Durability Study of Double Perovskite Cathode Materials for Intermediate Temperature-Solid Oxide Fuel Cells

Abstract

Solid oxide fuel cells (SOFCs) are the electrochemical power generation devices that convert chemical energy into electrical energy directly, providing several advantages of fuel flexibility, low pollutant emission, environmental friendliness, high power density, and high efficiency. Recently, the long-term durability has been major concerns for making commercialization of SOFC systems. One of methods to mitigate these issues is to decrease the high operation temperature to the low or intermediate temperature through the use of advanced electrolytes and electrodes. Lower operating temperature is possibly able to enhance stability and economic feasibility of SOFCs. In this work, hence, we investigate the durability of Ni-cermet anode-supported neodymium-doped ceria (Nd0.1Ce0.9O2-δ, NDC) electrolyte cells at the practical SOFC operating condition of 650 oC. In addition, double perovskite structure-based materials are considered as the candidate cathode materials, due to their high electrochemical properties with the excellent stability, and compared to that of single perovskite structured cathode materials. References Lowering the temperature of solid oxide fuel cells, E. D. Wachsman, and K. T. Lee, Science , 334, 935 (2011).Fundamental mechanisms limiting solid oxide fuel cell durability, H. Yokokawa, H. Tu, B. Iwanschitz and A. Mai, J. Power sources, 182, 400 (2008).Durability test of SOFC cathodes, M. J. Jørgensen, P. Holtappels and C. C. Appel, Applied Electrochemistry, 30, 411 (2000). Keywords: solid oxide fuel cells, cathode, double perovskite structure, durability, ceria.