Abstract
Abstract Composite cathodes Ag-La0.6Sr0.4Co0.2Fe0.8O3-δ were obtained by two different procedures. In the first procedure porous La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) matrix was prepared by sintering the LSCF paste, the matrix was then saturated with AgNO3 solution and sintered again. Introduced silver crystalized in the form of 10 nm crystallites in the whole LSCF matrix. In the second procedure the paste of silver powder was deposited on the surface of electrolyte and dried. The layer of silver paste was then covered by a layer of the LSCF paste and sintered at 850°C. The following cells were tested: H2|Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm0.2O1.9 LSCF|O2, H2|Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm0.2O1.9|LSCF-Ag|O2 and H2|Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm-O1.9|Ag|LSCF|O2. Introduction of silver interlayer between cathode and electrolyte increased output power by 18-28% whereas introduction of metallic silver into porous LSCF caused increase in power by 14-18%.
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