New Metal-Hydride Materials Based on R2–x Mg x Ni4 Alloys for Chemical Current Sources

Verbovyts’kyi, Yu. V.; Zavalii, І. Yu.

doi:10.1007/s11003-017-0018-6

Cited by 19 publications

(6 citation statements)

References 38 publications

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“…Since Oesterreicher et al first studied the LaMgNi 4 compound with the MgCu 2 /SnMgCu 4 structure type, many studies have been performed on the hydrogenation properties of the R MgNi 4 compounds (preferably with R being a light rare-earth element). ,, Our group has systematically investigated R MgNi 4- x Co x compounds for R = Ce, Y, Nd, La, and Pr, where a 50% increase of the hydrogen capacity was found upon Co for Ni substitution.…”

Section: Introductionmentioning

confidence: 99%

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

et al. 2019

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Series of cubicTbMgNi 4-x Сo x (x = 0-4) pseudo binary compounds have been synthesized either by solid state reaction or mechanical alloying with further annealing treatment. Their hydrogenation properties have been studied by Pressure-Composition-Temperature (PCT) measurements, showing the formation of α-, βand γ-hydrides. The Co for Ni substitution yields a lowering of the equilibrium pressure and an increase of hydrogen capacity. An improvement of the kinetic of hydrogen absorption was observed for increasing Co content. The β-TbMgNi 4-x Сo x H 4 (x = 0-3) hydrides show an orthorhombic distortion (Pmn2 1 space group) whereas β-TbMgСo 4 H 3.3 hydride crystallizes in a monoclinic structure (Pm space group) derived from the orthorhombic structure. Sensitivity of the formation of the β-TbMgСo 4 H 3.3 hydride to the temperature has been observed in PCT curves: it exists below 50 °C. γ-TbMgNi 4-x Сo x H y (x = 2-4, y > 5) hydrides preserve the parent cubic structure (F-43m space group) with an hydrogen induced volume expansion of 17.9-22.3 %. The deuterium for hydrogen substitution in TbMgNiCo 3 -(H,D) 2 system prevents fast desorption at room temperature and ambient pressure The positions of deuterium atoms in the γ-TbMgCo 4 D 6 deuteride were determined by neutron powder diffraction. Two types of interstitial sites were found occupied: 87 % of deuterium atoms (D1 site) are located inside Tb 2 MgCo 2 octahedra and the remaining 13 % (D2 site) are inside Co 4 tetrahedra. The increase of Co content allows to improve the thermodynamic stability of TbMgNi 4-x Сo x hydrides as demonstrated by the lowering of the desorption plateau pressure, the increase of the desorption temperature and of the enthalpy of formation versus Co content. This last experimental result is confirmed by first principles calculations where electronic structures of intermetallic compounds and their cubic TbMgNi 4x Сo x H 6 hydrides are compared for x = 0, 2 and 4.

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Section: Introductionmentioning

confidence: 99%

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

et al. 2019

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“…Сплави La-Mg-Ni вже давно зарекомендували себе як практично значущі воденьсорбційні матеріали, які знайшли широке застосування для виготовлення акумуляторів водню та електродів металогідридних батарей [1][2]. Як відомо, легування є одним із методів поліпшення експлуатаційних характеристик [3].…”

Section: вступunclassified

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Verbovytskyy¹,

Zavaliy²,

Lyutyy³

et al. 2021

Proc. Shevchenko Sci. Soc. Chem. Sci.

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Co, Fe, Mn) alloys were synthesized by the sintering method and characterized by X-ray powder diffraction method. All phases belong to the SnMgCu 4 structural type (space group F-43m). Rare earth metal atoms occupy the position of Mg atoms (4a), Mg atoms are located in the Sn sites (4c), and transition metal atoms distribute the Cu positions (16e). Three selected alloys were hydrogenated. The alloys easily absorb hydrogen at room temperature and maximum pressure up to 10 bar. One orthorhombic YMgNi 3 FeH 4.2 (structural type NdMgNi 4 D 3.6 , spatial group Pmn2 1 ) and two cubic YMgNi 2 Fe 2 H 5.0 and YMgCo 2 Cu 2 H 3.8 (structural type LaMgNi 4 D 4.85 , spatial group F-43m) were synthesized. Volume expansion of the unit cell for saturated hydrides compared to their parent alloys is in the range 12-14%. In general, volume evolution is in good agreement with absorbed quantity of hydrogen.Electrode materials for the selected alloys were made and their main electrochemical characteristics (maximum discharge capacity and cyclic stability) were established. The nature of the transition metal is crucial in yttrium alloys. RMgM 4 alloys containing only Co, Fe, Cu are characterized by very low values of the discharge capacity, which does not exceed 50 mAh/h. YMgNi 4 -based alloys have elevated discharge capacity. Replacing nickel in the YMgNi 4 alloys by iron or manganese leads to some increase and then decrease discharge capacity. It is highest in the YMgNi 3 Mn (287 mAh/h) and YMgNi 3.5 Fe 0.5 (178 mAh/h) electrodes. When CeMgCo 4 is replaced by nickel the value of discharge capacity decreases. It is high only in alloys with the highest cobalt content: CeMgNiCo 3 (C max = 104 mAh/h).

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“…Zhipo Zhao et al analyzed the microstructure and corrosion behavior of cold-sprayed Zn-Al composite coating [6]. However, the grounding material works for long periods in the soil environment and grounding equipment is inevitably damaged by corrosion [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Corrosion Characteristics of Grounding Materials in Acid Red Soil

Shen¹,

Xu³

et al. 2022

Coatings

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The corrosion of grounding materials seriously threatens the safe operation of the power system. The corrosion resistance of four typical grounding materials as carbon steel, galvanized steel, Zn–Al-coated steel, copper was studied in acid red soil. The results show that carbon steel, galvanized steel, Zn–Al-coated steel, copper exhibit different corrosion resistance behaviors, respectively. The corrosion rate of these grounding materials usually increases first and then slowly decreases. Pitting corrosion is the main corrosion feature of carbon steel. The corrosion rate of carbon steel is the largest compared to the other three grounding materials. The corrosion rate of galvanized steel is higher than that of copper. Copper has a low corrosion rate and exhibits good corrosion resistance, but the cost of copper is high and it causes heavy metal pollution. The corrosion rate of Zn–Al-coated steel is the lowest compared to the other three grounding materials, and it has the best corrosion resistance.

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New Metal-Hydride Materials Based on R2–x Mg x Ni4 Alloys for Chemical Current Sources

Cited by 19 publications

References 38 publications

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Study on the Corrosion Characteristics of Grounding Materials in Acid Red Soil

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New Metal-Hydride Materials Based on R2–x Mg x Ni4 Alloys for Chemical Current Sources

Cited by 19 publications

References 38 publications

TbMgNi4-xCox–(H,D)2 System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi4-xCox–(H,D)2 System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

SYNTHESIS, STRUCTURE AND HYDROGEN SORPTION PROPERTIES OF THE SELECTED RMgM4 (R = Y, Ce; M = TRANSITION METAL) ALLOYS

Study on the Corrosion Characteristics of Grounding Materials in Acid Red Soil

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TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures

TbMgNi_4-xCo_x–(H,D)₂ System. I: Synthesis, Hydrogenation Properties, and Crystal and Electronic Structures