NdBaMn2O5+δ layered perovskite as an active cathode material for solid oxide fuel cells

Abdalla M. Abdalla, Shahzad Hossain, Jun Zhou, Pg M. I. Petra, Stene Erikson, Cristian D. Savaniu, John T. S. Irvine, Abul K. Azad

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

A layered perovskite, NdBaMn2O5+δ (NBMO), was synthesized by solid state reaction method in air. Rietveld analysis of X-Ray Diffraction (XRD) data showed the material crystallizing in orthorhombic symmetry (Pmmm space group). Scanning electron microscopy (SEM) was used to check the morphology and, the analysis of the micrographs exhibited a porous structure with in-situ growth of nanoparticles. Electrochemical Impedance Spectroscopy (EIS) measurements from 600 °C to 800 °Cshows the highest conductivity value of 1.17 × 10−1 S/cm obtained at 800 °C with low activation energy (Ea) of 0.3 eV in air. In 5% H2/Ar gas mixture, the conductivity and activation energy values were 1.97 × 10−2 S/cm and 0.4 eV, respectively at 800 °C. The DC conductivity measurements also showed that this material is highly conductive in air with a conductivity value of 0.75 S/cm at 850 °C. Dual chamber fuel cell measurements on Ni-YSZ/YSZ/NBMO cell using 5% H2/Ar as fuel (from 700 °C to 800 °C) showed a maximum power density of 0.202 W/cm2 at 800 °C. The relatively high conductivity of the material in air and low activation energy makes it a potential candidate as cathode for solid oxide fuel cells.
Original languageEnglish
Pages (from-to)15932-15938
JournalCeramics International
Volume43
Issue number17
Early online date30 Aug 2017
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Layered perovskite
  • SOFC
  • Cathode materials
  • Exsolution
  • Impedance measurements

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