INFLUENCE OF METAL SUBSTITUTE ON ELECTROCHEMICAL AND SORPTION CHARACTERISTICS OF LaNi5 BASED ALLOYS

Shcherbakova, L. G.; Solonin, Yu. М.; Severyanina, Ye. N.

doi:10.1007/978-1-4020-8898-8_80

Cited by 4 publications

(6 citation statements)

References 4 publications

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“…Each layer was annealed in an air atmosphere at 535 °C for 30 minutes. According to literature, at this temperature, it is also possible to partially reduce graphene oxide by decarboxylation [10]. The results of the study of the PEC cell operation are given in Table 1.…”

Section: Methodsmentioning

confidence: 92%

The photoelectrochemical cell with hydrogen accumulation at the conditions of natural insolation

et al. 2018

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The film photoanodes based on CdSe and NT-TiO2/CdSe have been formed by the electrochemical and painting methods. It is shown that the introduction of graphene oxide into the structure of the semiconductor CdSe film promotes absorption of light and leads to improvement in their characteristics by 25-30 %. The compatibility of the cathode based on composite of hydrogen-sorbing intermetallic alloys LaNi4.5Mn0.5 + LaNi3.5Al0.7Mn0.8 with current-conductive additives in pair with the CdSe photoanode is shown. It was found that 95 – 98 % of the total current generated under the influence of sunlight at the anodes was used on the formation and accumulation of hydrogen by cathodes.

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Section: Methodsmentioning

confidence: 92%

The photoelectrochemical cell with hydrogen accumulation at the conditions of natural insolation

et al. 2018

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“…Partial replacement of Ni atoms in the intermetallic LaNi5 by Al or Mn atoms causes significant reduction of the equilibrium pressure in the plateau region, reducing the absorption/desorption pressure hysteresis with a slight decrease in the hydrogen capacity. The kinetics of sorption processes also does not change significantly, although the data on the kinetics are contradictory [5,[45][46][47][48].…”

Section: Sims Investigation Of the Lani5 Alloy Surface And A Number O...mentioning

confidence: 99%

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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“…A cast LaNi 4.5 Al 0.5 alloy is easily activated, has a high discharge capacity (above 300 mA h/g), and forms stable hydride [5,6]. For this reason, in the present work, we have investigated thoroughly the morphology, structure, and electrochemical characteristics of gas atomized LaNi 4.5 Al 0.5 alloy powders of different size.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle size and type of conductive additive on the electrode performances of gas atomized AB5-type hydrogen storage alloy

Shcherbakova¹,

Spodaryk²,

Solonin³

et al. 2013

International Journal of Hydrogen Energy

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INFLUENCE OF METAL SUBSTITUTE ON ELECTROCHEMICAL AND SORPTION CHARACTERISTICS OF LaNi5 BASED ALLOYS

Cited by 4 publications

References 4 publications

The photoelectrochemical cell with hydrogen accumulation at the conditions of natural insolation

The photoelectrochemical cell with hydrogen accumulation at the conditions of natural insolation

The Role of Surface in Hydride Formation Processes

Effects of particle size and type of conductive additive on the electrode performances of gas atomized AB5-type hydrogen storage alloy

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