NOVELTY - The hydrogen production cell comprises a cell for electrolyzing the water vapor at high temperature comprising a porous cathode (404), a porous anode (402) and a dense anionic conductive electrolyte (403) impermeable to gases. The electrolysis cell is directly coupled in series to a cell of an electrochemical pump comprising a porous anode, a porous cathode and a dense proton conducting electrolyte and impermeable to gases. The cathode of the electrolysis cell and the anode of the electrochemical pump are assembled by a porous thick intermediate layer (405).    USE - The cell is useful for production of hydrogen.    ADVANTAGE - The cell is simple and compact thus capable of economically and efficiently producing the hydrogen with high yield and less consumption of energy.    DETAILED DESCRIPTION - The hydrogen production cell comprises a cell for electrolyzing the water vapor at high temperature comprising a porous cathode (404), a porous anode (402) and a dense anionic conductive electrolyte (403) impermeable to gases. The electrolysis cell is directly coupled in series to a cell of an electrochemical pump comprising a porous anode, a porous cathode and a dense proton conducting electrolyte and impermeable to gases. The cathode of the electrolysis cell and the anode of the electrochemical pump are assembled by a porous thick intermediate layer (405) having an open porosity of 20-90 vol.% and a thickness of 0.05-5 mm. The intermediate layer is made of an electronically conductive material, which is same as the cathode of the electrolysis cell but different from the anode material of the electrochemical pump, or the material of the intermediate layer is chemically compatible with the cathode material of the electrolysis cell. The porosity of the intermediate layer is greater than the porosity of the cathode of the electrolysis cell and porosity of the anode of the electrochemical pump. When the hydrogen production cell is present in a planar geometry, then the cell comprises a stack comprising a bipolar plate or internal interconnector, the porous anode of the electrolysis cell, the dense anionic conductive electrolyte, the porous cathode of the electrolysis cell, thick porous intermediate layer, the porous anode of the electrochemical pump, dense proton conducting electrolyte, porous cathode of the electrochemical pump, and a bipolar plate or external interconnector. When the hydrogen production cell is present in a tubular geometry, then the cell comprises a metal tube (401) and successive layers disposed around a side surface of the metal tube including the porous anode of the electrolysis cell, the dense electrolyte of the electrolysis cell, the porous cathode of the electrolysis cell, the thick porous intermediate layer, the porous anode of the electrochemical pump, the dense electrolyte of the electrochemical pump, the porous cathode of the electrochemical pump and an external metal tube. One of the longitudinal ends of the tubes is closed, and the other ends are provided with a sealed unit.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic semi cross-sectional view of hydrogen production cell.    Metal tube (401)    Porous anode of the electrolysis cell (402)    Dense electrolyte of the electrolysis cell (403)    Porous cathode of the electrolysis cell (404)    Porous thick intermediate layer. (405)