(WO9211662-A1)      A fuel cell comprises a first electrode assembly permeable to a fuel and an oxidiser; a second electrode assembly impermeable to the fuel and the oxidiser, and sepd from the first electrode assembly by and in contact with a solid electrolyte body. The solid electrolyte body consists of an electron-insulating material which is also ionically conducting to, at least, a first ionic species and which material is permeable to the fuel, the oxidiser and prods of electrochemical reactions of the fuel and oxidiser.    The first electrode assembly comprises spaced-apart portions that expose surface regions of the solid electrolyte body. A coating on the spaced-apart regions comprises a material relatively permeable to the fuel but impermeable to the oxidiser. Pref. the coating comprises a polymer material selected from nylon, polysulphone, polytrifluorochloroethylene and polypropylene.    USE/ADVANTAGE -   Increased efficiency solid electrolyte fuel cell, achieved by patterning a permeable catalytic electrode with a coating that is permeable to the fuel but relatively impermeable to the oxidiser. The oxidiser enters the surface of a solid electrolyte mainly via the spaces between the electrode portions.    (JP5508962-W)      Fuel cell comprises a first electrode assembly permeable to a fuel and an oxidiser; a second electrode assembly impermeable to the fuel and the oxidiser, and sepd. from the first electrode assembly by and in contact with a solid electrolyte body. The solid electrolyte body consists of an electron-insulating material which is also ionically conducting to, at least, a first ionic species and which material is permeable to the fuel, the oxidiser and prods. of electrochemical reactions of the fuel and oxidiser.    The first electrode assembly comprises spaced-apart portions that expose surface regions of the solid electrolyte body. A coating on the spaced-apart regions comprises a material relatively permeable to the fuel but impermeable to the oxidiser. Pref. the coating comprises a polymer material selected from nylon, polysulphone, polytrifluorochloroethylene and polypropylene.    USE/ADVANTAGE -   Increased efficiency solid electrolyte fuel cell, achieved by patterning a permeable catalytic electrode with a coating that is permeable to the fuel but relatively impermeable to the oxidiser. The oxidiser enters the surface of a solid electrolyte mainly via the spaces between the electrode portions.