Show simple item record

Files in this item


Item metadata

dc.contributor.authorNi, Chengsheng
dc.contributor.authorIrvine, John T.S.
dc.identifier.citationNi , C & Irvine , J T S 2015 , ' Calcium manganite as oxygen electrode materials for reversible solid oxide fuel cell ' Faraday Discussions .
dc.identifier.otherPURE: 190861138
dc.identifier.otherPURE UUID: 9637ad68-2132-44ff-8d41-bd732cb7dd06
dc.identifier.otherBibtex: urn:534bddd65f3f7339a9209fed183445a5
dc.identifier.otherScopus: 84946559903
dc.descriptionThe authors thank EPSRC for funding under the contract of H2FC hub EPSRC: EP/J016454/1 and Platform EPSRC: EP/K006800/1 and JTSI thanks Wolfson Merit of Royal Society: WRMA 2012/R2en
dc.description.abstractFor an efficient high-temperature reversible solid oxide fuel cell (RSOFC), the oxygen electrode should be highly active for the conversion between oxygen anions and oxygen gas. CaMnO3-δ(CM) is a perovskite that can be readily reduced with the formation of Mn3+ giving rise to oxygen defective phases. CM is examined here as the oxygen electrode for a RSOFC. CaMn0.9Nb0.1O3-δ (CMN) with Nb doping shows superior electric conductivity (125 S cm-1 at 700 ºC) to CM (1-5 S cm-1 at 700 ºC) in air and is also examined for comparison. X-ray diffraction (XRD) data show that CM and CMN are compatible with the widely used yttria-stabilized zirconia (YSZ) electrolyte up to 950 oC. Both materials show a thermal expansion coefficient (TEC) close to 10.8-10.9 ppm K-1 in the temperature range between 100-750 ºC, compatible with that of YSZ. Polarization curves and electrochemical impedance spectra for both fuel cell and steam electrolysis modes were investigated at 700 ºC, showing that CM presented a polarization resistance of 0.059 Ωcm2 under a cathodic bias of -0.4 V while CMN gave a polarization resistance of 0.081 Ω cm2 under an anodic bias of 0.4 V. The phase stability up to 900 ºC of these materials was investigated with thermogravimetric analysis (TGA) and variable temperature XRD.
dc.relation.ispartofFaraday Discussionsen
dc.rightsCopyright 2015 the Authors. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (
dc.subjectQD Chemistryen
dc.titleCalcium manganite as oxygen electrode materials for reversible solid oxide fuel cellen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record