NOVELTY - The high-temperature water-vapor electrolyzer has electrolyte (1), hydrogen pole (2), oxygen electrode (3), hydrogen pole-side manifold (6), oxygen electrode manifold (7), and hydride generator. Manifold (6) supplies water vapor (18) to pole (2) which decomposes water vapor into hydrogen and oxygen ions. Electrode (3) emits the oxygen ions passing through the electrolyte as oxygen gas (20). Manifold (7) emits the oxygen gas generated in oxygen-electrode side. The hydride generator generates hydride through reduction medium from hydrogen (19).    USE - For generating hydrogen.    ADVANTAGE - The high-temperature water-vapor electrolyzer efficiently converts generated hydrogen into a compound suitable for storage or transport, and reduces energy loss.    DETAILED DESCRIPTION - The high-temperature water-vapor electrolyzer has electrolyte (1), hydrogen pole (2), oxygen electrode (3), hydrogen pole-side manifold (6), oxygen electrode manifold (7), and hydride generator. The hydrogen pole is provided on one surface of the electrolyte, and the oxygen electrode on the other surface. The electrolyzer electrolyzes water vapor using an electrolysis cell (4). The hydrogen pole-side manifold supplies water vapor (18) to the hydrogen pole which decomposes water vapor to produce hydrogen and oxygen ions. The oxygen electrode emits the oxygen ions passing through the electrolyte as oxygen gas (20). The oxygen electrode manifold emits the oxygen gas generated in oxygen-electrode side. The hydride generator generates hydride through a reduction medium from generated hydrogen (19). The reduction medium is hydrocarbon compound, nitrogen oxide, or carbon monoxide. An INDEPENDENT CLAIM is included for electrolysis of high-temperature water vapor.    DESCRIPTION OF DRAWING(S) - The figure shows the longitudinal cross-sectional view of the schematic structure of the high-temperature water-vapor electrolyzer. (Drawing includes non-English language text).    Electrolyte (1)    Hydrogen pole (2)    Oxygen electrode (3)    Electrolysis cell (4)    Hydrogen pole-side manifold (6)    Oxygen electrode manifold (7)    Water vapor (18)    Hydrogen (19)    Oxygen (20)