Structure and hydrogen permeability of V–15Ni alloy

Baraban, A. P.; Gabis, I. E.; Kozhakhmetov, Samat; Murzinova, M. A.; Piven, V. A.; Sidorov, N. I.; Sipatov, I. S.; Voyt, A.P.

doi:10.1016/j.ijhydene.2019.08.224

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…The microstructural changes in the alloy after the experiments cannot be excluded as well. Processing methods and various surface structures of the vanadium alloy also affects hydrogen permeation by affecting vanadium–hydrogen interaction. ,, Nevertheless, the different patterns of hydrogen permeability when different gases were applied during the thermal treatment inferred structural changes in the alloy induced by temperature and hydrogen permeation cannot be a sole contributor to this phenomenon. However, thorough structural analysis was beyond the scope of this study.…”

Section: Resultsmentioning

confidence: 99%

“…Other studies reported the similar magnitude of hydrogen permeability (2 × 10 –10 mol –1 ·m –1 ·s –1 ·Pa –0.5 ) without palladium coating, while with a palladium coating, the permeability of V–Ni was at least 100 times higher than the alloy without the coating. 8 The difference in the permeability stems from the fabrication method (without annealing) and feed hydrogen pressure (6.5–8 kPa).…”

Section: Resultsmentioning

confidence: 99%

“…Hydrogen bearing vanadium materials become brittle when the hydrogen concentration in metal exceeds 0.22 [hydrogen/metal (H/M)] . Thus, to reduce the solubility of hydrogen, substituting vanadium with other metals has been adopted to maintain the stability and performance of vanadium-based materials. , Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. , Dolan et. al.…”

Section: Introductionmentioning

confidence: 99%

“… 5 , 6 Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. 7 , 8 Dolan et. al.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Gas for Thermal Treatment on Hydrogen Permeation in V–Ni Alloy Membranes

2023

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Hydrogen separation is an important step for the utilization of hydrogen energy. Metallic alloys, such as vanadium−nickel, are potential hydrogen separation materials. Due to the strong propensity of vanadium to form oxides and hydrides, vanadium alloy has a lower hydrogen permeability, and it is difficult to maintain the permeability over time. Therefore, special preparation processes such as Pd coating have been suggested for hydrogen separation vanadium-based membranes. However, aside from the prohibitive price of palladium, the interdiffusion of palladium and vanadium makes the coated membrane inviable to be used at a high temperature. Thermal treatment with inert gas was investigated in this study to assess the applicability of the vanadium alloy without palladium coating for hydrogen separation and clarify the mechanism behind the thermal treatment. Argon is inert with vanadium and displayed permeability recovery after 43 h thermal treatment, but the permeability declined under certain conditions. In contrast, nitrogen is known to interact with vanadium and the hydrogen permeability was maintained at a level lower than the test with argon. Given that nitrogen can compete with hydrogen for the active sites on vanadium, nitrogen might hinder hydrogen adsorption and hydride formation, whereas argon reduced the partial pressure of hydrogen during the thermal treatment, enhancing the driving force of hydrogen desorption. In the X-ray diffraction spectrum, vanadium hydrides and oxides were confirmed after hydrogen permeation and thermal treatment. In the X-ray photoelectron spectroscopy data, oxygen was a dominant element due to vanadium oxides and adsorbed nitrogen was also observed. According to binding energy shifts of nitrogen, nitrogen used for thermal treatment might substitute or compete for active sites with adsorbed nitrogen and hydrogen, existing in vanadium lattice. Although thermal treatment can be used to recover hydrogen permeability, the alloy cannot be recovered as hydrogen-free. However, results demonstrate the potential of thermal treatment to complement an uncoated vanadium alloy for a hydrogen separation membrane.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“… 5 , 6 Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. 7 , 8 Dolan et. al.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Gas for Thermal Treatment on Hydrogen Permeation in V–Ni Alloy Membranes

2023

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“…Pd Ag серии «В» с оптимальным легирующим составом после тщательных исследований [3,4]. Но поскольку сплавы Pd отличает высокая дороговизна, нами [5][6][7][8] ведутся активные разработки альтернативных составов -металлов V группы (Ta , Nb , V ), учитывая их ОЦК-структуру, благоприятную для ускорения диффузии и проницаемости водорода, а также стойкость этих металлов к водородному охрупчиванию [9,10]. Было обнаружено, что переход пластичного состояния в хрупкое состояние происходит резко при достижении концентрации водорода / HM 0, 25 для чистого ниобия и / HM 0, 22 для чистого V в интервале температур от 573 до 773 К. Этот факт говорит о том, что устойчивость к водородному охрупчиванию металлов V группы может быть улучшена путем сохранения концентрации водорода ниже / HM 0, 2 [10].…”

Section: Introductionunclassified

Hydrogen Permeability Through Tantalum Alloys Allowed With Nb and W

Белякова¹,

Полухин²

2020

Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials

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Проведен анализ исследований мембранных сплавов TaNb и TaW с оценкой их характеристик - термостабильности, прочности - измерением микротвердости, матричной структуры - рентгеновским анализом, а также динамики водорода - диффузии (теоретически) и экспериментально - проницаемости. Эффективность выделения водорода с применением сплавов TaNb и TaW превышала таковую палладиевых, измеренной при тех же условиях испытаний. An analysis of studies of membrane alloys TaNb and TaW was carried out with an estimation of their characteristics - thermal stability, strength - by measuring microhardness, matrix structure - by X-ray analysis, as well as the dynamics of hydrogen - diffusion (theoretically) and permeability (experimentally). The efficiency of the hydrogen separation/purification using the TaNb and TaW alloys was higher than that of palladium, measured under the same test conditions.

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