Development of a Durable PEMFC Start-Up Process by Applying a Dummy Load : II. Diagnostic Study
- Development of a Durable PEMFC Start-Up Process by Applying a Dummy Load : II. Diagnostic Study
- 김재홍; 조은애; 장종현; 김형준; 임태훈; 오인환; 고재준; 손익제
- PEMFC; Durability
- Issue Date
- Journal of the Electrochemical Society
- VOL 157, NO 1, B118-B124
- 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.
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