Progress in Metal-Supported SOFCs

摘要

Metal-supported SOFCs offer considerable cost and robustness advantages over traditional SOFC designs. This paper presents an overview of progress at LBNL and puts it in the context of the metal-supported SOFC field. In particular, the following topics will be addressed: - Advantages of the metal-supported design - Materials choice for electrolyte and metal support - Acceptable operating temperature range - Fabrication methods - Degradation mechanisms, including Cr migration, metal oxidation, anode-support interdiffusion, etc LBNL has demonstrated competitive power density and promising thermal shock and redox cycling tolerance for YSZ-based metal-supported cells. One cell design utilizes infiltrated anode and cathode catalysts coating porous, sintered YSZ electrode backbones. Our early work demonstrated high power density with infiltrated Ni anodes. Maximum power densities of >330mW/cm2 and >1000mW/cm2 were achieved with air and oxygen as oxidant, respectively, at 700°C. Ni coarsens rapidly in fuel atmosphere, so we now use more stable oxide-based anode materials. Very promising stability at moderate power density (>200mW/cm2) will be reported, along with an overview of our cell scale-up efforts.