40 KB862 KB39 KB199219991999Bernik, SlavkoHolc, JanezHrovat, Markoštevilka:3/4letnik:338 stranistr. 193-200ISSN:1318-0010COBISSID:156074URN:URN:NBN:SI:doc-EWBC705LslInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijedelovanjegorivne celiceinterakcijematerialiSOFCKeramični materiali za visokotemperaturne gorivne celice s trdnim elektrolitom - SOFC| Ceramic materials for high temperature solid oxide fuel cells (SOFC)|A fuel cell is a device for direct conversion of chemical energy into electrical energy. Short review of fuel cells technology and characteristics is given. High temperataure solid oxide fuel cells (SOFC) work at temperatures of upon to 1000°C while the next generation will have lower operating temperatures around or under 800°C. Due to high working temperatures mostly ceramic materials, which must be stable and compatible, are used for SOFC construction. The solide electrolyte in SOFC cells is usually yttria stabilized cubic zirconia (YSZ) with a high ionic and low electronic conductivity. Alternative solid electrolytes for lower temperature SOFC are dopt ?$CeO_2$? and ?$LaGaO_3$?. Condictive perovskites based on doped ?$LaMnO_3$? and ?$LaCO_3$? are used for cathodes (air electrodes). Perovskites react with YSZ at elevated temperatures forming and undesirable high resistivity phases on the interface. Phase relations between perovskites and materials for solid electrolyte were investigated. The influence of partial exchange of "A" and "B" cations on characteristic and reactivity of cathode materials were studiesGorivna celica je element, ki pretvarja kemijsko energijo goriva naravnost v električno. V prispevku podajamo kratek pregled karakteristik gorivnih celic. Visokotemperaturne gorivne celice s trdnim elektrolitom (SOFC) delujejo danes pri temperaturah okrog 1000°C, težnja pa je znižanje temperature delovanja na okrog 800°C. Zaradi visokih temperatur delovanja SOFC uporabljajo za komponente v glavnem kemične materiale. Osnovne zahteve zanje so stabilnost in kompatibilnost pri visokih temperaturah. Za trdni elektrolit se večinoma uporablja z ?$Y_2O_3$? stabilizirana kubična oblika ?$ZrO_2$?, ki ima visoko ionsko prevodnost in nizko elektronsko. Alternativna materiala za SOFC z nižjo temperaturo delovanja sta predvsem dopirana ?$CeO_2$? in ?$LaGaO_3$?. Za katodo se uporabljajo perovskiti na osnovi dopiranega ?$LaMnO_3$?, ?$LaFeO_3$?ali ?$LaCoO_3$?. Perovskiti reagirajo pri povišanih temperaturah z ?$ZrO_2$? in lahko tvorijo na stiku nezaželene visokouporovne faze. Preiskovali smo fazne relacije med prevodnimi perovskiti in materiali za trdne elektrolite. Študirali smo vpliv zamenjave dela kationov na mestih "A" in "B" v perovskitni strukturi na karakteristike in reaktivnost katodnih materialovTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije