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Issue 6, 2013
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Fe-substituted SrTiO3−δ–Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells

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Abstract

A new composite solid oxide fuel cell anode material, SrTi1−xFexO3−δ mixed with Gd-doped ceria, was tested in La0.9Sr0.1Ga0.8Mg0.2O3−δ electrolyte-supported cells with La0.4Ce0.6O2 barrier layers and La0.6Sr0.4Fe0.8Co0.2O3 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.

Graphical abstract: Fe-substituted SrTiO3−δ–Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells

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Publication details

The article was received on 15 Oct 2012, accepted on 11 Apr 2013 and first published on 26 Apr 2013


Article type: Paper
DOI: 10.1039/C3EE23791E
Citation: Energy Environ. Sci., 2013,6, 1850-1857
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    Fe-substituted SrTiO3−δ–Ce0.9Gd0.1O2 composite anodes for solid oxide fuel cells

    S. Cho, D. E. Fowler, E. C. Miller, J. S. Cronin, K. R. Poeppelmeier and S. A. Barnett, Energy Environ. Sci., 2013, 6, 1850
    DOI: 10.1039/C3EE23791E

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