Hydrogen storage alloy powder, an anode, and a nickel-hydrogen rechargeable battery are provided, which are excellent in low-temperature characteristics and both in initial activity and cycle life at the same time, which properties are trading-off in conventional nickel-hydrogen rechargeable batteries. The alloy powder has a composition represented by formula (1) R.sub.1-aMg.sub.aNi.sub.bAl.sub.cM.sub.d (R: rare earth elements including Sc and Y, or the like; 0.005a0.40, 3.00b4.50, 0c0.50, 0d1.00, 3.00b+c+d4.50), and has an arithmetical mean roughness (Ra) of the powder particle outer surface of not less than 2 m, or a crushing strength of not higher than 35,000 gf/mm.sup.2.

A hydrogen storage alloy suitable for a negative electrode of an alkaline storage battery is provided. The hydrogen storage alloy provided is a hydrogen storage alloy used for an alkaline storage battery that has, as a main phase, one or two crystal structures selected from an A.sub.2B.sub.7-type structure and an AB.sub.3-type structure, and that is represented by a general formula: (La.sub.1abCe.sub.aSm.sub.b).sub.1cMg.sub.cNi.sub.dAl.sub.eCr.sub.f (where suffixes a, b, c, d, e, and f in this formula (1) meet the following conditions: 0<a0.15; 0b0.15; 0.17c0.32; 0.02e0.10; 0f0.05; and 2.95d+e+f3.50.

This hydrogen storage alloy has a composition represented by a general formula Ti.sub.1Fe.sub.xMn.sub.yNb.sub.z (0.804<x0.941, 0.033y0.136, 0<z0.081).

The present disclosure provides a magnesium-based composite material and a method of forming the same. The method includes performing a casting process on magnesium, at least one first catalytic metal, and at least one first carbon allotrope to form a first magnesium-based solid solution; performing a severe plastic deformation on the first magnesium-based solid solution to form a second magnesium-based solid solution; and performing a high energy ball milling process on the second magnesium-based solid solution and an amorphous additive to form the magnesium-based composite material. The magnesium-based composite material includes a magnesium-based solid solution and the amorphous additive mixed with the magnesium-based solid solution. The magnesium-based solid solution includes magnesium, at least one first catalytic metal and at least one first carbon allotrope. The amorphous additive includes at least one second catalytic metal and at least one second carbon allotrope.

A hydrogen absorbing alloy suitable for a negative electrode of an alkaline storage battery is used for an alkaline storage battery, and this hydrogen absorbing alloy is an alloy that is composed mainly of crystal phases of an A.sub.5B.sub.19 phase and an A.sub.2B.sub.7 phase and is represented by the following General Formula (A):

(La.sub.1-a-bCe.sub.aSm.sub.b).sub.1-cMg.sub.cNi.sub.dM.sub.eT.sub.f(A),

where M, T, and suffixes a, b, c, d, e, and f in Formula (A) meet the following conditions: M: at least one element selected from Al, Zn, Sn, and Si; T: at least one element selected from Cr, Mo, and V; 0<a0.10; 0b<0.15; 0.08c0.24; 0.03e0.14; 0f0.05; and 3.55d+e+f3.80.

A method of supplying heat includes: providing a heat generating material including: a first metal having a melting point of 230 C. or more, and a second metal having a melting point higher than the melting point of the first metal; and heating the heat generating material in the presence of hydrogen gas to a temperature that is equal to or more than a melting point of the first metal, thereby causing the heat generating material to generate excess heat.

Provided is a novel hydrogen-resistant member for hydrogen equipment, which has excellent hydrogen embrittlement resistance and tensile strength. A hydrogen-resistant member for hydrogen equipment, the member being made of an aluminum-copper alloy containing Cu as a base material and Al in a second largest amount after Cu. The hydrogen-resistant member has excellent hydrogen embrittlement resistance and tensile strength and can be suitably used, for example, as a hydrogen-resistant member for hydrogen equipment, such as a container, a heat exchanger, a pipe, a valve, a seal portion, and a strainer, that is used in a state of contact with hydrogen.

The present disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys capable of absorbing and releasing hydrogen. In preferred embodiments the disclosure relates to TiMn-based or TiCrMn-based hydrogen storage alloys comprising ferrovanadium (VFe).

A catalyst used for dehydrogenation of an organic hydrogen-storage material to generate hydrogen, a support for the catalyst, and a preparation process thereof are presented. A hydrogen-storage alloy and a preparation process thereof are provided. A process for providing high-purity hydrogen, a high-efficiently distributed process for producing high-purity and high-pressure hydrogen, a system for providing high-purity and high-pressure hydrogen, a mobile hydrogen supply system, and a distributed hydrogen supply apparatus are also described.

A catalyst used for dehydrogenation of an organic hydrogen-storage material to generate hydrogen, a support for the catalyst, and a preparation process thereof are presented. A hydrogen-storage alloy and a preparation process thereof are provided. A process for providing high-purity hydrogen, a high-efficiently distributed process for producing high-purity and high-pressure hydrogen, a system for providing high-purity and high-pressure hydrogen, a mobile hydrogen supply system, and a distributed hydrogen supply apparatus are also described.