Synthesis and characterization of B-site doped La0.20Sr0.25Ca0.45TiO3 as SOFC anode materials

Azra Yaqub, Naveed Janjua, Cristian Daniel Savaniu, John Thomas Sirr Irvine

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

In this paper, B-site doping of an optimized A-site deficient composition, calcium-doped lanthanum strontium titanate, La0.2Sr0.25Ca0.45TiO3 (LSCTA−) with Ni and Fe is presented. The doped compositions were successfully synthesized by the Pechini method and then characterized by XRD, SEM, dilatometry, ac impedance, and dc conductivity. The doped analogues preserved the orthorhombic symmetry of the parent, LSCTA−. The observed dilatometric results were correlated with the particle size. Ac impedance studies revealed their semi-conducting behaviour in air. Furthermore, the doped compositions showed higher conductivity values in reducing atmosphere. Compared to bare pre reduced LSCTA− having conductivity of 38 S cm−1, the pre reduced 5% Ni doped LSCTA− (LSCTN5) and 5% Fe doped LSCTA− (LSCTF5) showed conductivity values of 47 S cm−1 and 66 S cm−1 at 880 °C, respectively. B-site doping could affect the electrical and catalytic properties of LSCTA− materials making them viable alternatives for fuel cell applications.

Original languageEnglish
Pages (from-to)760-766
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number1
Early online date10 Sept 2014
DOIs
Publication statusPublished - 5 Jan 2015

Keywords

  • B-site doping
  • Dc conductivity
  • Anode material
  • Fuel cell

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