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

Research output: Contribution to journalArticle

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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 2013

Fingerprint

fuel cell
Solid oxide fuel cells (SOFC)
electrolyte
Anodes
polarization
oxide
hydrogen
Electrolytes
Hydrogen
Composite materials
partial pressure
Polarization
conductivity
spectroscopy
Cerium compounds
Ionic conductivity
Electrochemical impedance spectroscopy
Partial pressure
oxygen
air

ASJC Scopus subject areas

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

Cite this

Fe-substituted SrTiO3-δ-Ce0.9Gd 0.1O2 composite anodes for solid oxide fuel cells. / Cho, Sungmee; Fowler, Daniel E.; Miller, Elizabeth C.; Cronin, J. Scott; Poeppelmeier, Kenneth R; Barnett, Scott A.

In: Energy and Environmental Science, Vol. 6, No. 6, 06.2013, p. 1850-1857.

Research output: Contribution to journalArticle

Cho, Sungmee ; Fowler, Daniel E. ; Miller, Elizabeth C. ; Cronin, J. Scott ; Poeppelmeier, Kenneth R ; Barnett, Scott A. / Fe-substituted SrTiO3-δ-Ce0.9Gd 0.1O2 composite anodes for solid oxide fuel cells. In: Energy and Environmental Science. 2013 ; Vol. 6, No. 6. pp. 1850-1857.
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