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Research at St Andrews

Robust doped BaCeO3-δ electrolyte for IT-SOFCs

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Author(s)

Mohammed N Khan, Abul Kalam Azad, Cristian Daniel Savaniu, Peter Hing, John Thomas Sirr Irvine

School/Research organisations

Abstract

Single phase polycrystalline BaZr0.3Ce0.5Y0.1Yb0.1O3 - δ electrolyte material was prepared by solid state reaction route. Rietveld analysis of the XRD data confirms the tetragonal sym¬metry in the I4/mcm space group with unit cell parameters of a = b = 6.0567(3) Å and c = 8.5831(5) Å. The addition ofZnO as a sintering additive was found to reduce the sintering temperature and enhance both overall sinterability and grain growth. Sintering temperature was reduced by 200–300 °C, and a very high relative density of about 98% was achieved at 1400 °C. Impedance spectroscopy in humidified 5% H2/Ar atmosphere shows that the protonic conductivity at 600 °C was 8.60 × 10−3 S cm−1. Thermal analysis performed in pure CO2 atmosphere shows very good chemical stability up to 1200 °C. Good biaxial flexure strength of 100–200 MPa was reported which makes this material a promising electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs).
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Details

Original languageEnglish
Pages (from-to)2387-2396
Number of pages10
JournalIonics
Volume23
Issue number9
Early online date10 Apr 2017
DOIs
Publication statusPublished - Sep 2017

    Research areas

  • Perovskites, Proton conductor, SOFC, Electrochemical characterization , Crystal structure

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