Solid oxide fuel cell device and system

A solid oxide fuel cell device comprising:

• an elongate ceramic substrate having an exterior surface, an interior solid ceramic support structure and a length that is the greatest dimension whereby the elongate ceramic substrate exhibits thermal expansion along a dominant axis that is coextensive with the length, a reaction zone along a first portion of the length configured to be exposed to a heat source to heat the reaction zone to an operating reaction temperature, and at least one cold zone along a second portion of the length configured to be shielded from the heat source to remain at a low temperature below the operating reaction temperature when the reaction zone is heated;
• a plurality of fuel passages extending within the interior solid ceramic support structure of the elongate ceramic substrate from the at least one cold zone to the reaction zone, and each having an associated anode in the reaction zone;
• a plurality of oxidizer passages extending within the interior solid ceramic support structure of the elongate ceramic substrate from the at least one cold zone to the reaction zone, each having an associated cathode in the reaction zone positioned in opposing relation to a respective one of the associated anodes;
• and
• an electrolyte disposed between each of the opposing anodes and cathodes within the interior solid ceramic support structure in the reaction zone, the electrolyte being monolithic with the interior solid ceramic support structure.