Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 22, Pages 9373-9381Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.05.057
Keywords
PEM; Fuel cell; Hydrophobicity; Water removal; Purging
Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2010-0018457]
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Water removal from an idle fuel cell is an important issue for start-up/shutdown down under cold temperature conditions. In our study, we performed an in-situ neutron imaging for a PEM fuel cell with bipolar plates, treated with a super-hydrophobic and super-hydrophilic coating on the flow channels. The coatings were applied to the channels but not on the landings in contact with the GDL. The cells were run at a constant voltage prior to shutdown, then sets of neutron images were taken with purge velocities varied from 1 m s(-1) to 4 m s(-1), in intervals of 1 m s(-1). It was found that changing the wettability of the flow channels can improve the dynamics of water removal during purging. The super-hydrophilic and super-hydrophobic coating had better performance in removing water on the landings and in the channels, respectively. Based on our test cells, we used the amount of water remaining as a metric and found no significant improvement by purging the cell at velocities greater than 3 m s(-1). (C) 2011 Elsevier B.V. All rights reserved.
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