The controllable hydrolysis rate for LaMg12 hydride

In this work, the hydrogenation mechanism for LaMg12 alloy is revealed by introducing hydrogen step by step and the hydrogenation degree is found to affect the hydrolysis properties of LaMg12Hx hydrides. Because the hydrolysis performance of Mg is affected limitedly while MgH2 is accelerated significantly by LaH3, the hydrolysis rate is controllable through adjusting the ratio of LaH3 to MgH2. The synergistic effect of LaH3 and MgH2 leads to the complete hydrolysis of the fully hydrogenated LaMg12H27, yielding 9.73 wt. % (1089.55 ml g−1) hydrogen.

► The fully hydrogenated LaMg12H27 yields 9.73 wt.% hydrogen.
► The hydrogenation mechanism for LaMg12 alloy is revealed.
►  The hydrogenation degree affects the hydrolysis properties of LaMg12Hx hydrides.
► The hydrolysis performance of MgH2 is accelerated significantly by LaH3.
► The hydrolysis rate is controllable through adjusting the ratio of LaH3 to MgH2.