Comparing shut-down strategies for proton exchange membrane fuel cells
2014 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 254, 232-240 p.Article in journal (Refereed) Published
Application of system strategies for mitigating carbon corrosion of the catalyst support in proton exchange fuel cells (PEMFCs) is a requirement for PEMFC systems, especially in the case of systems for transport application undergoing thousands of start-ups and shut-downs (SU/SD) during its lifetime. This study compares several of the most common shut-down strategies for 1100 cycles SU/SD cycles at 70 C and 80% RH using commercially available fuel cell components. Each cycle simulates a prolonged shut-down, i.e. finishing each cycle with air filled anode and cathode. Furthermore, all start-ups are unprotected, i.e. introducing the H2 rich gas into an air filled anode. Finally, each cycle also includes normal fuel cell operation at 0.5 A cm-2 using synthetic reformate/air. H2 purge of the cathode and O2 consumption using a load were found to be the most effective strategies. The degradation rate using the H2 purge strategy was 23 μV cycle-1 at 0.86 A cm-2 using H 2 and air at the anode and cathode, respectively. This degradation rate may be regarded as a generally low value, especially considering that this value also includes the degradation rate caused by unprotected start-ups.
Place, publisher, year, edition, pages
2014. Vol. 254, 232-240 p.
Carbon corrosion, Catalyst support, Proton exchange membrane fuel cell, Start-up and shut-down, System strategies
IdentifiersURN: urn:nbn:se:kth:diva-133453DOI: 10.1016/j.jpowsour.2013.12.058ISI: 000332496300030ScopusID: 2-s2.0-84892760898OAI: oai:DiVA.org:kth-133453DiVA: diva2:661442
QC 20140305. Updated from manuscript to article in journal.2013-11-042013-11-042014-04-23Bibliographically approved