Fe-substituted SrTiO3-δ-Ce0.9Gd 0.1O2 composite anodes for solid oxide fuel cells

Sungmee Cho, Daniel E. Fowler, Elizabeth C. Miller, J. Scott Cronin, Kenneth R. Poeppelmeier, Scott A. Barnett

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Abstract

A new composite solid oxide fuel cell anode material, SrTi 1-xFexO3-δ mixed with Gd-doped ceria, was tested in La0.9Sr0.1Ga0.8Mg 0.2O3-δ electrolyte-supported cells with La 0.4Ce0.6O2 barrier layers and La 0.6Sr0.4Fe0.8Co0.2O3 cathodes. The x = 0.7 composition had an anode polarization resistance of 0.17 Ω cm2, at 800 °C in humidified H2, much lower than the value 0.39 Ω cm2 measured for x = 0.4 and 3.14 Ω cm2 for x = 0. The reduced polarization resistance correlated with increased oxygen non-stoichiometry δ, which suggests that it may be related to increased ionic conductivity. Electrochemical impedance spectroscopy (EIS) measurements at 800 °C on the x = 0.7 anode cell showed a main response centered at ∼1 Hz that increased with decreasing hydrogen partial pressure. The maximum power density observed was for the x = 0.7 cell-337 mW cm-2 at 800 °C in air and humidified hydrogen-and was limited mainly by the thick electrolyte.

Original languageEnglish
Pages (from-to)1850-1857
Number of pages8
JournalEnergy and Environmental Science
Volume6
Issue number6
DOIs
Publication statusPublished - Jun 1 2013

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ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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