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Paper
J. Mater. Chem., 2007, 17, 3175 - 3181, DOI: 10.1039/b704320a
Layered perovskites as promising cathodes for intermediate temperature solid oxide fuel cells
Albert Tarancón, Stephen J. Skinner, Richard J. Chater, F. Hernández-Ramírez and John A. Kilner
The suitability of GdBaCo2O5+
as a cathode material for intermediate temperature solid oxide fuel cells has been evaluated. The 18O/16O isotope exchange depth profile (IEDP) method has been used to obtain the oxygen surface exchange and oxygen tracer diffusion coefficients yielding optimum values for applicability in fuel cells (k* = 2.8 × 10–7 cm s–1 and D* = 4.8 × 10–10 cm2 s–1 at 575 °C) especially in terms of low activation energies (EAk = 0.81(4) and EAD = 0.60(4) eV). The same material has been characterized electrically as a part of a symmetrical electrochemical system (GdBaCo2O5+/Ce0.9Gd0.1O2–x/GdBaCo2O5+), by means of impedance spectroscopy measurements, corroborating an excellent performance in the classical intermediate temperature range for solid oxide fuel cells (500–700 °C). An area specific resistance (electrode–electrolyte interface) of 0.25 
cm2 at 625 °C was achieved for a cell processing temperature of 975 °C. Finally, layered perovskites are presented as a promising new family of materials for cathode use in solid oxide fuel cells at low temperatures.
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