Abstract
Abstract A solid oxide fuel cell (SOFC) stack concept is described which comprises “condensed-tubes” like extruded honeycomb sections of ceramic electrolyte (ZrO2-based) and interconnectors of nickel sheet as key elements. According to this concept, well known and extensively tested construction principles can be realised in a low-cost production. The cells are self-supported with in-plane conduction. A demonstrator model stack of five honeycomb elements and six nickel sheet seals/interconnectors was built and operated for 860 h at 1000°C. Volumetric power densities of 160 kW/m3 were obtained with H2 vs. air, of close to 200 kW/m3 with H2 vs. O2.
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