[Zurück]

J. Januschewsky, M. Ahrens, A.K. Opitz, F. Kubel, J. Fleig:
"Optimized La_0.6Sr_0.4CoO_3-δ Thin-Film Electrodes with Extremely Fast Oxygen-Reduction Kinetics";
Advanced Functional Materials, 19 (2009), S. 3151 - 3156.

La0.6Sr0.4CoO3-δ (LSC) thin-film electrodes are prepared on yttria-stabilized zirconia (YSZ) substrates by pulsed laser deposition at different deposition temperatures. The decrease of the film crystallinity, occurring when the deposition temperature is lowered, is accompanied by a strong increase of the electrochemical oxygen exchange rate of LSC. For more or less X-ray diffraction (XRD)-amorphous electrodes deposited between ca. 340 and 510 °C polarization resistances as low as 0.1 Ω cm2 can be obtained at 600 °C. Such films also exhibit the best stability of the polarization resistance while electrodes deposited at higher temperatures show a strong and fast degradation of the electrochemical kinetics (thermal deactivation). Possible reasons for this behavior and consequences with respect to the preparation of high-performance solid oxide fuel cell (SOFC) cathodes are discussed.

http://dx.doi.org/10.1002/adfm.200900362