SOFCs provide a highly efficient, low-pollution power
generation technology. Performance of tubular SOFCs has been
confirmed by successful operation in several power generation
systems of up to 250 kW size, though their cost still remains to be
reduced. Planar SOFCs, particularly anode-supported, provide much
higher power densities and potentially much lower cost than the
tubular cells. The challenge in commercializing planar SOFCs
offering high power densities requires successful development of
seals for isolating oxidant from fuel, development of low-cost
oxidation-resistant metallic alloys for use as interconnection, and
lower cost. Additionally, for transportation applications, ability for
rapid start up and thermal cycling needs to be developed. When fully
developed, planar SOFCs will have widespread application in the
stationary distributed power generation, transportation and military
market sectors. Systems based on both the tubular and the planar
SOFCs are ideal power generation systems – reliable, clean, quiet,
environmental friendly, and fuel conserving.