Fuel Cell Device And System

A fuel cell device comprising an elongate substrate having a length that is the greatest dimension whereby the elongate 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, at least one cold zone along a second portion of the length configured to not be exposed to the heat source to remain at a low temperature below the operating reaction temperature when the reaction zone is heated, at least one fuel passage in the elongate substrate extending from the at least one cold zone to the reaction zone, and having an associated anode in the reaction zone, at least one oxidizer passage in the elongate substrate extending from the at least one cold zone to the reaction zone,and having an associated cathode in the reaction zone positioned in opposing relation to the anode, and an electrolyte disposed between the opposing anode and cathode in the reaction zone, the anode and cathode each having an electrical pathway extending to an exterior surface of the at least one cold zone for electrical connection at the low temperature below the operating reaction temperature, characterized in that the electrolyte includes at least a nano-portion comprising a ceramic material sintered from a nano- sized powder.