LSM-YSZ Cathodes for Medium-Temperature Solid Oxide Fuel Cells
- 1 January 1997
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 1997-40 (1) , 368-378
- https://doi.org/10.1149/199740.0368pv
Abstract
The effect of cathode composition, processing, and structure on the performance of medium-temperature (600–800°C) solid oxide fuel cells (SOFCs) is described. The SOFC cathodes were two-phase mixtures of (La1−xSrx)1−yMnO3 (LSM) and Yttria-stabilized Zirconia (YSZ). The electrolytes were < 10μm thick YSZ, and the anodes were Ni-YSZ with Y-doped CeO2 interfacial layers. The cathode overpotential was the primary factor limiting cell power densities. Increasing the YSZ volume fraction in LSM-YSZ cathodes from 0 to 60% reduced the low-current area-specific resistance of the cells (in air and humidified hydrogen) from ~3 .3 to 0.7 Ω cm2 at 750°C. The use of LSM with y=0.1 suppressed the formation of zirconate phases during cathode sintering. Optimal cathode porosity was ≈ 40% . The maximum power densities measured in humidified H2 and air ranged from ~ 110 mW/cm2 at 600 to 470 mW/cm2 at 800°C.Keywords
This publication has 0 references indexed in Scilit: