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Structure and properties of MgMxCr2-xO4 (M = Li, Mg, Ti, Fe, Cu, Ga) spinels for electrode supports in solid oxide fuel cells
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dc.contributor.author | Stefan, Elena | |
dc.contributor.author | Connor, Paul Alexander | |
dc.contributor.author | Azad, Abul Kalam | |
dc.contributor.author | Irvine, John Thomas Sirr | |
dc.date.accessioned | 2015-09-17T23:10:55Z | |
dc.date.available | 2015-09-17T23:10:55Z | |
dc.date.issued | 2014-11-14 | |
dc.identifier | 158979917 | |
dc.identifier | 48b21ebd-c8a9-4b2c-a55f-8374c604d461 | |
dc.identifier | 84907719863 | |
dc.identifier | 000343961300051 | |
dc.identifier.citation | Stefan , E , Connor , P A , Azad , A K & Irvine , J T S 2014 , ' Structure and properties of MgM x Cr 2-x O 4 (M = Li, Mg, Ti, Fe, Cu, Ga) spinels for electrode supports in solid oxide fuel cells ' , Journal of Materials Chemistry A , vol. 2 , no. 42 , pp. 18106-18114 . https://doi.org/10.1039/c4ta03633f | en |
dc.identifier.issn | 2050-7488 | |
dc.identifier.other | ORCID: /0000-0002-1492-7590/work/60427204 | |
dc.identifier.other | ORCID: /0000-0002-8394-3359/work/68280804 | |
dc.identifier.uri | https://hdl.handle.net/10023/7501 | |
dc.description | The authors thank the Office of Naval Research, USA, grant code N00014-11-1-0247, the Engineering and Physical Sciences Research Council, UK, grant platform EP/E064248/1 and the European Union's Seventh Framework Programme (FP7/2007-2013) for the Fuel Cell and Hydrogen Joint Technology initiative under grant agreement no. [FCH JU-GA 278257]10 for financial support. | en |
dc.description.abstract | Novel electrode scaffold materials based on chromium-rich spinets, such as MgMxCr2-xO4, = Li, Mg, Ti, Fe, Cu, Ga) have been investigated for solid oxide fuel cell (SOFC) applications, in terms of conductivity and chemical stability when operated in fuel environments. Cation distributions were obtained by Rietveld refinement from X-ray diffraction data (XRD), with cation site preference considered in agreement with literature, and correlated with electrical properties determined experimentally. The substitutions with cations such as Li and Cu on B site improved the conductivity of the materials in air, while introducing Fe and Ga in the structure led to a decrease in conductivity in air. However, Fe had a positive contribution under reducing conditions, generating a change in the conductivity mechanism from p-type in air, to n-type. Conductivity measurements indicated that MgFexCr2-xO4 spinets exhibit faster reduction kinetics, in comparison with other substituted cations at the B site which is desirable in fuel cell application, for a reasonably fast response of a cell or a stack to reach its full functional potential. MgFeCrO4 showed fast reduction kinetics, with increase of the conductivity in reducing conditions from 0.014 S cm-1 to 0.4 S cm-1 and equilibration time for reaching the maximum conductivity value of 10 hours, under dry 5% H2/Ar at 850 degrees °C. | |
dc.format.extent | 9 | |
dc.format.extent | 1137777 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Materials Chemistry A | en |
dc.subject | Anode materials | en |
dc.subject | SOFC anode | en |
dc.subject | Surface modification | en |
dc.subject | YSZ | en |
dc.subject | Performance | en |
dc.subject | Composite | en |
dc.subject | Transport | en |
dc.subject | Radii | en |
dc.subject | Ceria | en |
dc.subject | CR | en |
dc.subject | QD Chemistry | en |
dc.subject.lcc | QD | en |
dc.title | Structure and properties of MgMxCr2-xO4 (M = Li, Mg, Ti, Fe, Cu, Ga) spinels for electrode supports in solid oxide fuel cells | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | European Commission | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. St Andrews Sustainability Institute | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1039/c4ta03633f | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2015-09-18 | |
dc.identifier.grantnumber | EP/E064248/1 | en |
dc.identifier.grantnumber | en | |
dc.identifier.grantnumber | EP/K015540/1 | en |
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