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1305 |
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Monday, June 02, 2008, Auditorium 2 4:00 PM Solid Oxide Fuel Cell 2 Coatings for SOFC components for mobile and stationary applications, thermal and electrical insulation by thermal sprayed ceramic coatings |
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Plasma sprayed sprayed oxygen electrode for solid oxide fuel cells and high temperature water electrolyzers |
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Asif Ansar / German Aerospace Center, Germany Günter Schiller/ German Aerospace Center, Germany Olav Patz/ German Aerospace Center, Germany Jean-Baptise Gregoire/ German Aerospace Center, Germany Zeynep Ilhan*/ German Aerospace Center, Germany |
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Perovskite-type LSM and LSCF deposits were developed for oxygen electrode for solid oxide fuel cell and high temperature electrolyzer by atmospheric plasma spraying (APS) using different feedstock powders. The deposits were tailored to exhibit high oxygen catalytic activity, oxygen surface exchange and diffusion rates, gas permeability and electronic-ionic conductivity. Deposits did not exhibit undesired secondary phases that may form in plasma. Promoting partial melting of the surface of the particles ensured interlayer cohesion and very porous deposit. In SOFC mode cells with LSCF cathodes operating at 800 °C had more than 400 mW/cm² power density at 0.7 V, which was 33 % better than that of cells with LSM cathode. When operating in electrolyzer mode at 800 °C the cells with LSCF oxygen electrode also proved significantly enhanced electrochemical performance compared to cells with LSM oxygen electrode. At a current density of 1 A/cm2 the voltage for water splitting was reduced to around 1.4 V. |