Ca2+ and Sr2+ co-doped ceria/carbonates nanocomposites for low temperature solid oxide fuel cells: Composite effect

摘要: Abstract A series of co-doped ceria based nanocomposites consisting Ce 0.93 Ca 0.05 Sr 0.02 O 1.93 (CC5S2) and binary carbonates mixture Li 2 CO 3 –Na (LNCO) have been prepared as functional solid electrolytes for low temperature oxide fuel cells (LT-SOFCs). All the samples characterized with respect to their thermal behavior, phase, microstructure electrical conductivity. Single phase formation has confirmed by X-ray diffraction. In composites, are present in amorphous state. Micrographs show percolative network both phases. Impedance analysis used study conduction mechanism composites. sudden increase conductivity observed all This is attributed a superionic transition at interfaces. Conductivity increases increasing carbonate content. Composition, CC5S2/35LNCO highest conductivity, 0.27 S cm −1 500 °C an activation energy 0.30 eV. small value indicates interfacial ions