Structural, electrical, and electrochemical properties of cobalt-doped NiFe2O4 as a potential cathode material for solid oxide fuel cells

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yuanyuan Rao
  • Long Chen
  • Ruofei Wu
  • Ranran Peng
  • Yalin Lu

Detail(s)

Original languageEnglish
Pages (from-to)14329-14336
Journal / PublicationInternational Journal of Hydrogen Energy
Volume38
Issue number33
Publication statusPublished - 4 Nov 2013
Externally publishedYes

Abstract

In this work, Co-doped NiFe2O4 spinels (NFCO-x) are successfully fabricated and characterized as possible cathode materials for the intermediate-temperature solid oxide fuel cells (SOFC). Results of the binding energy calculations using the density functional theory suggest that the reverse spinel structure is stable when Co3+ occupies the octahedral interstitial sites. Total and ionic-only conductivities indicate that NFCO-x are a kind of mixed electronic-ionic conductors. Ionic transferring numbers are approximately 0.049 and 0.006 for NFCO-0.1 and NFCO-0.5, respectively, measured at 700 C in air. Co dopant in the NFCO-x improves the electronic conductivity at the expense of the ionic conductivity. For NFCO-0.5, electronic and ionic conductivities are approximately 0.24 and 9.6 × 10-4 S cm -1, respectively, measured also at 700 C in air. Unlike behaviour of the conductivities, the polarization resistance of symmetric cells with NFCO-x electrodes decreases when increasing the Co content (x) to a certain level, and then increases. The cell containing the NFCO-0.5 electrode exhibits the lowest polarization resistance (Rp), which is approximately 1.51 Ω cm2 at 650 C. For single cells, the maximum power density is 320 mW cm-2 measured at 650 C using a 38-μm-thick SDC electrolyte and an NFCO-0.5 cathode. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Research Area(s)

  • Cathode, Electrical conductivity, Single-phase electrode, Solid oxide fuel cell, Spinel material

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Structural, electrical, and electrochemical properties of cobalt-doped NiFe2O4 as a potential cathode material for solid oxide fuel cells. / Rao, Yuanyuan; Wang, Zhenbin; Chen, Long et al.
In: International Journal of Hydrogen Energy, Vol. 38, No. 33, 04.11.2013, p. 14329-14336.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review