable PEMFC Start-Up Process by Applying a Dummy Load : II. Diagnostic Study
Authors
김재홍조은애장종현김형준임태훈오인환고재준손익제
Keywords
PEMFC; Durability
Issue Date
2010-01
Publisher
Journal of the Electrochemical Society
Citation
VOL 157, NO 1, B118-B124
Abstract
To investigate the effect of an application of a dummy load during the start-up procedure on the degradations of a membrane electrode assembly MEA exposed to the 1200 repetitive start-up–shutdown cycling, this paper uses a variety of physicochemical methods such as online CO2 analysis, field-emission-scanning electron microscopy, energy dispersive X-ray, electron probe microanalysis, X-ray diffraction, field-emission transmission electron microscopy, selected-area electron diffraction, X-ray photoelectron spectroscopy, Fourier transformation infrared, and inductively coupled plasma. After the 1200 start-up–shutdown cycles, a pronounced particle size growth/agglomeration/oxidation/dissolution of the Pt catalysts and corrosion of the carbon support were observed at the cathode catalyst layer when starting up a proton exchange membrane fuel cell PEMFC without a dummy load, which significantly contributed to the losses of active Pt surface area and Pt mass for electrochemical reactions, and thus the degradation of cell performance. However, applying a dummy load during the start-up procedure remarkably mitigated such severe degradations and should be used to improve the durability of MEAs during start-up–shutdown cycling of PEMFCs. Degradations at the anode and membrane were not as severe as those observed at the cathode.
URI
http://pubs.kist.re.kr/handle/201004/35759
ISSN
0013-4651
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KIST Publication > Article
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