NOVELTY - The solid oxide fuel cell device comprises an elongate ceramic tube having an exterior circumferential surface, an interior circumferential surface and an interior structure provided between the surfaces, spaced, concentric annular fuel passages, spaced, concentric annular oxidizer passages, a fuel outlet (16), an oxidizer outlet, an anode, a cathode, an annular solid electrolyte layer, a first voltage connection, a second voltage connection, a fuel supply, an air supply, a heat source, a first insulating region, a second insulating region, and support pillars.    USE - Used as a solid oxide fuel cell device.    ADVANTAGE - The low weight solid oxide fuel cell device can be operated for a longtime without degrading its performance and efficiency, and exhibits high reliability and density.    DETAILED DESCRIPTION - The solid oxide fuel cell device comprises an elongate ceramic tube having an exterior circumferential surface, an interior circumferential surface and an interior structure provided between the surfaces, spaced, concentric annular fuel passages, spaced, concentric annular oxidizer passages, a fuel outlet (16), an oxidizer outlet, an anode, a cathode, an annular solid electrolyte layer, a first voltage connection, a second voltage connection, a fuel supply, an air supply, a heat source, a first insulating region, a second insulating region, and support pillars provided in the fuel and oxidizer passages. The elongate ceramic tube further has: a length that is defined between a first tube end and an opposing second tube end; a first cold end region that is adjacent to the first tube end; a second cold end region that is adjacent to the second tube end; and a reaction zone provided between the first and second cold end regions. The reaction zone is configured to be exposed to a heat source to heat the reaction zone to an operating reaction temperature. The first and second cold end regions are not exposed to the heat source to remain at a low temperature below the operating reaction temperature. The spaced, concentric annular fuel passages extend within the interior structure from the first tube end partially through the reaction zone toward the second tube end. The spaced, concentric annular oxidizer passages extend within the interior structure from the second tube end partially through the reaction zone towards the second tube end in alternating and concentric relation to the fuel passages. The fuel outlet is provided in the reaction zone or the second cold end region extending from an innermost one of the fuel passages to the exterior circumferential surface of the elongate ceramic tube, is fluidically open to each of the fuel passages, and is fluidically closed to the oxidizer passages. The oxidizer outlet is provided in the reaction zone or the first cold end region extending from an innermost one of the oxidizer passages to the exterior circumferential surface of the elongate ceramic tube, is fluidically open to each of the oxidizer passages, and is fluidically closed to the fuel passages. The anode is configured for lining each of the fuel passages in the reaction zone and the first cold end region, and is electrically coupled to a first exterior contact surface on the elongate ceramic tube in the first cold end region. The cathode is configured for lining each of the oxidizer passages in the reaction zone and the second cold end region, and is electrically coupled to a second exterior contact surface on the elongate ceramic tube in the second cold end region. The annular solid electrolyte layer is provided between each of the adjacent fuel and oxidizer passages separating opposing anodes and cathodes. The first voltage connection is provided to the first exterior contact surface, and the second voltage connection is provided to the second exterior contact surface. The first and second voltage connections are wires, which are soldered to the respective first and second exterior contact surfaces and mechanically connected to the respective first and second exterior contact surfaces. The fuel supply is coupled to the first tube end for supplying a fuel flow into the fuel passages. The air supply is coupled to the second tube end for supplying an air flow into the oxidizer passages. The fuel supply and the air supply are coupled by a flexible rubber or plastic tube secured over the respective first and second tube ends. The heat source is positioned between the first and second cold end regions to heat the reaction zone to the operating reaction temperature. The first insulating region is provided between the heat source and the first cold end region, and the second insulating region is provided between the heat source and the second cold end region. The first and second insulating regions are adapted to maintain the first and second cold end regions at the low temperature below the operating reaction temperature. The tube length is greater than a diameter of the elongate ceramic tube, where the elongate ceramic tube exhibits thermal expansion along a dominant axis that is coextensive with the length. INDEPENDENT CLAIMS are included for:    (1) a solid oxide fuel cell system; and    (2) a method of producing electricity without combustion using a solid oxide fuel cell device or system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a cross-sectional view of a solid oxide fuel cell device.    Fuel inlet (12)    Fuel passage (14)    Fuel outlet (16)    Air inlet (18)    Air passage (20)    Air outlet. (22)