NOVELTY - Aqueous suspensions are obtained by dry milling organic components in a planetary ball mill in consecutive millings of 2-12 (preferably 6-10) cycles for up to 20 minutes each, with rotation of 100-300 rpm; and processing the resulting material on the ball mill added with a mixture of organic components. The resulting mass is processed in a suspension by addition of water and mechanical homogenization in adequate amounts to the desired viscosity according to a subsequent deposition process.    USE - For obtaining aqueous suspensions for electrodes of solid oxide fuel cells, oxide membrane reactors, and other electrocatalytic devices (claimed).    ADVANTAGE - The process obtains aqueous suspensions with high content of solids which generate electrodes for solid state electrocatalytic devices (e.g., solid oxide fuel cells, oxide membrane reactors and other catalytic devices) and/or surface modified electrodes through the insertion of metallic ions in the hydration water of these (nano) composites in a previous step to the ceramic processing (calcination and sintering).    DETAILED DESCRIPTION - Obtaining aqueous suspensions for electrodes of solid oxide fuel cells and other electrocatalytic devices includes:    (A) dry milling organic components in a planetary ball mill with relation between the mass of material to be processed and the mass of milling balls of 1:2-1:8, preferably 1:3-1:6, with typical occupation of a milling vessel volume of 40-80%, in consecutive millings, typically from 2-12 (preferably 6-10) cycles, of up to 20 minutes each, with rotation from 100-300 rpm; and followed by processing on the planetary ball mill with the addition of a mixture of organic components in the same condition described above, but with a content of 0.01-15 (preferably 0.01-2) mass% of the organic fraction with respect to the active inorganic component.    The resulting mass is processed in a suspension by water addition and by mechanical homogenization in adequate amounts to the desired viscosity according to a subsequent deposition process. An INDEPENDENT CLAIM is included for a suspension obtained by the above process and used to fabricate solid oxide fuel cells, oxide membrane reactors, and other electrocatalytic devices.