Hydrogen Storage in VNx-Hy Thin Films

Брык, В.В.; Guglya, A. G.; Kalchenko, Aleksandr; Marchenko, I. G.; Marchenko, Yuriy; Мельникова, Е.С.; Власов, В. В.; Zubarev, E. N.

doi:10.4236/oalib.1102228

Cited by 5 publications

(5 citation statements)

References 42 publications

(45 reference statements)

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“…At this potential and regarding the pH of the solution, we could assign this pair of redox peaks to the reversible reduction of V 3+ to V 2+ as proposed by Djire et al [47] An alternative explanation can be the role of native hydrogen adatoms following the reduction of water molecules. Indeed, there are already some reports about hydrogen storage in VN films [58,59] and it can be envisioned that this reaction could be electrochemically driven prior to hydrogen evolution. Thus, reversible electrochemical hydrogen storage cannot be ruled out especially according to the potential at which the couple of redox peaks is observed (≈−1 V versus Hg/HgO).…”

Section: Resultsmentioning

confidence: 99%

Major Improvement in the Cycling Ability of Pseudocapacitive Vanadium Nitride Films for Micro‐Supercapacitor

Jrondi

Buvat

Peña

et al. 2023

Advanced Energy Materials

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on a substrate by deposition methods allowing a fine control of film quality and thickness. [1][2][3] When talking about MSC, the total thickness of the stacked films is below 50 µm (substrate ≈ 500 µm) and the footprint surface (<1 cm 2 ) is controlled by etching technique (top down approach: chemical or plasma etching methods) or localized growth of the active material on current collector (bottom up approach: ink jet printing, electrodeposition).The first MSC was made in 2001 by Yoon et al.: the magnetron sputtering deposition technique was selected to stack electrode material and solid electrolyte on a silicon wafer giving rise to Si/SiO 2 /RuO 2 / LiPON/RuO 2 stacked layers. [4,5] The capacitance retention of this MSC was restricted (<1000 cycles) and the rate capability was limited owing to the low ionic conductivity of the LIPON solid electrolyte [6][7][8] (σ ionic ≈ 10 −6 S cm −1 at room temperature) but the triangular shape of the galvanostatic charge-discharge plot confirmed the pseudocapacitive properties of the RuO 2 /LIPON/RuO 2 MSC. More than 20 years after this first demonstration, it must be said that Vanadium nitride film made using a thin film deposition technique is a promising electrode material for micro-supercapacitor applications owing to its high electrical conductivity and high volumetric and surface capacitance values in aqueous electrolyte. Nevertheless, the cycling stability has to be improved to deliver good capacitance during a large number of cycles. Here, it is shown that vanadium nitride films made by a magnetron sputtering deposition method exhibit remarkable cycling stability (high capacitance retention value after 150 000 cycles), ultra-high rate capability (75% of the initial capacitance at 1.6 V s −1 ), while providing high surface capacitance values (≈1.4 F cm −2 ) and very low ageing of the VN electrodes (no loss of performance after 13 months). Additionally, new findings regarding the location of vanadium oxides species responsible for the charge storage mechanism in pseudocapacitive VN films are revealed by transmission electron microscopy electron energy-loss spectroscopy analyses at the nanoscale.

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Section: Resultsmentioning

confidence: 99%

Major Improvement in the Cycling Ability of Pseudocapacitive Vanadium Nitride Films for Micro‐Supercapacitor

Jrondi

Buvat

Peña

et al. 2023

Advanced Energy Materials

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“…PSA technology is used in 85% of the hydrogen production facilities globally . PSA units use multiple columns (4 to 12) to achieve high product purities (>99.999%) and are based on the selective adsorption of the other components of the mixture, as H 2 tends to interact poorly with the adsorbents used (H 2 tends to interact relatively strongly with noble and transition metals and less so with other inorganic moieties ,− ). Processes directed to producing only H 2 frequently use various adsorbents in different layers in the same bed, in order to optimize the adsorption–desorption cycle.…”

Section: Chemical Separations By Zeolitesmentioning

confidence: 99%

Zeolites in Adsorption Processes: State of the Art and Future Prospects

2022

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Zeolites have been widely used as catalysts, ion exchangers, and adsorbents since their industrial breakthrough in the 1950s and continue to be state-of the-art adsorbents in many separation processes. Furthermore, their properties make them materials of choice for developing and emerging separation applications. The aim of this review is to put into context the relevance of zeolites and their use and prospects in adsorption technology. It has been divided into three different sections, i.e., zeolites, adsorption on nanoporous materials, and chemical separations by zeolites. In the first section, zeolites are explained in terms of their structure, composition, preparation, and properties, and a brief review of their applications is given. In the second section, the fundamentals of adsorption science are presented, with special attention to its industrial application and our case of interest, which is adsorption on zeolites. Finally, the state-of-the-art relevant separations related to chemical and energy production, in which zeolites have a practical or potential applicability, are presented. The replacement of some of the current separation methods by optimized adsorption processes using zeolites could mean an improvement in terms of sustainability and energy savings. Different separation mechanisms and the underlying adsorption properties that make zeolites interesting for these applications are discussed.

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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 experiments on the hydrogen absorption and desorption were carried out using the purpose made equipment. Examples of preparation and examination techniques were described in the original papers [19][20][21][22][23].…”

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

confidence: 99%

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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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Hydrogen Storage in VNx-Hy Thin Films

Cited by 5 publications

References 42 publications

Major Improvement in the Cycling Ability of Pseudocapacitive Vanadium Nitride Films for Micro‐Supercapacitor

Major Improvement in the Cycling Ability of Pseudocapacitive Vanadium Nitride Films for Micro‐Supercapacitor

Zeolites in Adsorption Processes: State of the Art and Future Prospects

Nanocrystalline Porous Hydrogen Storage Based on Vanadium and Titanium Nitrides

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