This disclosure provides a hydrogen storing alloy and a production method thereof. The hydrogen storing alloy has a chemical composition of a general formula R.sub.(1-x)Mg.sub.xNi.sub.y, wherein R is one or more elements selected from rare earth elements comprising Y, x satisfies 0.05x0.3, and y satisfies 2.8y3.8. The ratio of the maximal peak intensity present in a range of 2=31-33 to the maximal peak intensity present in a range of 2=41-44 is 0.1 or less (including 0), as measured by X-ray diffraction in which a CuK ray is set as an X-ray source.

A heat generating cell includes: a support having tubular shape; and a multilayer film formed on an inner peripheral surface of the support for generating heat by occlusion and discharge of hydrogen. A heat generating device includes: a plurality of the heat generating cells; a sealed container; a plurality of separators dividing an inside of the sealed container into a first space, a second space, and a third space in an axial direction of the sealed container, the first space and the second space being locating at both ends in the axial direction in the sealed container; and a heater for heating each of the plurality of heat generating cells. The plurality of heat generating cells penetrate through the plurality of separators, and both ends of each of the plurality of heat generating cells in an axial direction are respectively opened to the first space and the second space.

A gas-loading and packaging system is provided for loading a material used in a hydrogen fuel cell with gas and packaging the material in a sealed container. The gas may comprise a hydrogen gas or other gas. The material may, for example, comprise zeolite. The material is loaded with gas by exposing the material to the gas under high pressure and a cryogenic temperature of about 93 Kelvin or lower. When the material is exposed to gas under pressure and at cryogenic temperature, the gas absorbs into or adsorbs onto the material. The mass of the material is continuously monitored and used to determine when the material is loaded with the desired amount of gas. After the material is loaded with gas, high pressure and cryogenic temperature is maintained while the material is packaged and sealed in a cryogenically cooled container.

Provided are a CaMg.sub.2-based alloy hydride material for hydrolysis production of hydrogen, a preparation method therefor and a use thereof. The material has a general formula of CaMg.sub.xM.sub.yH.sub.z, wherein M is Ni, Co or Fe, 1.5x<2.0, 0<y0.5, and 3z<6. The preparation method for the material comprises the following steps: (1) stacking three pure metal block materials in a crucible, wherein a metal block material M is placed at the top; (2) installing the crucible in a high-frequency induction melting furnace, evacuating and introducing an argon gas; (3) starting the high-frequency induction melting furnace to heat at a low power first, then increasing the power to uniformly fuse same; and thereafter cooling with the furnace to obtain an alloy ingot, and hammer-milling to obtain a hydrogen storage alloy based on CaMg.sub.2; and (4) hydrogenating the hammer-milled hydrogen storage alloy to obtain the material for hydrolysis production of hydrogen. The preparation method is simple and low in cost. The material can absorb hydrogen at normal temperature with a good hydrogen absorption performance. The prepared hydrogen is pure, and can be directly introduced into and used in a hydrogen fuel battery.

To provide a heat pipe where the heat pipe has an excellent capacity for absorbing a non-condensable gas such as a hydrogen gas thus exhibiting excellent heat transfer characteristics.

The heat pipe includes: a container having a cavity portion inside the container; a wick structure disposed in the cavity portion; a working fluid sealed in the cavity portion; and a metal which absorbs hydrogen at 350 C. or below and releases no hydrogen at 350 C. or below, the metal being disposed in the cavity portion.

A storage system for storing solid hydrogen includes: a plurality of storages including two or more types of solid hydrogen storage materials having different magnetic intensities; a storage container configured to accommodate the storages; and a coil disposed inside the storage container and configured to apply a variable magnetic field to the storages accommodated in the storage container.

A hydrogen storage device is described. The hydrogen storage device comprises a heater/cooler module (6) and a pressure containment vessel (1) defining an interior volume and having within it: a thermally conducting network (4) having a face in thermal contact with the heater/cooler module (6), the shape of the thermally conducting network (4) being a fractal geometry in two or three dimensions; optionally a metal foam in thermal contact with the thermally conducting network (4); and a hydrogen storage material (5) in thermal contact with the thermally conducting network (4).

A tank configured to reversibly store hydrogen, including: a plurality of cylindrically shaped casings each containing hydrides and each configured to be filled or emptied by the hydrogen being respectively absorbed or desorbed by the hydrides; a solid part made from thermally insulating material and having a low heat capacity being penetrated, within, by a plurality of cylindrically-shaped slots, the diameter of each of which is greater than that of a casing; a tank in which the casing is housed individually in a slot leaving an annular volume free between same such that to be traversed by a heat transfer fluid, following a defined circuit in each annular volume from an inlet common to all the annular volumes to an outlet which is also common.

A regenerative fuel cell produces hydrogen that is stored in a reservoir on the storage side of a membrane electrode assembly when operating in a hydrogen pumping mode and this stored hydrogen is reacted and moved back through the membrane electrode assembly to form water when operating in a fuel cell mode. A metal hydride forming alloy may be configured in the hydrogen storage reservoir and may be coupled to the membrane electrode assembly. An integral metal hydride electrode having a metal hydride forming alloy may be configured on the storage side of the membrane electrode assembly and may have a catalyst or an ion conductive media incorporated therewith.

The present disclosure relates to a composition that includes a solid core having an outer surface and a coating layer, where the coating layer covers at least a portion of the outer surface, the coating layer is permeable to hydrogen (H.sub.2), and the solid core is capable of reversibly absorbing and desorbing hydrogen.