NOVELTY - A solid oxide fuel cell device (10) comprises an elongated substrate having a longer length than width and thickness of the device such the device is divided into a hot zone (32) in the center of the device, at least cold zone (30) at each end of the device and a transition zone (31) between the hot zone and cold zone; and an electrolyte (28) disposed between an anode (24) and a cathode (26) in the hot zone.    USE - In a solid oxide fuel cell system (claimed).    ADVANTAGE - In the device, colder ends are quickly radiated away any heat that arrives there, it is possible to make easier connection to the anode, cathode, a fuel inlet and outlet and air inlet and outlet. The device has the thermal property that allows it to heated in the center and still have cool ends, which makes ot 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 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.    DETAILED DESCRIPTION - A solid oxide fuel cell device (10) comprises an elongate substrate having a longer length than width and thickness of the device such that the substrate has a coefficient of thermal expansion having only one dominant axis that is coextensive with the length; a hot zone (32) along a first portion of the length and at least one cold zone (30) along a second portion of the length; and an electrolyte (28) disposed between an anode (24) and a cathode (26) in the hot zone. Each of the anode and cathode has an electrical pathway extending to an exterior surface of the at least one cold zone for electrical connection at the low temperature below the temperature of the hot 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(RTM: device) device.    device (10)    fuel inlet (12)    fuel passage (16) fuel outlet (14)    air inlet (18)    air passage (20)    air outlet (22)    anode (24)    cathode (26)    electrolyte (28)    ceramic (29)    cold zones (30)    transition zone (31)    hot zone (32)    fuel supply. (34)