A Study of Thermal Stability and Methane Tolerance of Cu-Based SOFC Anodes with Electrodeposited Co

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dc.contributor.authorVohs, John M
dc.contributor.authorGross, Michael D
dc.contributor.authorGorte, Raymond J
dc.date2023-05-17T00:34:01.000
dc.date.accessioned2023-05-22T12:41:06Z
dc.date.available2023-05-22T12:41:06Z
dc.date.issued2007-01-01
dc.date.submitted2007-03-01T07:57:39-08:00
dc.description.abstractCu-based, solid oxide fuel cell (SOFC) electrodes were modified by electrodeposition of Co. The addition of only 5-vol% Co by electrodeposition significantly improved the thermal stability compared to either Cu-ceria-YSZ, Cu-Co-ceria-YSZ, or Co-ceria-YSZ electrodes prepared only by impregnation with much higher metal loadings, demonstrating that electrodeposited metal layers form metal films with better connectivity. In the absence of Co, SEM showed structural changes in the impregnated Cu after heating to 1173 K in humidified H2 and these changes caused large increases in the ohmic resistance of fuel cells, as measured by impedance spectroscopy. In contrast, the ohmic resistance of a cell with 13-vol% Cu, 9-vol% ceria, and 5-vol% Co increased only slightly after 48 h at 1173 K in humidified H2. While a Co-ceria-YSZ composite was found to form large amounts of carbon upon exposure to dry CH4 at 1073 K for 3 h, the Co-Cu-ceria-YSZ composites did not form measurable amounts of carbon for the same conditions. XPS results for a Cu foil with a 250-nm Co film demonstrated that Cu migrates to the surface of the Co upon heating above 873 K, forming a stable Cu layer that appears to be approximately one monolayer thick. The implication of these results for the development of practical SOFC electrodes for the direct utilization of hydrocarbons is discussed.
dc.description.commentsPostprint version. Published in Electrochimica Acta, Volume 52, Issue 5, January 2007, pages 1951-1957. Publisher URL: http://dx.doi.org/10.1016/j.electacta.2006.08.005
dc.identifier.urihttps://repository.upenn.edu/handle/20.500.14332/5903
dc.legacy.articleid1092
dc.legacy.fulltexturlhttps://repository.upenn.edu/cgi/viewcontent.cgi?article=1092&context=cbe_papers&unstamped=1
dc.source.issue85
dc.source.journalDepartmental Papers (CBE)
dc.source.peerreviewedtrue
dc.source.statuspublished
dc.subject.othersolid oxide fuel cells; electrodeposits; thermal stability; methane tolerance; cobalt
dc.titleA Study of Thermal Stability and Methane Tolerance of Cu-Based SOFC Anodes with Electrodeposited Co
dc.typeArticle
digcom.identifiercbe_papers/85
digcom.identifier.contextkey261344
digcom.identifier.submissionpathcbe_papers/85
digcom.typearticle
dspace.entity.typePublication
relation.isAuthorOfPublication147f21f3-b05a-4b4a-9ea6-fa1f4ecb9f78
relation.isAuthorOfPublicationc6766e0b-b0f0-4f6c-a5d7-df1823a94b97
relation.isAuthorOfPublication.latestForDiscovery147f21f3-b05a-4b4a-9ea6-fa1f4ecb9f78
upenn.schoolDepartmentCenterDepartmental Papers (CBE)
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