Water electrolysis cell and manufacturing method of the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakeshi Nobukawa, Kimihiro Tsuchiya
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Abstract
A water electrolysis cell includes a proton-conducting electrolyte membrane, an anode catalyst layer laminated on one face of the electrolyte membrane, and a cathode catalyst layer laminated on another face of the electrolyte membrane. At least one of the anode catalyst layer and the cathode catalyst layer includes, in an in-plane direction of the anode catalyst layer and the cathode catalyst layer, a portion with a high density of catalyst and a portion with a lower density of the catalyst than the portion with a high density.
Claims1
A manufacturing method of a water electrolysis cell, the manufacturing method comprising:
- placing a backing sheet on a fixing table provided with a plurality of holes;
- forming concave portions on a surface of the backing sheet that are recessed into the holes, by suctioning the backing sheet through the holes;
- applying a catalyst ink to the surface of the backing sheet to obtain a layer of the catalyst ink including convex portions made at positions of the concave portions;
- and
- sandwiching the layer between smooth plates and applying heat and pressure such that an anode catalyst layer or a cathode catalyst layer is obtained in which portions at which the convex portions are compressed become portions exhibiting a higher density of catalyst than other portions.
Dependencies are inferred from the claim text.