NOVELTY - A reformer-supported solid oxide fuel cell has a reformer including an electroconductive mixture of an active material and a polymeric ceramic material shaped to constitute a slab having upper and lower surfaces and grooves, and flat regions; an anode sprayed onto the grooves of the slab; an electrolyte sprayed onto the anode and the flat regions of the slab; and a cathode sprayed onto the electrolyte, over the grooves of the slab.    USE - The inventive cell is used as an auxiliary power unit for use in transportation applications. It is used for converting chemical energy in fuels (e.g., hydrogen, methane, butane or even gasoline and diesel) into electrical energy.    ADVANTAGE - The inventive cell is designed to operate under medium temperature, e.g. approximately 500-700degreesC.    DETAILED DESCRIPTION - A reformer-supported solid oxide fuel cell comprises a reformer including an electroconductive mixture of an active material and a polymeric ceramic material shaped to constitute a slab having an upper surface and a lower surface and grooves along at least one of the upper and lower surfaces, and flat regions on at least a section of a periphery of the groove surface; an anode sprayed onto the grooves of the reformer slab; an electrolyte sprayed onto the anode and the flat regions of the reformer slab; and a cathode sprayed onto the electrolyte, over the grooves of the reformer slab. An INDEPENDENT CLAIM is also included for a method of preparing a reformer-supported solid oxide fuel cell, comprising shaping a mixture of an active material and a polymeric ceramic material under conditions to constitute a reformer slab having grooves on surface(s) and a flat region extending at least partially in a periphery of the slab; depositing an anode material onto the grooved surface of the slab, where the anode material extends short of the flat regions; depositing an electrolyte material onto the anode material and the flat regions; and depositing a cathode material onto the electrolyte material, where the cathode material covers the same surface area than the anode material.