NOVELTY - Process for forming hydrogen storage material comprises: providing first material of metal borohydride complex compound (I); providing second material comprising metal aluminum hydride complex compound (II) or their mixture, metal chloride compound (III) or their mixture and aluminum, or aluminum hydrides, and mixture of metal hydrides (IV) and aluminum or aluminum hydrides; and combining first and second materials at elevated temperature and hydrogen pressure to form a third material having lower hydrogen release temperature than the first material.    USE - The process is useful to form hydrogen storage material (claimed), which is useful to release hydrogen useful as alternative fuel.    ADVANTAGE - The third material: has a higher hydrogen gravimetric density than the second material; and reversibly stores hydrogen; and has lower hydrogen release temperature than the first material. The third material, when rehydrided, then it reversibly releases at least 6 wt.% hydrogen. (I) has improved thermodynamic properties. The third material have a lower hydrogen desorption temperature and faster desorption kinetics compared to the initial metal borohydride materials.    DETAILED DESCRIPTION - Process for forming hydrogen storage material comprises: providing first material of metal borohydride complex compound of formula (M(BH4)x) (I); providing second material comprising metal aluminum hydride complex compound of formula (M(AlH4)x) (II) or their mixture, metal chloride compound of formula (M(Cl)y) (III) or their mixture and aluminum, or aluminum hydrides, and mixture of metal hydride compounds of formula (M(H)x) (IV) and aluminum or aluminum hydrides; and combining first and second materials at elevated temperature and hydrogen pressure to form a third material having lower hydrogen release temperature than the first material.    M = alkali metal or alkaline earth metal (preferably magnesium, calcium, strontium, barium and/or aluminum);    x = 1-2; and    y = 1-4.