NOVELTY - A solid oxide fuel cell (SOFC) device (10) comprises an elongate substrate having a reaction zone (32) along a first portion of its length and cold zone(s) (30) along a second portion of length; several fuel passages (14) in substrate extending from cold zone to reaction zone, each having an associated anode (24) in reaction zone; several oxidizer passages (20) in substrate extending from cold zone to reaction zone, each having an associated cathode (26) in reaction zone positioned in opposing relation to anode; and an electrolyte (28) disposed between anode and cathode in reaction zone.    USE - In a solid oxide fuel cell system (claimed).    ADVANTAGE - The SOFC device (SOFC Stick (RTM: solid oxide fuel cell device)) is capable of having cold ends while the center is hot. Slow heat conduction of ceramic prevents the hot center from fully heating the colder ends. By having cold ends for connection, it is possible to make easier connection to the anode, cathode, fuel inlet and outlet, and air inlet and air outlet. The device has the thermal property that allows it to heated in the center and still have cool ends, which makes it relatively easy to connect fuel, air and electrodes and is a stand-alone system needing only heat, fuel and air to be added to make electricity and the components of the device are readily attached. The device is monolithic, which helps to make it structurally sound with temperature and lends itself to traditional high volume manufacturing technique such as used in MLCC (multi-layer co-fired ceramic) production of capacitor chips. Thin electrolyte layers are achieved within the structure at no additional cost or complexity and the device is more efficient and offers the largest area and greater density. The device provides a greater variety of electrode options compared with the prior art. The SOFC Stick device can be about 30 times more efficient than a SOFC tube.    DETAILED DESCRIPTION - A solid oxide fuel cell device (10) comprises an elongate substrate having a length that is the greatest dimension such that substrate has a coefficient of thermal expansion having only one dominant axis that is coextensive with the length, a reaction zone (32) along a first portion of the length configured to be heated to an operating reaction temperature, and at least one cold zone (30) along a second portion of the length configured to remain at a low temperature below the operating reaction temperature when the reaction zone is heated; several fuel passages (14) in the elongate substrate extending from the at least one cold zone to the reaction zone, and each having an associated anode (24) in the reaction zone; several oxidizer passages (20) in the elongate substrate extending from the at least one cold zone to the reaction zone, each having an associated cathode (26) in the reaction zone positioned in opposing relation to a respective one of the associated anodes; and an electrolyte (28) disposed between each of the opposing anodes and cathodes in the reaction zone. INDEPENDENT CLAIMS are included for the following:    (1) a solid oxide fuel cell system;    (2) a method of using the device;    (3) a method of using the system.    DESCRIPTION OF DRAWING(S) - The figure shows a side cross-sectional view of SOFC Stick device.    device (10)    fuel inlet (12)    fuel passage (14)    fuel outlet (16)    air inlet (18)    air passage (20)    air outlet (22)    anode (24)    cathode (26)    electrolyte (28)    cold zones (30)    hot zone. (32)