Silver Based Perovskite Nanocomposites as Combined Cathode and Current Collector Layers for Solid Oxide Fuel Cells
Properties of silver at elevated temperatures limit its use as a porous electrode or current collector in solid oxide fuel cell (SOFC) configurations. Its relatively low melting temperature (962°C) leads to accelerated densification of silver at operating temperatures of intermediate temperature SOFCs (550°C-800°C). In previous studies, powder based silver composites demonstrated stable microstructures with desirable porosity and electrical conductivity during long-term testing. Although the characterized features of the silver based composites allowed their use as efficient and stable cathode current collectors, they demonstrated limited electrochemical performance as a cathode layer. In this study, nanostructured coatings of various perovskite based cathode materials (lanthanum-strontium manganite (LSM), lanthanum-strontium ferrite (LSF), lanthanum-strontium cobalt-ferrite (LSCF)) were deposited into porous silver composites by infiltration of polymeric precursors to enhance their electrode efficiencies. As a result, novel metal-matrix perovskite nanocomposites were obtained. The properties of the Ag based nanocomposites allowed their use as a combined cathode and current collector layer with significantly improved electrochemical performance and long term stability at 800°C in air.
A. Sarikaya et al., "Silver Based Perovskite Nanocomposites as Combined Cathode and Current Collector Layers for Solid Oxide Fuel Cells," Journal of The Electrochemical Society, The Electrochemical Society (ECS), Aug 2012.
The definitive version is available at http://dx.doi.org/10.1149/2.013211jes
Materials Science and Engineering
Keywords and Phrases
Fuel Cells; Electrolyzers; Energy Conversion
Article - Journal
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