Electrolysis unit, separator and hydrogen production apparatus

Abstract

This invention relates to an electrolysis unit used in a hydrogen production apparatus for producing hydrogen from a conductive fluid containing water. The electrolysis unit comprises: an ion exchange membrane having a first main surface and a second main surface located opposite the first main surface in the thickness direction; an anode portion disposed in contact with the first main surface and supplied with the conductive fluid; and a cathode portion disposed in contact with the second main surface to produce hydrogen from water contained in the conductive fluid. Each of the anode and cathode portions includes: a separator comprising a plate-shaped central portion having conductivity and a plate-shaped outer peripheral portion surrounding the central portion; and an electrode disposed between the central portion and the ion exchange membrane, facing the central portion. An opening is formed in the outer peripheral portion of at least one of the anode and cathode portions for supplying the conductive fluid or discharging the hydrogen; and a flow path connecting the opening to the central portion. At the aforementioned central portion, a plurality of groove portions communicating with the aforementioned flow path are formed at intervals in the width direction. At least one recess is formed on the electrode-facing surface located between the plurality of the aforementioned groove portions and serving as the surface of the aforementioned central portion.

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