NOVELTY - The gas diffusion electrode (18a, 18b) for high temperature gas cells based on electrolyte-impregnated membrane, comprises a gas diffusion layer (22a, 22b) and a porous catalyst layer (20a, 20b) arranged on the gas diffusion layer and having an electrically conductive substrate and a catalytic material applied on the substrate. The gas diffusion layer and/or a micro-porous layer present between the gas diffusion layer and the catalyst layer contain a hydrophobic material (28), which has hydrophobicity corresponding to a contact angle with water of 110 degrees .    USE - Gas diffusion electrode useful in a membrane electrode unit for gas cells for mobile applications, for traction systems or for the additional energy supply of motor vehicles, and for a gas cell for small power stations or house-energy supplying facility (all claimed).    ADVANTAGE - The gas diffusion electrode is capable of having a better performance in temperature below of 100 degrees C and can be usable over a wider temperature range, thus improving the efficiency of a membrane electrode unit.    DETAILED DESCRIPTION - The gas diffusion electrode (18a, 18b) for high temperature gas cells based on electrolyte-impregnated membrane, comprises a gas diffusion layer (22a, 22b) and a porous catalyst layer (20a, 20b) arranged on the gas diffusion layer and having an electrically conductive substrate and a catalytic material applied on the substrate. The gas diffusion layer and/or a micro-porous layer present between the gas diffusion layer and the catalyst layer contain a hydrophobic material (28), which has hydrophobicity corresponding to a contact angle with water of 110 degrees , a mass portion of 10-20 wt.% related to the total mass of the catalytic material and the substrate, and a concentration gradually or step-wisely decreasing toward the gas diffusion layer and is homogeneously distributed within the catalyst layer. An INDEPENDENT CLAIM is included for a membrane electrode unit.    DESCRIPTION OF DRAWING(S) - The diagram shows a detailed representation of a diaphragm-electrode-unit.    Gas diffusion electrode (18a, 18b)    Porous catalyst layer (20a, 20b)    Gas diffusion layer (22a, 22b)    Electrolyte (26)    Hydrophobic material. (28)