Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Cobalt-free SrNbxFe1−xO3−δ (x = 0.05, 0.1 and 0.2) perovskite cathodes for intermediate temperature solid oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Jiang, S.
    Sunarso, J.
    Zhou, W.
    Shen, J.
    Ran, R.
    Shao, Zongping
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Jiang, S. and Sunarso, J. and Zhou, W. and Shen, J. and Ran, R. and Shao, Z. 2015. Cobalt-free SrNbxFe1−xO3−δ (x = 0.05, 0.1 and 0.2) perovskite cathodes for intermediate temperature solid oxide fuel cells. Journal of Power Sources. 298: pp. 209-216.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2015.08.063
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/3229
    Collection
    • Curtin Research Publications
    Abstract

    The development of high performance perovskite cathode for solid oxide fuel cells (SOFCs) relies upon the knowledge and understanding of the interplay between the metal oxide components, structure, redox properties and conductivity. In this work, we partially substituted Fe on SrFeO3−δ with Nb. In particular, 3 Nb-doped compositions were prepared, e.g. SrNb0.05Fe0.95O3−δ (SNF0.05), SrNb0.1Fe0.9O3−δ (SNF0.1) and SrNb0.2Fe0.8O3−δ (SNF0.2). Mössbauer spectroscopy revealed decreasing ratio of Fe4+ to Fe3+ at the higher Nb doping content which translates to the gradual decrease of the average Fe oxidation state from 3.403 (for SNF0.05) to 3.375 (for SNF0.1) and to 3.291 (for SNF0.2). Likewise, the oxygen desorption process and the thermal expansion coefficients decreased with increasing Nb content, therefore providing evidence on their correlation with the thermal reduction of Fe4+. The temperature-dependent oxygen nonstoichiometry displayed two different regimes separated by a transition temperature of 625 °C, below which SNF0.2 showed the highest nonstoichiometry and above which SNF0.05 provided the highest nonstoichiometry. The analogous shifting in trends was reproduced for oxygen reduction reaction (ORR) performance which signifies oxygen nonstoichiometry as the main variable affecting ORR performance.

    Related items

    Showing items related by title, author, creator and subject.

    • Insight into an unusual lanthanum effect on the oxygen reduction reaction activity of Ruddlesden-Popper-type cation-nonstoichiometric La2−xNiO4+δ (x = 0–0.1) oxides
      Chen, Y.; Qian, B.; Yang, G.; Chen, D.; Shao, Zongping (2015)
      The creation of a cation deficiency in the Ln-site of some Ruddlesden-Popper-type Ln2NiO4+δ oxides (Ln = Pr, Nd) can promote the oxygen reduction activity of these materials at elevated temperatures; however, La-nonstoichiometric ...
    • High-performance SrNb0.1Co0.9-xFexO 3-d perovskite cathodes for low-temperature solid oxide fuel cells
      Zhu, Y.; Sunarso, J.; Zhou, W.; Jiang, S.; Shao, Zongping (2014)
      Chemical to electrical energy conversion using a solid oxide fuel cell (SOFC) becomes more practical as the operating temperature is lowered to 600 °C and below. Given the thermally activated nature of the oxygen reduction ...
    • Evaluation and optimization of Bi1-xSrxFeO 3-d perovskites as cathodes of solid oxide fuel cells
      Niu, Y.; Sunarso, J.; Zhou, W.; Liang, F.; Ge, L.; Zhu, Z.; Shao, Zongping (2011)
      Lattice expansion behaviour, oxygen nonstoichiometry, mean iron oxidation state, electrical conductivity and interfacial polarization resistance of Bi1-xSrxFeO3-d were reported as a function of Sr-doping content for x = ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.