Air electrode and air electrode side current collector for solid oxide fuel cell

摘要

PURPOSE: To provide an air electrode and an air electrode side current collecting plate for an SOFC excellent in the consistency of the linear thermal expansion coefficient with an electrolyte, electric conductivity, and electrode activity. CONSTITUTION: An air electrode and an air electrode side current collecting plate for an SOFC are made of a conducting ceramic material expressed by (La1-x Yx )1-y Sry }MnO3 , where 0x=0.4, 0.1=y=0.4. A YMnO3 material is dissolved 100% in an LaMnO3 material. The YMnO3 material has a linear thermal expansion coefficient smaller than that of an electrolyte material YSZ, and the LaMnO3 material has a linear thermal expansion coefficient larger than that of the YSZ. When part of the La cyto of a conventional material La1-y Sry MnO3 is substituted with Y, the linear thermal expansion coefficient can be reduced. Excellent electric conductivity and electrode activity are obtained by the Sr doping effect, and excellent consistency of the linear thermal expansion coefficient with an electrolyte is obtained by the Y doping effect.