NOVELTY - The membrane-electrode assembly (102) comprises a catalyzed anode material (302), a membrane (304) disposed in face-sharing contact with the anode material, and a catalyzed cathode material (306) disposed in face-sharing contact with the membrane and opposite to the catalyzed anode material. The membrane comprises mutually interpenetrating first and second phases, where the first phase supports an ionic conduction comprising proton conduction through the membrane and the second phase supports a dimensional structure of the membrane. The second phase comprises an open-cell pore structure.    USE - The membrane-electrode assembly is useful for fuel cell (claimed) such as high-temperature polymer-electrolyte membrane fuel cell.    ADVANTAGE - The membrane-electrode assembly has sufficient rigidity thus lessening or avoiding the creeping due to an inhomogeneous compressive force of the fuel cell flow plates, and can be economically and simply manufactured with improved membrane/electrode/flow plate contact by preventing hard stops on the flow field plates.    DETAILED DESCRIPTION - The membrane-electrode assembly (102) comprises a catalyzed anode material (302), a membrane (304) disposed in face-sharing contact with the anode material, and a catalyzed cathode material (306) disposed in face-sharing contact with the membrane and opposite to the catalyzed anode material. The membrane comprises mutually interpenetrating first and second phases, where the first phase supports an ionic conduction comprising proton conduction through the membrane and the second phase supports a dimensional structure of the membrane. The second phase comprises an open-cell pore structure, and the first phase partly penetrates the pore structure. The second phase has greater than 50 vol.% of porosity. The catalyzed anode material is configured to oxidize hydrogen to protons, where the membrane is configured to conduct protons. The catalyzed cathode material is configured to reduce oxygen and protons to water. The second phase comprises a filamentous or capillary-like material configured to transport the phosphoric acid from a relatively acid-rich area of the membrane to a relatively acid-dry area of the membrane. INDEPENDENT CLAIMS are included for:    (1) a fuel cell; and    (2) a method to make a membrane-electrode assembly.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a membrane-electrode assembly.    Membrane-electrode assembly (102)    Catalyzed anode material (302)    Membrane (304)    Catalyzed cathode material. (306)