Hydrogen generation from the ball milled composites of sodium and lithium borohydride (NaBH4/LiBH4) and magnesium hydroxide (Mg(OH)2) without and with the nanometric nickel (Ni) additive

► (NaBH4+2Mg(OH)2) starts dehydrogenating at 240 °C. ► (LiBH4+2Mg(OH)2) starts dehydrogenating at 200 °C. ► At 300 °C both composites desorb about 5 wt.% H2. ► The apparent activation energy for dehydrogenation is calculated. ► Nano Ni effect on dehydrogenation rate is negligible.