NOVELTY - The membrane electrode assembly comprises a proton exchange membrane (401, 402), an anode (404) and a cathode (403) disposed on both sides of the membrane, a conductive catalyst (410) disposed within the proton exchange membrane, and a conductive junction (411) connecting the catalyst and the cathode. The conductive junction has an electrical resistance that is 20 times greater than a protonic resistance of the membrane between the catalyst and the cathode, and comprises a peripheral frame maintaining the proton exchange membrane in a position and a structural piece.    USE - The membrane electrode assembly is useful in a device for electrolysis of water (claimed) for producing hydrogen.    ADVANTAGE - The membrane electrode assembly improves the efficiency of the water electrolysis without diffusion of the proton exchange membrane thus economically producing the hydrogen with high purity.    DETAILED DESCRIPTION - The membrane electrode assembly comprises a proton exchange membrane (401, 402), an anode (404) and a cathode (403) disposed on both sides of the membrane, a conductive catalyst (410) disposed within the proton exchange membrane, and a conductive junction (411) connecting the catalyst and the cathode. The conductive junction has an electrical resistance that is 20 times greater than a protonic resistance of the membrane between the catalyst and the cathode, and comprises a peripheral frame maintaining the proton exchange membrane in a position and a structural piece that has an electrical resistivity of greater than 20 mu Omega .cm at 293.15 K. The catalyst is adapted to oxidize hydrogen, and comprises titanium fixed on a support made of conductive graphite. The support made of conductive graphite is fixed at a first layer of the proton exchange membrane integral with the cathode and at a second layer of the proton exchange membrane integral with the anode. The protonic resistance of the first layer of proton exchange membrane is less than the protonic resistance of the second layer of the proton exchange membrane. The proton exchange membrane comprises a third proton exchange layer. The cathode is fixed on the first layer. The anode is fixed on the third exchange layer. The catalyst is a first catalyst disposed between the first and second exchange layers. The assembly further comprises a second catalyst disposed between the second and third exchange layers, and another conductive junction connecting the second catalyst and the anode. An INDEPENDENT CLAIM is included for a device for electrolysis of water.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an electrolysis device incorporating a membrane electrode assembly.    Proton exchange membrane (401, 402)    Cathode (403)    Anode (404)    Conductive catalyst (410)    Conductive junction. (411)