High-performance electrode for medium-temperature solid oxide fuel cells: Effects of composition and microstructures on performance of ceria-based anodes
- Yamanashi Univ., Kofu (Japan). Lab. of Electrochemical Energy Conversion
Polarization properties of ceria-based anodes dispersed with nanometer-sized Ru catalysts, which the authors developed for medium-temperature solid oxide fuel cells, were greatly improved by controlling the composition and microstructure. Among samaria-doped ceria (SDC) anodes with compositions of (CeO{sub 2}){sub 1{minus}x}(SmO{sub 1.5}){sub x} (0 {le} x {le} 0.4) a SDC anode with x = 0.2 was found to exhibit the maximum current density at a given overpotential at temperatures of 800 to 1,000 C, when operating under a hydrogen atmosphere. This high current density is a direct result of improved conductivities of both oxide ions ({sigma}{sub ion}) and electrons ({sigma}{sub e}). Attaching a very thin film of SDC onto a yttria-stabilized zirconia electrolyte before coating the Ru-dispersed SDC layer appreciably lowered the anodic overpotential for the SDC. The current densities on the improved Ru-SDC anode at a potential of {minus}0.9 V vs. an air reference electrode were 0.8 and 1.4 A/cm{sup 2} at 800 and 900 C, respectively.
- OSTI ID:
- 599923
- Journal Information:
- Journal of the Electrochemical Society, Vol. 145, Issue 2; Other Information: PBD: Feb 1998
- Country of Publication:
- United States
- Language:
- English
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