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.
ASJC Scopus subject areas
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering