| 摘要 |
Disclosed is a very light-weight, Mg-based material which has the ability to reversibly store hydrogen with very good kinetics. This material is of the formula (Mg1-x A x) D y wherein A is an element selected from the group consisting of Li, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Y, Zr, Nb, Mo, In, Sn, O, Si, B, C and F; D is a metal selected from the group consisting of Fe, Co, Ni, Ru, Rh, Pd, Ir and Pt (preferably Pd); x is a number ranging from 0 to 0.3; and y is a number ranging from 0 to 0.15. This material is in the form of a powder of particles of the formula Mg1-x A x as defined hereinabove, having an average size ranging from 0.1 to 100 .mu.m, each particle consisting of nanocrystalline grains having an average size of 3 to 100 nm or having a nan o- layered structure with a layer spacing of 3 to 100 nm. Some of these particles have clusters of metal D attached thereto, with an averag e size ranging from 2 to 200 nm. Also disclosed are a process for preparing this material which has a very high hydrogen absorption capacity, and a method of use of the same for the transpartition and/or storage of hydrogen and/or the storage of thermal energy.
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