Structure of the α–β Interface in a PdCu Solid Solution

Иевлев, В. М.; Prizhimov, A. S.; Донцов, А. И.

doi:10.1134/s1063783420010138

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…The phase separation of the equiatomic The fourfold increase in the hydrogen permeability for approximately 6 h is caused by foil recrystallization (α-phase), resulting in crystallite growth and decrease in the fraction of interfaces retarding hydrogen transfer. In this case, hydrogen permeability of the foil reaches the level characteristic of best membranes of palladium alloys [31].…”

Section: Discussionmentioning

confidence: 77%

Dependence of the Atomic Structure of Solid Solutions in the Pd-Cu System Ordered According to the B2 Type on the Composition

et al. 2022

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Owing to exceptionally high selectivity, membranes based on palladium alloys are widely used for obtaining high-purity hydrogen. An important issue for providing high hydrogen permeability of the membranes is to form the required phase composition. The structural organization of the solid solutions consisting of Cu–36.4 at .% Pd and Cu–50 at .% Pd were studied by X-ray diffraction (XRD), electron diffraction (ED), high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDXS). It was found that the former composition can be ordered in the temperature range of 300–400 °C and in the heating (up to 800 °C)–cooling cycle. In the presence of excess Cu atoms (27.2%), this structure can be represented by CsCl type structural units (β-phase) and distributed body center cubic (BCC) copper structural units in the corresponding concentration dose. The formation of a single crystal ordered phase within the mosaic blocks of the disordered phase was established. Experimental evidence was obtained for the separation of the α-phase solid solution in the elemental composition; the very low rate of ordering inherent in this system was attributed to this effect. The hydrogen permeability of a foil of the equiatomic composition was described.

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Section: Discussionmentioning

confidence: 77%

Dependence of the Atomic Structure of Solid Solutions in the Pd-Cu System Ordered According to the B2 Type on the Composition

et al. 2022

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“…Interestingly, some experimental studies reveal that hydrogen diffusion in GB of nickel is much faster than that in bulks due to a lower activation energy, 3,6 whereas the hydrogen diffusivity in GB of aluminum and nickel with ne grains is smaller than that in the bulks. 7,10,11,13 As to hydrogen diffusion in PdCu membranes, the reported experimental results are mainly concentrated on the polycrystalline phases, [19][20][21][22][24][25][26][27][28][29][30][31][32][33][34][35]37,39 while the theoretical investigations are all related to single crystals. 17,23,36,38,[40][41][42] It is therefore of importance to nd out the effect of GB on hydrogen diffusion of PdCu by means of rst principles calculation.…”

Section: Hydrogen Diffusivity At S3 Grain Boundary Of Pdcumentioning

confidence: 99%

Hydrogen solubility and diffusivity at Σ3 grain boundary of PdCu

Liu

Gong

2021

RSC Adv.

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Hydrogen energy: development prospects and materials

2021

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The review addresses the prospects of global hydrogen energy development. Particular attention is given to the design of materials for sustainable hydrogen energy applications, including hydrogen production, purification, storage, and conversion to energy. The review highlights the key role of oxide-supported metal or alloy nanoparticles as catalysts in the hydrogen production via the conversion of natural gas or alcohols. An alternative approach is the pyrolysis of hydrocarbons giving hydrogen and carbon. The direct production of high-purity hydrogen can be performed using electrolysis or membrane catalysis. Apart from conventional hydrogen storage methods such as the compression and liquefaction, the hydrogen alloy absorption and chemical conversion to liquid carriers (ammonia and toluene cycles) are considered. Fuel cells, containing catalysts and proton-conducting membranes as the key components, are used for hydrogen energy generation. Binary platinum alloys or core – shell structures supported on carbon or oxides can be employed to facilitate the oxygen electroreduction and CO electrooxidation in low-temperature fuel cells. High conductivity and selectivity are provided by perfluorinated sulfonic acid membranes. The high cost of the latter materials dictates the development of alternative membrane materials. A crucial issue in high-temperature fuel cells is the necessity of reducing the operating temperature and ohmic losses. This problem can be solved by designing thin-film materials and replacing oxygen-conducting ceramic membranes by proton-conducting membranes. The bibliography includes 290 references.

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Structure of the α–β Interface in a PdCu Solid Solution

Cited by 7 publications

References 13 publications

Dependence of the Atomic Structure of Solid Solutions in the Pd-Cu System Ordered According to the B2 Type on the Composition

Dependence of the Atomic Structure of Solid Solutions in the Pd-Cu System Ordered According to the B2 Type on the Composition

Hydrogen solubility and diffusivity at Σ3 grain boundary of PdCu

Hydrogen energy: development prospects and materials

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