HYDROGEN SORPTION PROPERTIES OF INTERMETALLIC COMPOUNDS La3-xMgxNi9

Son, V. B.; Шимкус, Ю. Я.; Тарасов, Б. П.; Denis, R. V.; Яртысъ, В А

doi:10.15518/isjaee.2015.21.011

Cited by 2 publications

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“…This method of storage can be implemented at relatively low temperatures and pressures, which provides a high degree of fire and explosion safety, without the use of cryogenic technology and expensive and highly insulated containers, which are necessary to minimize the losses caused by liquid hydrogen evaporation. Furthermore, the method is characterized by compactness and low energy costs for the hydrides formation as compared to the liquefaction and compression of hydrogen [6].…”

Section: Accumulation Compact and Safe Storage And Transportation Of ...mentioning

confidence: 99%

“…The reaction is reversible, the process can be turned to one direction or the other and its speed can be controlled by changing only the temperature and (or) pressure. An increase in the pressure of gaseous hydrogen and a decrease in temperature shift the equilibrium of the reaction to the side of hydride formation, while a decrease in pressure and an increase in temperature cause decomposition of the hydride [5,6].…”

Section: Introductionmentioning

confidence: 99%

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The Role of Surface in Hydride Formation Processes

Litvinov,

Okseniuk,

Shevchenko

et al. 2023

East Eur. J. Phys.

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Several LaNi5-based hydrogen storage alloys were studied using secondary ion mass spectrometry (SIMS) technique. Ar+ ions with the energy of 10 - 18 keV were used as primary ions. The study of the initial stages of the processes of LaNi5-based alloys interaction with hydrogen under the experimental conditions showed that on the areas of clean surface, hydrogen formed chemical compounds with the both of the main components of the alloy: nickel and lanthanum. As hydrogen accumulates on the surface and in the near-surface region, a hydrogen-containing structure is formed, which is characterized by a certain stoichiometric ratio of components. Nickel in this structure has strong chemical bonds with two hydrogen atoms, and lanthanum – with two or more hydrogen atoms. Along with such compounds, some structures with lower hydrogen content are also formed. The formed hydrogen-containing structure includes both main alloy components, La and Ni for all the studied samples, even though only lanthanum is generally accepted to be the hydride-forming element in such alloys. The SIMS studies of the chemical composition of the surface monolayers of the intermetallic alloy LaNi5, in the process of its interaction with oxygen, showed the following. As a result of the oxygen interaction with the alloy, a complex chemical structure including oxygen, lanthanum and nickel is formed on the surface and in the near-surface region of LaNi5. Oxygen in such a structure, similarly to hydrogen, forms strong chemical bonds with both components of the alloy. This is indicated by the presence in the mass spectra of a large set of oxygen-containing emissions of positive and negative secondary ions with lanthanum and nickel, as well as oxygen-containing lanthanum-nickel cluster secondary ions. The formed oxide compounds have a three-dimensional structure and occupy tens of monolayers. Oxygen poisoning of the surface of the hydride-forming alloy LaNi5 can occur regardless of whether the surface of the alloy was clean from the very beginning or it was covered with a layer of hydrogen-containing chemical compounds.

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Section: Accumulation Compact and Safe Storage And Transportation Of ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%