TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The metal salt is heated to the molten state and then brought into contact with the solvent flooded porous structure. The molten metal salt is brought into contact with the porous structure by submerging the porous structure into a bath of the molten salt. The flooded porous structure is brought into contact with the metal salt, and then the combined composition heated to melt the salt and evaporate the solvent. The resulting infiltrated structure is further processed to convert the salt to a desired composition. The nitrate salts are converted to a catalyst comprising La-Sr-Mn-oxide by firing the structure in air at 650 degrees C for 10 minutes. The process is carried out at atmospheric pressure. Preferred Components: The metal salt is a mixture of metal salts (preferably metal nitrates, metal chlorides, metal hydroxides, metal acetates and/or metal citrates, especially metal nitrate). The metal nitrate is a mixture of nitrates comprising nitrates of La, Sr, Mn, Cu, Co, Cr, Ni, Ce, Gd, Fe, Sm, Pr, Y and/or Ca. The metal salt is a mixture of La-nitrate, Sr-nitrate and Mn-nitrate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent has a low viscosity and boils at the processing temperature of the molten salt. The solvent is selected from water, acetone, ethanol, isopropyl alcohol and/or hexane. EXAMPLE - A tubular, metal-supported solid oxide fuel cell structure was fabricated from yttria-stabilized zirconia (YSZ) and ferritic stainless steel metal. The structure comprised porous metal/porous YSZ/dense YSZ/porous YSZ/porous metal. The ends of the cell were masked with aqueous acrylic and dried to prevent short-circuiting of the infiltrated catalyst from the inside of the tube to the outside of the tube. The cell was then dipped in acetone, which flooded the pores of the porous YSZ and metal layers. The cell was then transferred immediately into a bath of molten nitrates, held at 105 degrees C. The bath consisted of Triton-X 45 (RTM: surfactant) (0.3 g), La-nitrate (12 g), Mn-nitrate (9.8 g), and Sr-nitrate (1.08 g). Upon dipping the cell into the molten nitrate bath, the acetone boiled off in a few seconds and molten nitrate flooded the pores of the cell. The nitrate salts were then converted to La-Sr-Mn-Oxide catalyst by firing in air at 650 degrees C for 10 minutes. The cell was then tested in oxygen generator mode in air at 700 degrees C. The cell was run with the outside electrode as cathode and inside electrode as anode. The low ohmic and electrode impedance indicated sufficient infiltration of the catalyst into the YSZ pores. The cell polarization at 500 mA/cm2 was 0.41V. The present cell, infiltrated by the solvent-based method, performed nearly as well as the best of the vacuum-infiltrated cells.