Planar Solid Oxide Fuel Cells: From Materials to Systems
In this article, recent technology updates regarding planar type solid oxide fuel cells (SOFCs) are reviewed. Intermediate-temperature operation of SOFCs is a recent R&D trend because of such advantages as cost effectiveness due to the use of low-cost metallic parts and thermal cycle ability. Materials are related to cell performance and operating temperatures, and stack designs are related to hot modules and system design. Also, “reforming” is an important issue for the achievement of high-efficiency SOFC systems.
Based on Toho’s wide range of experience from materials to 1 kW systems for small-scale stationary applications, a case example is suggested for developing mini-or micro-fuel cells. Topics of discussion include reducing the operating temperature of an electrolyte-supported SOFC 1,000°C to 800°C with a newly developed ScSZ electrolyte; the development of compact SOFC stacks with metallic interconnect plates; the examination of a catalytic partial oxidation (CPOx) reformer and steam reforming fuel processor for pipeline city gas fuel; and important issues for the realization of high-efficiency and cost-effective SOFC systems.
KeywordsSolid Oxide Fuel Cell Ferritic Stainless Steel Polymer Electrolyte Fuel Cell Catalytic Partial Oxidation Thin Electrolyte
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