Abstract: A water electrolysis system controls a power supply device for passing a current between an anode and a cathode in a water electrolysis stack, based on a hydrogen concentration detected by a concentration sensor provided in a discharge pipe at a location downstream of a pressure control valve.

Abstract: A regenerative fuel cell system includes a supply mechanism for supplying gas generated by a pressurization apparatus to a fuel cell, and a control apparatus. The supply mechanism includes a flow regulating valve provided in a gas supply path, and a pressure sensor that detects pressure of the gas supplied to the gas supply path. When a pressurization-stop operation is started, the control apparatus adjusts the flow rate of the flow regulating valve to realize a target depressurization rate, and causes the fuel cell to generate power corresponding to the flow rate.

Abstract: A water electrolysis system includes a water supply unit, a KOH tank, a water electrolysis apparatus, and a control device. The water supply unit and the KOH tank supply an aqueous solution containing hydroxide ions of a predetermined concentration to a cathode of the water electrolysis apparatus. The water electrolysis apparatus includes a solid polymer electrolyte membrane, and a water electrolysis cell having an anode and a cathode provided on both sides of the solid polymer electrolyte membrane. The control device changes the voltage to increase while restricting a supply amount of a KOH aqueous solution to the cathode when a concentration of the KOH aqueous solution is higher than a predetermined reference concentration on the basis of information on correspondence between a voltage and current between the anode and the cathode and the concentration of the KOH aqueous solution on the cathode.

Abstract: An electrochemical cell of an electrochemical hydrogen compressor is provided with a first flow field member having a hydrogen gas flow field and a second flow field member having a water channel. The first flow field member is located between the anode electrode and the anode separator. The second flow field member is located between the anode electrode and the first flow field member. A first porous member is located between the first flow field member and the second flow field member. A second porous member is located between the second flow field member and the anode electrode.

Abstract: An anode current collector of an electrochemical cell includes an inner portion in which a first hole is formed, and an outer portion located outside the inner portion and in which a second hole is formed. The first hole has a cross-sectional area that increases toward a supply flow path, and the second hole has a cross-sectional area that increases toward an electrolyte membrane.

Abstract: Provided is a cooling structure of a vehicle, which suppresses air stagnation in the motor when manufacturing, and improves productivity, while maintaining cooling efficiency of a motor.

Abstract: An electrochemical hydrogen compressor and a support member for an electrochemical cell include, in a flow field member, flow field grooves through which an anode gas (for example, a hydrogen gas) is allowed to flow in a predetermined direction, and a plurality of through holes one ends of which open in the flow field grooves, and other ends of which are in communication with ventilation holes of an anode current conductor. At least a portion of the through holes (for example, discharge through holes) are inclined at an acute angle with respect to an upstream side of the flow field grooves (for example, discharge flow field grooves).

Abstract: An electrochemical cell of an electrochemical hydrogen compressor is provided with a first flow field member having a hydrogen gas flow field and a second flow field member having a water channel. The first flow field member is located between the anode electrode and the anode separator. The second flow field member is located between the anode electrode and the first flow field member. A first porous member is located between the first flow field member and the second flow field member. A second porous member is located between the second flow field member and the anode electrode.

Abstract: An electrochemical hydrogen compressor comprises a unit cell that includes: an electrolyte membrane having hydrogen ion conductivity; an anode current collector stacked on one main surface side of the electrolyte membrane, a support member (for example, a flow field member or an anode separator) arranged so as to face the anode current collector; and a cathode current collector stacked on another main surface side of the electrolyte membrane, wherein the anode current collector is formed of a hydrophilic conductive material having a plurality of vent holes and has a surface facing the support member, the surface being subjected to a water-repellent treatment.

Abstract: Provided is a cooling structure of a vehicle, which suppresses air stagnation in the motor when manufacturing, and improves productivity, while maintaining cooling efficiency of a motor.