Patent ID: 7687090

Claim:
A solid oxide fuel cell device assembly comprising: (i) at least one planar electrolyte sheet; (ii) a plurality of cathodes disposed on one side of the electrolyte sheet; (iii) a plurality of anodes disposed on another side of the electrolyte sheet; and (iv) at least one honeycomb-like frame, the frame supporting the electrolyte sheet and having a periodic array of plurality of parallel channels with openings to enable reactant to flow through the frame such that reactant contacts the cathodes and/or the anodes, and wherein (i) the length of said channels is longer than a width of said channels; and (ii) the ratio ρ hc /ρ solid of effective honeycomb frame density relative to the density of the frame if it was made only from the solid material is ρ hc /ρ solid <=0.45.