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Development of a Durable PEMFC Start-Up Process by Applying a Dummy Load: II. Diagnostic Study
- Source :
- Journal of the Electrochemical Society; January 2010, Vol. 157 Issue: 1
- Publication Year :
- 2010
-
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 CO2analysis, 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.
Details
- Language :
- English
- ISSN :
- 00134651 and 19457111
- Volume :
- 157
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Journal of the Electrochemical Society
- Publication Type :
- Periodical
- Accession number :
- ejs61765318
- Full Text :
- https://doi.org/10.1149/1.3246003