The Improvement of Dehydriding the Kinetics of NaMgH3 Hydride via Doping with Carbon Nanomaterials

Abstract

NaMgH 3 perovskite hydride and NaMgH 3 -carbon nanomaterials (NH-CM) composites were prepared via the reactive ball-milling method. To investigate the catalytic effect of CM on the dehydriding kinetic properties of NaMgH 3 hydride, multiwall carbon nanotubes (MWCNTs) and graphene oxide (GO) were used as catalytic additives. It was found that dehydriding temperatures and activation energies (∆E 1 and ∆E 2 ) for two dehydrogenation steps of NaMgH 3 hydride can be greatly reduced with a 5 wt. % CM addition. The NH-2.5M-2.5G composite presents better dehydriding kinetics, a lower dehydriding temperature, and a higher hydrogen-desorbed amount (3.64 wt. %, 638 K). ∆E 1 and ∆E 2 can be reduced by about 67 kJ/mol and 30 kJ/mol, respectively. The results suggest that the combination of MWCNTs and GO is a better catalyst as compared to MWCNTs or GO alone.

CaXH 3 (X = Mn, Fe, Co) perovskite‐type hydrides for hydrogen storage applications

“…Some of the compounds of this structural group are CaCoH 3 , CaNiH 3 , LiTH 3 (T: Fe, Co, Ni, Cu), SrPdH 3 , and SrLiH 3 . ABH 3 perovskite‐type hydrides have been studied in recent years with regard to experimental and theoretical methods to get detailed information about their possible applications . The hydrogen storage techniques should satisfy some necessary conditions like suitable gravimetric and volumetric hydrogen storage capacities, reversibility, and good kinetics in order to get a suitable hydrogen storage material.…”

“…In literature, according to hydrogen stability in the structure and limited combinations of cations, the works have been developed on oxides than hydrides . However, the hydrides containing lightweight elements have received considerable attention with their high thermal stability and absorption/desorption capacity in the process of hydrogen storage . As an alternative material in use of hydrogen storage, this work presents structural, mechanical, electronic, and lattice dynamical characteristics of CaXH 3 compounds with different X elements.…”

“…[16][17][18][19] Among them, the perovskite-type hydrides have been promising candidate for solid-state type of future hydrogen storage materials. [20][21][22][23][24][25][26][27][28] There are numerous number of perovskite compounds that can be obtained as carbides, nitrides, fluorides, chlorides, bromides, oxides, hydrides, and iodides. 29,30 On the other hand, oxides and hydrides are the most prominent structures which may be applicable in the use of hydrogen storage.…”

“…26-28 ABH 3 perovskite-type hydrides have been studied in recent years with regard to experimental and theoretical methods to get detailed information about their possible applications. [9][10][11][12][20][21][22] The hydrogen storage techniques should satisfy some necessary conditions like suitable gravimetric and volumetric hydrogen storage capacities, reversibility, and good kinetics 31 in order to get a suitable hydrogen storage material. The above-mentioned various ABH 3 compounds were investigated for their hydrogen storage potentials thanks to their high gravimetric hydrogen storage capacities.…”

“…24 However, the hydrides containing lightweight elements have received considerable attention with their high thermal stability and absorption/desorption capacity in the process of hydrogen storage. [20][21][22][23][24][25][26][27][28] As an alternative material in use of hydrogen storage, this work presents structural, mechanical, electronic, and lattice dynamical characteristics of CaXH 3 compounds with different X elements. CaXH 3 is formed from divalent metal (Ca) and transition metal (X: Mn, Fe, and Co).…”