Microstructure and hydriding properties of ball-milled Mg–10at.%MmNi5 (Mm=La, Ce-rich mischmetal) composites

Electrochemical hydrogen insertion in Mg–La(Mm)Ni5 nanocomposites

“…The average crystal size of all phases present increases insignificantly as a result of the heat treatment to about 40-45 nm. Small amount of CeH x forms during cycling as well and appears to be stable during heating up to 300 • C. These results are in good agreement with those obtained recently by Delchev et al [18].…”

“…In our recent study [18] low temperature hydriding from a hydrogen gas phase was found for ball-milled Mg-10 at.% MmNi 5 nanocomposite and the hydrogen capacity was relatively high, ∼3.5 wt.% H 2 . Therefore, in our present work Mg-Mm(La)Ni 5 nanocomposites with different compositions were produced by high energy ball milling (BM) and their electrochemical hydriding/dehydriding was studied.…”

Hydrogen storage in Mg–10at.% LaNi5 nanocomposites, synthesized by ball milling at different conditions

“…The composites were synthesized by ball milling, using a custom built planetary ball mill [11]. The milling process was carried out for 10 h with 1 h of continuous milling, followed by 30 min relaxation.…”

“…For coarse-grained polycrystalline MgH 2 it could take as long as several hours to decompose at 300-350 • C. Size reduction gives better results [3,4], but is often not sufficient and comes with the cost of sacrificing capacity for kinetics. Therefore research on catalyst additions [5][6][7], composites [8][9][10][11][12] and alloys [13,14] based on Mg (especially synthesized by reactive ball milling) has been intensively carried out. In our recent study [15] it was shown that in addition to the grain size, the particle reduction (to less than 1 m) improves the hydrogen sorption kinetics of nanocrystalline Mg/MgH 2 powders.…”

Mechanical alloys Mg-Me (Me: Ti, Fe, Ni, Al) & Mg-Me1-Me2(Ме1:Al, Me2: Ti, Fe, Ni) with low resistance and improved kinetics of hydrogenation/dehydrogenation for hydrogen storage applications

“…These shortcomings authors try to solve by commercial MgH2 mechanical dispersion in the presence of various kinds of catalytic additives: transition 3d-, 4d-metals [1][2][3][4][5][6][7][8][9][10][11] and their oxides [12][13][14][15][16][17][18][19][20][21][22][23][24], fluorides [25], intermetallic compounds and additives of Al, Cu, Zn, In, Sn nontransition metals, graphite and others [26][27][28][29][30][31][32][33][34][35][36][37][38].…”