The invention provides a preparation method of a gasification
slag magnesium-
nickel alloy hydrogen storage
composite material. The method is characterized in that after
magnesium powder,
nickel powderand gasification
slag are mixed, by means of a porous structure of the gasification
slag, pore channels of the gasification slag are filled with the
magnesium powder and the
nickel powder through ball milling,
ultrasonic vibration and other
modes, and a mixture is uniformly mixed; and then through pressing,
sintering and cooling, the gasification slag magnesium-
nickel alloy hydrogen storage
composite material is prepared. When the
composite material is used for
hydrogen storage, the porous gasification slag serving as a catalyst is distributed in a magnesium-
nickel alloy matrix, so that alloyhydrogenation and
hydride dehydrogenation can be promoted,
alloy hydrogen collection and
hydrogen desorption speed can be increased, and the
activation energy of a
hydrogen storage system can be reduced; and fine magnesium-
nickel alloy particles are distributed in the gasification slag pore channels, so that the growth, caused by heating in a
hydrogen desorption process, of the magnesium-nickel
alloy particles can be effectively inhibited, and then the
hydrogen storage cycle stability of the composite material is maintained. The preparation method is low in cost and wide in
raw material source, has the effects of
solid waste gasification slag treatment, and reclamation and higher value application of the gasification slag at the same time, and is remarkable in
advantage and suitable for popularization.