TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Method: The method (M2) further comprises selecting an unsintered porous ceramic electrode. The coating steps are carried out by spray coating. The ceramic suspension (preferably electrolyte suspension and the electrode suspension) is applied at a thickness sufficient to produce a coating at least 15 microns thick after sintering. The method (M1) involves providing a porous ceramic substrate; applying a first coating of (S1) to the substrate; drying the coated substrate; applying a second coating of (S1) to the coated substrate; and co-sintering the coated substrate. The step of applying the second coating is carried out while the first coating is wet (preferably after drying and been fired). The method (M1) further comprises applying a second coating of the second suspension to the electrolyte coating before and after co-sintering the coated substrate. Preferred Composition: The powdered ceramic composition of the first ceramic suspension comprises an electrode material and the powdered ceramic composition of the second ceramic suspension comprises an electrolyte material.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electrolyte material is selected from stabilized zirconia composition, doped ceria composition, doped lanthanum gallate, doped alkaline earth cerate, doped alkaline earth zirconate and/or bismuth oxide and the electrode material is selected from nickel oxide/doped zirconia composite, nickel oxide doped ceria, mixture of nickel oxide/doped ceria materials, lanthanum strontium manganite, lanthanum strontium ferrite, lanthanum strontium nickelate and/or lanthanum strontium cobaltite.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The terpineol-based solvent comprises terpineol. The majority solvent is selected from acetone and a non-terpineol alcohol. The electrode interlayer material has a polarity corresponding to the polarity of the porous electrode.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The binder comprises ethyl cellulose. EXAMPLE - Zirconia media (250 ml of 1 cm diameter) and acetone (100 ml) were added to Hypermer KD-1 (RTM: dispersant) (2.25 g). To this solution, zirconium oxide (2-6 mol.%), scandium oxide (1 mol.%), alumina powder (150 g) was added. The resultant slurry was returned to the vibratory mill for 24 hours to assure complete deagglomeration of the powder. The slurry was poured and evaporated at 60degreesC. To this mixture, terpineol-based screen-printing vehicle (80.85 g) was added and stirring continued. When the slurry was again homogenized, the slow evaporation at 60degreesC was continued and electrolyte spray suspension was obtained. Small amounts of terpineol, a terpineol-based solvent or binder system, or the majority solvent were added to the prepared suspension to reduce the suspension viscosity for aerosol or ultrasonic atomization.