Enhanced hydrogenation and hydrolysis properties of core-shell structured Mg-MOx (M = Al, Ti and Fe) nanocomposites prepared by arc plasma method

Nanostructured Mg for hydrogen production by hydrolysis obtained by MgH2 milling and dehydriding

“…In the second case, the higher yield can be linked with the microstructure and with the use of a solution with the acidic Al 3+ cation. The other results reported in the literature for MgH2 without additives have either lower yield or slower kinetics [8,13,15,[31][32][33][34]. In some cases, the differences could be due to the solution concentration [8,13], the solution type [15], or the use of distilled water [31][32][33][34].…”

“…The utilization of salt solutions, in particular chlorides solutions, has beneficial effects caused by Clanions that strongly induce pitting corrosion [3,10,11]. A vast majority of papers reporting hydrogen production by hydrolysis use these solutions in the experiments [8,9,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] or hydrolyze a mixture of Mg or MgH2 with a chloride salt prepared by mechanical milling [28][29][30][31]. Among the different chloride solutions those with Mg 2+ and those with acidic cations like Zr 4+ , Fe 3+ and Ti 3+ stand out for being more active [3,31].…”

“…On the contrary, the ductility of Mg favors the cold welding process during milling and makes difficult to reduce Mg particles size and to increase the specific surface area [15]. This disadvantage can be partially avoided by the use of process-control agents such as graphite or carbon nanotubes during milling [21], but generally better results are achieved by milling MgH2 than Mg. Other options to obtain nanostructured materials are plasmametal reaction using Mg [9,13,14] or Mg + metal oxide [13]. The first has been used to produce a nanometric Mg [9] that exhibits a high total hydrogen production capacity of 910 mL/g, with fast kinetics (50% of reaction completion in just 0.4 min).…”

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

“…However, its practical application is limited due to its thermodynamic stability and poor kinetic performance. To overcome these weaknesses, methods such as alloying (Oh et al, 2016;Hardian et al, 2018;Li et al, 2018), nanocrystallization (Wagemans et al, 2005;Li et al, 2007) and the addition of catalysts has been employed (Cui et al, 2014;Huang et al, 2017;Zhang et al, 2017;Wang et al, 2019;Yang et al, 2019).…”

First-Principles Study on Hydrogen Storage Performance of Transition Metal-Doped Zeolite Template Carbon

“…Due to the great specific surface area and exceedingly uniform microporous structure, the zeolites template carbon (ZTC) nanostructures could render high capacity for absorbing hydrogen [11,12]. Furthermore, the intrinsic cation distribution in zeolites makes it feasible to improve hydrogen storage capability by decorating metal atoms in ZTC, to meet the technical requirements of safe and reliable hydrogen storage with small volume, lightweight, low cost and low density [13,14]. Recently, the density functional (DFT) study on hydrogen storage of lithium modified ZTC has been reported in high interest, in which the lithium atoms are utilized to modify the convex surface of ZTC carbon nanostructures so that this doping structure can be efficiently used as a hydrogen storage medium [15].…”