Performance of Reduced-Temperature SOFC Stacks

Abstract

AlliedSignal has been developing low-cost, high-performance solid oxide fuel cells (SOFCs) operating at reduced temperatures (600° to 800°C). The technology is well suited for use in a variety of power systems, ranging from commercial cogeneration to military mobile power plants. The AlliedSignal SOFC design is based on stacking thin-electrolyte cells (made by tape calendering) with metallic interconnect assemblies to form a lightweight, compact structure. This SOFC technology is not only cost effective but also suitable for scaleup in high-volume production using commercially available equipment. To date, the feasibility of fabrication and operation of stacks based on this technology has been demonstrated. Excellent stack performance has been achieved (e.g., 670 mW/cm2 at 800°C) with stack power density exceeding 1 kW/kg. This paper discusses the technical status of the design, manufacture, and performance of AlliedSignal reduced-temperature SOFC stacks.