On the feasibility of developing hydrogen storages capable of adsorption hydrogen both in its molecular and atomic states

Goncharov, A. V.; Guglya, A. G.; Мельникова, Е.С.

doi:10.1016/j.ijhydene.2012.08.142

Cited by 25 publications

(14 citation statements)

References 69 publications

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“…An equation for the thermal voltage is given in (13), which is based on the Boltzmann constant k B (1.3806•10 −23 J K −1 ) and the electron charge e (1.602 19•10 −19 C) [72]. Additionally, the number of serially connected cells, n s , and the cell temperature are required.…”

Section: Solar Photovoltaic Powermentioning

confidence: 99%

“…Often, the wind velocity is measured at rooftops or special measurement facilities with a defined height of approximately 10 m, which is significantly lower than the height of a wind turbine, around 100 m [84]. Therefore, the measured data should be corrected to the desired height by (14).…”

Section: Wind Powermentioning

confidence: 99%

“…For large-scale applications, the hydrogen can be stored in salt caverns, storage tanks, or the gas grid [8][9][10][11][12]. Smaller hydrogen quantities can also be stored in metal hydrides [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Alkaline Water Electrolysis Powered by Renewable Energy: A Review

2020

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Alkaline water electrolysis is a key technology for large-scale hydrogen production powered by renewable energy. As conventional electrolyzers are designed for operation at fixed process conditions, the implementation of fluctuating and highly intermittent renewable energy is challenging. This contribution shows the recent state of system descriptions for alkaline water electrolysis and renewable energies, such as solar and wind power. Each component of a hydrogen energy system needs to be optimized to increase the operation time and system efficiency. Only in this way can hydrogen produced by electrolysis processes be competitive with the conventional path based on fossil energy sources. Conventional alkaline water electrolyzers show a limited part-load range due to an increased gas impurity at low power availability. As explosive mixtures of hydrogen and oxygen must be prevented, a safety shutdown is performed when reaching specific gas contamination. Furthermore, the cell voltage should be optimized to maintain a high efficiency. While photovoltaic panels can be directly coupled to alkaline water electrolyzers, wind turbines require suitable converters with additional losses. By combining alkaline water electrolysis with hydrogen storage tanks and fuel cells, power grid stabilization can be performed. As a consequence, the conventional spinning reserve can be reduced, which additionally lowers the carbon dioxide emissions.

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Section: Solar Photovoltaic Powermentioning

confidence: 99%

Section: Wind Powermentioning

confidence: 99%

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Alkaline Water Electrolysis Powered by Renewable Energy: A Review

2020

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“…Ions with such energies bombarding the film during its deposition create a large number of defects that become the centers of grain nuclei formation. Consequently, the nanocrystalline structures with grains less than 10 nm are created [19,20].…”

Section: Ion-beam Assisted Deposition As the Methods Of Producing Nanomentioning

confidence: 99%

“…The IBAD technology produces both dense and porous nanocrystalline thin-film structures [19,21]. It is known that the path depth of ions with an energy of several tens keV in the solid body crystal lattice is 50-100 nm.…”

Section: Ion-beam Assisted Deposition As the Methods Of Producing Nanomentioning

confidence: 99%

Nanocrystalline Porous Hydrogen Storage Based on Vanadium and Titanium Nitrides

Goncharov

Guglya

Kalchenko

et al. 2017

Journal of Nanotechnology

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This review summarizes results of our study of the application of ion-beam assisted deposition (IBAD) technology for creation of nanoporous thin-film structures that can absorb more than 6 wt.% of hydrogen. Data of mathematical modeling are presented highlighting the structure formation and component creation of the films during their deposition at the time of simultaneous bombardment by mixed beam of nitrogen and helium ions with energy of 30 keV. Results of high-resolution transmission electron microscopy revealed that VNxfilms consist of 150–200 nm particles, boundaries of which contain nanopores of 10–15 nm diameters. Particles themselves consist of randomly oriented 10–20 nm nanograins. Grain boundaries also contain nanopores (3–8 nm). Examination of the absorption characteristics of VNx, TiNx, and(V,Ti)Nxfilms showed that the amount of absorbed hydrogen depends very little on the chemical composition of films, but it is determined by the structure pore. The amount of absorbed hydrogen at 0.3 MPa and 20°C is 6-7 wt.%, whereas the bulk of hydrogen is accumulated in the grain boundaries and pores. Films begin to release hydrogen even at 50°C, and it is desorbed completely at the temperature range of 50–250°C. It was found that the electrical resistance of films during the hydrogen desorption increases 104times.

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Cyclic Dehydrogenation–(Re)Hydrogenation with Hydrogen‐Storage Materials: An Overview

2015

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Hydrogen‐storage materials (HSMs) have especially revolutionized the field of “hydrogen storage” by offering a relatively safe storage alternative and high gravimetric hydrogen density. However, a critical challenge is storage reversibility. This is the central tenet of the present article, which discusses ways to close the hydrogen cycle with solid‐ and liquid‐phase HSMs. A distinction between the different HSMs is made on the basis of the approach under which they can be rehydrogenated; this led to the proposition of distribution in three categories: one, materials allowing reversible storage of H2; two, hydrogen carriers for which the byproducts must be recycled; three, sustainable hydrogen carriers with which the hydrogen cycle is considered as being byproduct free. From our analysis, supported by many examples, it seems that the hydrogen cycle can be closed with all of the HSMs discussed herein and that the dehydrogenation/rehydrogenation paths depend on their nature.

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On the feasibility of developing hydrogen storages capable of adsorption hydrogen both in its molecular and atomic states

Cited by 25 publications

References 69 publications

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

Nanocrystalline Porous Hydrogen Storage Based on Vanadium and Titanium Nitrides

Cyclic Dehydrogenation–(Re)Hydrogenation with Hydrogen‐Storage Materials: An Overview

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