The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

To provide a hydrogen storage unit that can heat a storage container including hydrogen absorbing alloy with favorable thermal efficiency, and a fuel cell system provided with the hydrogen storage unit. The cell body of the fuel cell is provided with a fuel cell stack configured to react hydrogen and oxygen to generate electricity, and a stack cooling passage configured to cool the fuel cell stack by circulation of a heat medium. The hydrogen storage unit of the hydrogen supply unit of the fuel cell is provided with: a housing; a plurality of cylinders that are housed in the housing and include hydrogen absorbing alloy; and a temperature control member having a heat medium flowing through the temperature control member so as to heat or cool the cylinder.

A hydrogen compression system includes: a heat pump part including a heat pump line configured to allow a refrigerant to circulate therethrough, a hydrogen compression part configured to compress hydrogen by being repeatedly heated and cooled, a first circulation line connected to the heat pump line while passing through the hydrogen compression part and configured to allow the refrigerant introduced from the heat pump line to circulate therethrough, a second circulation line provided to pass through the hydrogen compression part and configured to allow a cooling fluid to circulate therethrough, and a cooling unit provided in the second circulation line and configured to cool the cooling fluid, in which the hydrogen compression part is heated by the refrigerant or cooled by the cooling fluid, thereby minimizing electric power consumption and improving energy efficiency.

A hydride heat engine produces electricity from a heat source, such as a solar heater. A plurality of metal hydride reservoirs are heated by the heating device and a working fluid comprises hydrogen is incrementally move from one metal hydride reservoir to a success metal hydride reservoir. The working fluid is passed, at a high pressure, from the last of the plurality of metal hydride reservoirs to an electro-chemical-expander. The electro-chemical-expander has an anode, a cathode, and an ionomer therebetween. The hydrogen is passed from the anode at high pressure to the cathode at lower pressure and electricity is generated. The solar heater may be a solar water heater and the hot water may heat the metal hydride reservoirs to move the hydrogen. The working fluid may move in a closed loop.

A method for recovering hydrogen which is capable of efficiently recovering high concentration hydrogen gas by adsorbing and removing hydrocarbon gas such as carbon dioxide from biomass pyrolysis gas under a relatively low pressure, and also capable of storing the recovered high concentration hydrogen gas, preferably, in a cartridge type container that can be used as is as a hydrogen storing container for an apparatus equipped with a fuel cell. The method includes a first purifying stare of purifying biomass pyrolysis gas and a second purifying stage of purifying the obtained purified gas under a pressure equal to or less than the pressure in the first purifying stage to recover gas that contains hydrogen, and further includes a hydrogen storing stage of feeding the gas containing hydrogen recovered in the second purifying stage into the container filled with a hydrogen storage alloy and storing high purity hydrogen.

A palladium hydride nanomaterial includes nanostructures having a chemical composition represented by the formula: M.sub.y-Pd.sub.xH.sub.z, where M is at least one metal different from palladium; x has a non-zero value in the range of 0 to 5; y has a value in the range of 0 to 5; and z has a non-zero value in the range of 0 to 5.

A method for making a metal-hydride slurry includes adding metal to a liquid carrier to create a metal slurry and hydriding the metal in the metal slurry to create a metal-hydride slurry. In some embodiments, a metal hydride is added to the liquid carrier of the metal slurry prior to hydriding the metal. The metal can be magnesium and the metal hydride can be magnesium hydride.

A hydrogen storage and release arrangement comprising a vessel having a first end, a second end and an interior volume. The arrangement includes a first set of tubes extending into the interior volume from the first end of the vessel. Tubes of the first set of tubes each comprise a metal hydride. The arrangement further includes a second set of tubes, where tubes of the second set of tubes each include a metal hydride. The metal hydride of the first set of tubes and the metal hydride of the second set of tubes are arranged to absorb and desorb hydrogen gas in response to temperature changes caused by heat exchange fluid. The second set of tubes extends into the interior volume from the second end of the vessel. The embodiments herein also relate to use of a hydrogen storage and release arrangement and a method for storing and releasing hydrogen.

An object of the present invention is to enable filling a hydrogen storage alloy uniformly and easily at the time of filling the hydrogen storage alloy. The invention relates to a method for filling a hydrogen storage alloy including, when the hydrogen storage alloy that has been made as a resin composite material by mixing hydrogen storage alloy particles or powder with a resin and carbon fiber is filled into a tank, vibrating the tank at a predetermined frequency to adjust a filling ratio of the hydrogen storage alloy in the tank.

A hydrogen storage and release arrangement comprising a vessel having a first end, a second end and an interior volume. The arrangement includes a first set of tubes extending into the interior volume from the first end of the vessel. Tubes of the first set of tubes each comprise a metal hydride. The arrangement further includes a second set of tubes, where tubes of the second set of tubes each include a metal hydride. The metal hydride of the first set of tubes and the metal hydride of the second set of tubes are arranged to absorb and desorb hydrogen gas in response to temperature changes caused by heat exchange fluid. The second set of tubes extends into the interior volume from the second end of the vessel. The embodiments herein also relate to use of a hydrogen storage and release arrangement and a method for storing and releasing hydrogen.