Effectively enhanced hydrogen storage properties of Mg90Al10 catalyzed by CeF3

Magnesium-based hydrogen storage alloy serves as an ideal substance for hydrogen storage and transportation because of its high hydrogen storage capacity, low expense, and eco-friendly properties. However, the stable thermodynamic properties and poor kinetic properties during de/hydrogenation limit its application. In this work, a novel high-efficiency catalyst CeF 3 was successfully synthesized and induced into Mg 90 Al 10 , which exhibited excellent performance during de/hydrogenation. In particular, the Mg 90 Al 10  + 8 wt% CeF 3 can absorb 4.0 wt% hydrogen within 600 s at 200 °C, and release 4.3 wt% hydrogen within 900 s at 275 °C, better than the Mg 90 Al 10 that can only absorb 1.36 wt% and release 0.3 wt% hydrogen in similar conditions. Meanwhile, the introduction of CeF 3 can also decrease the dehydrogenation apparent activation energy (E a ) of Mg 90 Al 10 obviously from 155.95 kJ/mol to 79.31 kJ/mol. The Al 4 Ce and MgF 2 formed in situ, combined with the high thermal conductivity of Al in charge of the good hydrogen storage behavior of Mg 90 Al 10  + 8 wt% CeF 3 . The study results are of great importance for applying Mg-Al hydrides in solid-state hydrogen storage.