Increased performance of hydrogen storage by Pd-treated LaNi4.7Al0.3, CaNi5 and Mg2Ni

Improved durability of hydrogen storage alloys

“…As stated above, in prior work, a palladium treatment was demonstrated for three intermetallic alloys: LaNi 4.7 Al 0.3 , CaNi 5 and Mg 2 Ni [5]. The treatment lowered the activation pressure to sub-atmospheric pressure at room temperature and also significantly increased the absorption and desorption rates.…”

“…Three intermetallic alloys, LaNi 4.7 Al 0.3 , CaNi 5 and Mg 2 Ni, were selected as hydrogen storage candidates for a microfabricated proton exchange membrane (PEM) fuel cell developed at Case Western Reserve University. The selection was based upon plateau pressures and hydrogen capacity per unit volume.…”

“…In order to meet the design specification for an on-board hydrogen storage module, an activation treatment was developed and validated [5,6]. Mechanical grinding of a small amount of palladium or platinum with the hydrogen storage alloys was shown to greatly improve their hydrogen absorption and desorption performances [5].…”

“…Mechanical grinding of a small amount of palladium or platinum with the hydrogen storage alloys was shown to greatly improve their hydrogen absorption and desorption performances [5].…”

“…The hydrogen absorption and desorption rates of the palladium treated hydrogen storage alloys increased with the palladium concentration. With 10 wt.% palladium, the absorption rates of the treated alloys could be hundreds of time faster compared to the samples without palladium treatment [5]. To be effective for on board use with micro-power system, the hydrogen storage materials needs to be remain active for long time.…”