Effect of sintering temperature on microstructure, chemical stability, and electrical properties of transition metal or Yb-doped BaZr0.1Ce0.7Y0.1M0.1O3?? (M = Fe, Ni, Co, and Yb)

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dc.contributor.authorMirfakhraie, Behzad
dc.contributor.authorRamezanipour, Farshid
dc.contributor.authorPaulson, Scott
dc.contributor.authorVirss, Viola
dc.contributor.authorThangadurai, Venkataraman
dc.date.accessioned2020-02-28T22:21:58Z
dc.date.available2020-02-28T22:21:58Z
dc.date.issued2014-03-13
dc.description.abstractPerovskite-type BaZr0.1Ce0.7Y0.1M0.1O3?? (M = Fe, Ni, Co, and Yb) (BZCY-M) oxides were synthesized using the conventional solid-state reaction method at 1350–1550°C in air in order to investigate the effect of dopants on sintering, crystal structure, chemical stability under CO2 and H2S, and electrical transport properties. The formation of the single-phase perovskite-type structure with an orthorhombic space group Imam was confirmed by Rietveld refinement using powder X-ray diffraction for the Fe, Co, Ni, and Yb-doped samples. The BZCY-Co and BZCY-Ni oxides show a total electrical conductivity of 0.01 and 8 × 10?3 S cm?1 at 600°C in wet H2 with an activation energy of 0.36 and 0.41 eV, respectively. Scanning electron microscope and energy-dispersive X-ray analysis revealed Ba and Co-rich secondary phase at the grain-boundaries, which may explain the enhancement in the total conductivity of the BZCY-Co. However, ex-solution of Ni at higher sintering temperatures, especially at 1550°C, decreases the total conductivity of the BZCY-Ni material. The Co and Ni dopants act as a sintering aid and form dense pellets at a lower sintering temperature of 1250°C. The Fe, Co, and Ni-doped BZCY-M samples synthesized at 1350°C show stability in 30 ppm H2S/H2 at 800°C, and increasing the firing temperature to 1550°C, enhanced the chemical stability in CO2/N2 (1:2) at 25–900°C. The BZCY-Co and BZCY-Ni compounds with high conductivity in wet H2 could be considered as possible anodes for intermediate temperature solid oxide fuel cells.
dc.identifier.citationMirfakhraei, B., Ramezanipour, F., Paulson, S., Birss, V., & Thangadurai, V. (2014). Effect of Sintering Temperature on Microstructure, Chemical Stability, and Electrical Properties of Transition Metal or Yb-Doped BaZr0.1Ce0.7Y0.1M0.1O3−δ (M = Fe, Ni, Co, and Yb). Frontiers in Energy Research, 2. https://doi.org/10.3389/fenrg.2014.00009
dc.identifier.doi10.3389/fenrg.2014.00009
dc.identifier.issn2296-598X
dc.identifier.urihttp://hdl.handle.net/1880/111693
dc.identifier.urihttps://dx.doi.org/10.11575/PRISM/37612
dc.language.isoenen
dc.language.isoeng
dc.publisherFrontiers Media SA
dc.publisher.departmentDepartment of Chemistry
dc.publisher.facultyScienceen
dc.publisher.hasversionpublishedVersion
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.policyhttps://doaj.org/
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en
dc.rights© 2014 Mirfakhraei, Ramezanipour, Paulson, Birss and Thangadurai
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.subjecthigh temperature proton conductor
dc.subjectchemical stability
dc.subjectdoped barium cerate
dc.subjectSOFC
dc.subjectanode material
dc.titleEffect of sintering temperature on microstructure, chemical stability, and electrical properties of transition metal or Yb-doped BaZr0.1Ce0.7Y0.1M0.1O3?? (M = Fe, Ni, Co, and Yb)
dc.typejournal article
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