A fuel tank for storing a hydrogen liquid carrier and a spent hydrogen liquid carrier includes a substantially rigid exterior tank wall including a first chamber and a second chamber. The first chamber is fluidly disconnected from the second chamber, and the second chamber includes a dynamically expandable and contractible enclosure, the enclosure being configured to define a dynamic boundary between the hydrogen liquid carrier and spent hydrogen liquid carrier. The fuel tank also includes a first channel in flow communication with one of the first chamber or the second chamber and a second channel in flow communication with another of the first chamber or the second chamber, wherein the first channel and the second channel are flow connected such that a flow through one of the first or second channels is returned to the another of the first or second channels, and that during the flow, the dynamic boundary changes position causing a change in a volume of the second chamber.

A system includes a canister and a fuel cell. The canister defines an internal volume configured to have a hydride bed positioned therein. The canister includes at least 1.0 kWH/kg of energy based on a heating value of 120 kJ/g of hydrogen present. The hydride bed includes lithium aluminum hydride, aluminum hydride, or a combination thereof. The hydride bed is configured to release hydrogen gas when heated to a predetermined temperature. The fuel cell is configured to receive the hydrogen gas from the canister and to use the hydrogen gas as fuel to produce power for a load.

The disclosed technology generally relates to energy storage devices, and more particularly to redox batteries. In one aspect, a redox battery comprises a first half cell and a second half cell. The first half cell comprises a positive electrolyte reservoir comprising a first electrolyte contacting a positive electrode and has dissolved therein a first redox couple configured to undergo a first redox half reaction. The second half cell comprises a negative electrolyte reservoir comprising a second electrolyte contacting a negative electrode and has dissolved therein a second redox couple configured to undergo a second redox half reaction. The redox battery additionally comprises an ion exchange membrane separating the positive electrolyte reservoir and the negative electrolyte reservoir. The first half cell, the second half cell and the ion exchange membrane define a redox battery cell that is sealed in a casing.

A system for storing solid state hydrogen includes: a solid state hydrogen storage pellet including a magnetic material and storing solid state hydrogen therein; an inner container surrounding the solid state hydrogen storage pellet; and a coil surrounding the inner container, wherein when current is supplied to the coil, the current reacts with the magnetic material included in the solid state hydrogen storage pellet to form an induction magnetic field, thereby heating the solid state hydrogen storage pellet.

An illustrative example fuel cell reactant flow control valve assembly includes a pneumatic valve configured to allow reactant flow when the pneumatic valve is in an open condition and to prevent reactant flow when the pneumatic valve is in a closed condition. A control valve selectively allows a pressure of the reactant to provide pneumatic pressure to maintain the pneumatic valve in the open condition. The control valve selectively vents the pneumatic pressure reservoir to control a rate at which the pneumatic pressure decreases and a rate at which the pneumatic valve changes from the open condition to the closed condition.

A system for extracting hydrogen gas from a liquid hydrogen carrier may include a hydrogen gas reactor, a catalyst for facilitating extraction of the hydrogen gas from the liquid hydrogen carrier, and a reservoir for containing the liquid hydrogen carrier and a spend liquid hydrogen carrier. The system may be configured to regulate a flow of liquid hydrogen carrier in and out of the hydrogen gas reactor, to move a catalyst relative to a volume of the liquid hydrogen carrier, and to provide a continuous flow of the hydrogen gas, in response to a demand for the hydrogen gas.

Method and system for managing hydrogen fuel in hydrogen fuel cell-powered aircraft is disclosed. The method identifies unused hydrogen fuel in a fuel tank of the aircraft. Determines an amount of the unused hydrogen fuel in the fuel tank of the aircraft. Transfers the amount of the unused hydrogen fuel from the fuel tank of the aircraft into a hydrogen fuel cell of the aircraft and converts the amount of the unused hydrogen fuel into electricity via the hydrogen fuel cell of the aircraft.

A flow battery of the type comprising at least one stack of planar cells 17, at least one negative electrolyte tank 3, at least one positive electrolyte tank 4, at least two pumps 5 and 6, for supplying electrolytes to at least one stack of planar cells 17. Either or both of the first tank 3 and the second tank 4, a primary cabinet 19, an underground tanks container 20, having a thermal insulation 18 between said tanks container 20 and the tanks 3 and 4, at least one secondary heat exchanger 21, at least one primary heat exchanger 22, at least one coolant pump 23, wherein said container 20 is buried below ground level.

A system includes a canister and a fuel cell. The canister defines an internal volume configured to have a hydride bed positioned therein. The canister includes at least 1.0 kWH/kg of energy based on a heating value of 120 kJ/g of hydrogen present. The hydride bed includes lithium aluminum hydride, aluminum hydride, or a combination thereof. The hydride bed is configured to release hydrogen gas when heated to a predetermined temperature. The fuel cell is configured to receive the hydrogen gas from the canister and to use the hydrogen gas as fuel to produce power for a load.

A connector system (1) for coupling one fluid conduit to another fluid conduit comprises a first connector element (2) having a mating surface extending around an insertion axis of the connector element. The mating surface incorporates first and second resilient peripheral seals (7, 9) extending around the mating surface, the first and second peripheral seals (7, 9) having different diameters and being separated along the insertion axis. The first connector element (2) bearing the peripheral seals (7, 9) can be the female connector (2), such as shown, or can be the male connector (3).