A kind of nanostructured Ce_0.9Sm_0.1O_1.95 is prepared by a hydrothermal method. It exhibits large Brunauer-Emmett-Teller area (>120 m² g^–1), open mesoporous structure and nanocrystalline sheets. This material shows high activity for oxygen reduction. An area specific resistance below 0.6 Ω cm² at 600 °C is achieved when it is mixed with Ag paste as a composite cathode in a symmetric cell. This is attributed to its large triple phase boundary area and good ionic conducting property. The influences of microstructure, doping, loading effects of silver nanoparticles and the temperature dependence on oxygen reduction kinetics are investigated by the impedance spectroscopy. Although some further optimisations are still required, this special Ce_0.9Sm_0.1O_1.95 material reported here exhibits promising features of applications in the composite electrodes for intermediate temperature solid oxide fuel cells (IT-SOFCs).

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Volume9, Issue5

October, 2009

Pages 650-656

Studies on Composite Cathode with Nanostructured Ce_0.9Sm_0.1O_1.95 for Intermediate Temperature Solid Oxide Fuel Cells

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Studies on Composite Cathode with Nanostructured Ce0.9Sm0.1O1.95 for Intermediate Temperature Solid Oxide Fuel Cells

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Studies on Composite Cathode with Nanostructured Ce_0.9Sm_0.1O_1.95 for Intermediate Temperature Solid Oxide Fuel Cells