An exhaust moisture removal system for an electric generation system including: a sorbent wheel; an interchanger; a hydrogen evaporator including an exhaust portion; and an exhaust outflow stream passageway configured to convey an exhaust from a hydrogen fuel cell of the electric generation system through a first pass and then through a second pass, the second pass being located downstream of the first pass, wherein the first pass of the exhaust outflow stream passageway passes through the sorbent wheel, then through the interchanger, and then through the hydrogen evaporator, and wherein the second pass of the exhaust outflow stream passageway passes through the hydrogen evaporator, then through the interchanger, and then through the sorbent wheel.

A fuel cell assembly includes a pair of corrugated bipolar plates. Each of the plates is defined by peak portions and sidewalls connecting the peak portions. The plates are fitted and nested within each other such that the sidewalls are in direct contact. Some of the sidewalls include a stepped shoulder portion such that each of the some of the sidewalls and the peak portions adjacent thereto form a stair-step profile and define a flow channel having a depth greater than a width.

A metal-air battery includes a battery module configured to provide electricity by oxidation of a metal and reduction of oxygen in air; and a first air purifier in fluid communication with the battery module and including a condenser configured to condense moisture in the air and remove the condensed moisture.

An electrochemical cell includes a plurality of components including a membrane electrode assembly including gas diffusion layers, catalyst layers, an exchange membrane, and bipolar plates, the cell being preset to have a target operational relative humidity (RH), and a humidity stabilization system located in or adjacent to at least one of the plurality of components, the system including a hygroscopic material having a critical relative humidity (CRH) value equal to or greater than the target operational RH of the cell.

In pore diameter distribution curves of a first stack body formed by stacking a first gas diffusion layer and a first porous layer of an anode, and of a second stack body formed by stacking a second gas diffusion layer and a second porous layer of a cathode, on a region where a pore diameter is smaller than a reference pore diameter at which a pore volume is maximum, both the curves coincide with each other for the most part. On a region where the pore diameter is equal to or larger than the reference pore diameter, the distribution curve of the second stack body lies above that of the first stack body. A pore volume ratio which is a ratio of the total pore volume of the second stack body to the total pore volume of the first stack body is in the range of 1.10 to 1.60.

A fuel cell including: a membrane-electrode assembly including: a proton-exchange membrane, and a cathode in contact with a first surface of the membrane; two bipolar plates between which the membrane-electrode assembly is arranged, the bipolar plates including at least one first flow collector passing through same, in communication with the cathode; the membrane-electrode assembly includes a first active area covered by the cathode, and a first connection area not covered by the cathode and arranged between the first flow collector and the first active area; the membrane-electrode assembly also includes a first hydrophilic component arranged in the first connection area.

An exhaust moisture removal system for an electric generation system including: a sorbent wheel; an interchanger; a hydrogen evaporator including an exhaust portion; and an exhaust outflow stream passageway configured to convey an exhaust from a hydrogen fuel cell of the electric generation system through a first pass and then through a second pass, the second pass being located downstream of the first pass, wherein the first pass of the exhaust outflow stream passageway passes through the sorbent wheel, then through the interchanger, and then through the hydrogen evaporator, and wherein the second pass of the exhaust outflow stream passageway passes through the hydrogen evaporator, then through the interchanger, and then through the sorbent wheel.

A electrochemical battery including: a battery module including one or more metal air cells which use oxygen gas as a positive electrode active material; an air supply configured to supply air to the battery module and to adjust an oxygen concentration in air supplied to the battery module; and a control unit configured to control an oxygen concentration adjusting operation of the air supply unit. Also a method of operating the electrochemical battery including: supplying air to a battery module using an air supply unit, the battery module including one or more metal air cells which use oxygen in air as a positive electrode active material; and controlling the air supply unit to adjust an oxygen concentration in the air supplied to the battery module.

The present disclosure provides a novel power-generating element that is advantageous from the maintenance-free point of view. A power-generating element according to the present disclosure includes a first electrode, a second electrode, and a solid electrolyte. The first electrode splits water. The solid electrolyte is placed between the first electrode and the second electrode. Ions generated by the splitting of the water at the first electrode are conducted toward the second electrode through the solid electrolyte. The splitting of the water at the first electrode and the generation of the ions in the solid electrolyte cause a potential difference between the first electrode and the second electrode, so that electrical energy is supplied to the outside of the power-generating element.

A ventilation apparatus includes: a controller that determines whether insulation resistance between a fuel cell stack and an enclosure including the fuel cell stack is equal to or smaller than a preset value, and varies a degree of opening of a valve provided between an inlet provided on one side of the enclosure and an air blower injecting air to an interior of the enclosure through the inlet based on the determination.