Abstract: A water electrolysis system including: a water electrolysis cell; a water supply device that supplies water to an oxygen electrode of the water electrolysis cell; a water supply channel that connects the water electrolysis cell and the water supply device and through which the water supplied from the water supply device to the oxygen electrode flows; a gas-liquid separator that separates the water and a gaseous component discharged from the oxygen electrode; a water discharge channel that connects the water electrolysis cell and the gas-liquid separator and through which the water and a gaseous component discharged from the oxygen electrode flow; and a recombiner disposed between the water electrolysis cell and the gas-liquid separator in the water discharge channel. The recombiner includes a recombination catalyst that reacts hydrogen and oxygen, and the water electrolysis cell and the recombiner are electrically insulated from each other.

Abstract: A membrane electrode assembly includes a cathode catalyst layer, an anode catalyst layer, an electrolyte layer disposed between the cathode catalyst layer and the anode catalyst layer and an intermediate layer disposed between the anode catalyst layer and the electrolyte layer. The intermediate layer includes a carrier with an insulating property, and a recombination catalyst supported on the carrier with the insulating property.

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.

Abstract: One or more methods of fabricating a microscale canopy wick structure having an array of individual wicks having one or more canopy members. Each method includes selectively etching a substrate to control the thickness of the canopy members and also control the width of a fluid flow channel between adjacent wicks in a manner that enhances the overall performance of the microscale canopy wick structure.

Abstract: One or more methods of fabricating a microscale canopy wick structure having an array of individual wicks having one or more canopy members. Each method includes selectively etching a substrate to control the thickness of the canopy members and also control the width of a fluid flow channel between adjacent wicks in a manner that enhances the overall performance of the microscale canopy wick structure.

Abstract: A heat storage material has a high hydration capacity, which does not readily deliquesce and can be effectively used. A method produces such a heat storage material, and a chemical heat pump and heat storage method use such a heat storage material. The heat storage material is a composite metal halide including a monovalent metal, a divalent metal, and a halogen. The method for producing the heat storage material includes preparing a mixture in which a monovalent metal halide and a divalent metal halide hydrate are mixed, and generating the composite metal halide by subjecting the mixture to a heat treatment. The chemical heat pump includes a water storage unit storing water as a working medium, a heat storage material retention unit retaining the heat storage material, and a water vapor flow path allowing water to flow vapor between the water storage unit and the heat storage material retention unit.