1. 1 S. C. Singhal , “Advances in Solid Oxide Fuel Cell Technology,” Solid State Ionics, 135, 305-13 (2000).
2. 2 A. Boudghene Stambouli and E. Traversa , “Solid Oxide Fuel Cells (SOFCs): A Review of an Environmentally Clean and Efficient Source of Energy,” Renew. Sust. Energy Rev., 6, 433-55 (2002).
3. 3 B. C. H. Steele , “Appraisal of Ce1−yGdyO2−y/2 Electrolytes for IT-SOFC Operation at 500°C,” Solid State Ionics, 129, 95-110 (2000).
4. 4 N. P. Brandon , S. Skinner , and B. C. H. Steele , “Recent Advances in Materials for Fuel Cells,” Annu. Rev. Mater. Res., 33, 183-213 (2003).
5. 5 T. Ishihara , H. Matsuda , and Y. Takita , “Effects of Rare Earth Cations Doped for La Site on Oxide Ionic Conductivity of LaGaO3-Based Perovskite Type Oxide,” Solid State Ionics, 79, 147-51 (1995).