Structural and electrochemical properties of the perovskite oxide Pr 0.7Sr0.3Cr0.9Ni0.1O 3 -δ

Shanwen Tao, J. T S Irvine

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15 Citations (Scopus)

Abstract

The perovskite oxide Pr0.7Sr0.3Cr 0.9Ni0.1O3 -d was synthesised by a combustion method. Pr0.7Sr0.3Cr0.9Ni 0.1O3 -d obtained at 1400 °C has been shown to have an orthorhombic structure with space group Pnma (62), a=5.4388(1)Å, b = 7.6969(1)Å, c = 5.4584(1)Å, V=228.50(1)Å3 according to X-ray diffraction. The material is redox stable and maintains its structure in a reducing atmosphere. After reducing in 5% H2 at 900 °C for 190 h, Pr0.7Sr0.3Cr0.9Ni 0.1O3-d still exhibits an orthorhombic structure. A lattice volume expansion of 0.61% was observed during the reduction, which may be attributed to reduction of Pr, Cr and Ni ions accompanying loss of lattice oxygen. TGA analysis and EDS indicate Pr0.7Sr0.3Cr 0.9Ni0.1O3 -d shows enhanced resistance to nickel reduction. The conductivities of this material in air and 5% H 2 were 27.4 and 1.37 S/ cm respectively at 900 °C. Pr 0.7Sr0.3Cr0.9Ni0.1O 3 -d exhibits semiconductor behaviour in both air and 5% H 2. The anode polarisation resistance of Pr0.7Sr 0.3Cr0.9Ni0.1O3 -d reached 0.98 Ocm2 at 900 °C in wet H2 but still not good enough as a good SOFC anode although it could be further improved by optimisation of microstructure. © 2008 Elevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)725-731
Number of pages7
JournalSolid State Ionics
Volume179
Issue number19-20
DOIs
Publication statusPublished - Aug 2008

Keywords

  • Electrical conductivity
  • Fuel cell
  • Perovskite
  • Pr 0.7 Sr 0.3 Cr 0.9 Ni 0.1 O 3 -δ
  • Structure

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