Remarkable hydrogen desorption properties and mechanisms of the Mg₂FeH₆@MgH₂ core–shell nanostructure

Abstract

Mg2FeH6@MgH2 dual-metal hydride with core-shell nanostructure starts to release hydrogen at 220 ºC with fast hydrogen desorption kinetics.

Synthesis, characterization and DFT studies of zinc-doped copper oxide nanocrystals for gas sensing applications

“…Hydrogen is widely used in industries, as a power source in aerospace, for metal sintering and annealing, in research laboratories, biomedical systems, automotive and transportation equipment, etc. [1][2][3][4][5][6][7][8] Therefore, the reliable, selective and fast detection of hydrogen gas leaks appears to be the strict necessity for preventing the accumulation of hydrogen in air (4% H 2 ). 6 In this context nano-and microstructures of p-type materials and especially the n-type semiconducting oxides have been intensively investigated over the past few decades due to their remarkable gas sensing properties, and importance for fundamental research and applied technologies.…”

The hydrogen storage properties of MgH2–Fe7S8 composites

“…Some weak peaks corresponding to MgO is found in the whole stage, which is ascribed to the oxidation of Mg in the test operation process. The existing equation in hydrogen release stage is in the following: 35 that the Mg 2 FeH 6 @MgH 2 core-shell sample has exhibited faster hydrogen desorption kinetics, which releases more than 5.0 wt.% H 2 within 50 min at 280 o C. Additionally, apart from Mg 2 FeH 6 -MgH 2 system, Mg 2 FeH 6 combined with NaBH 4 36 composite has boosted the dehydrogenation properties, while the dehydriding temperature of NaBH 4 is reduced by at least 150 K when combining with Mg 2 FeH 6 . The enhancement of the dehydriding property of LiBH 4 was also confirmed by Li et al 37 Mg 2 FeH 6 is a hydrogen-storage materials, which has the excellent ability for hydrogen uptake/release performance.…”

Extremely Pure Mg2FeH6 as a Negative Electrode for Lithium Batteries

“…In some cases, additional steps consisting of a hot extrusion process [6] or severe plastic deformation by ECAP (Equal Channel Angular Pressing) [7] were proposed. Quite recently, a solid state ball milling process followed by an additional wet ball milling process was exploited as a synthetic route [8]: the obtained samples consisted of a core of Mg 2 FeH 6 (with a diameter of 40-60 nm) encapsulated within an outer shell of MgH 2 (5 nm thick), with superior dehydrogenation properties (~5.0 mass % H 2 released within 50 min at 280 • C).…”