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Vanadiumnitride-energieopslagprincipe
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- Vanadiumnitride-energieopslagprincipe
Oxygen-Free Vanadium-Based Nanomaterials for …
The Mai group reported layer-by-layer stacked VS 2 nanosheets (VS 2-SNSs), which show excellent electrochemical performance in SIBs.The SEM image of VS 2-SNSs is shown in Fig. 9.3a.The VS 2-SNSs capacitance contributes 69% of the total charge at 1 mV s −1 (Fig. 9.3b).The first Coulombic efficiency can be as high as 85%, and the second and …
The vanadium-nitrogen system: a review
The Vanadium-Nitrogen System: A Review O.N. CARLSON, J. E SMITH, and R. H. NAFZIGER This paper is a critical review of the available phase equilibria, crystallographic, and thermodynamic
A first principles analysis of oxidation in titanium alloys with ...
We carry out first principles computations to understand mechanisms of oxygen accommodation on titanium surfaces doped with aluminum and vanadium. Our findings provide explanation in an atomistic level on why titanium alloys such as Ti-6Al-4 V (6 wt. % Al, 4 wt. % V, balance Ti) have a better oxidation resistance than commercially pure titanium.
Investigating the effect of nitrogen on the structural and tribo ...
Magnetron sputtering is one of the most commonly used deposition techniques, which has received considerable attention in industrial applications. In particular, owing to its compatibility with conventional fabrication processes, it can produce and fabricate high-quality dense thin films of a wide range of materials. In the present study, nitrogen (N) was combined …
Vanadium nitride quantum dots@carbon skeleton anode material ...
Vanadium nitride (VN) has received significant attention as a potential negative electrode material due to its remarkable theoretical and physical properties. However, the electrochemical performance needs to be improved due to its low specific surface area and the issue of being easily dissolved in electrolyte. Researches have shown that the composite …
Energy Storage Mechanism of Vanadium Nitride via Intercalating ...
The charge storage of vanadium nitride in KOH is contributed by two processes: The first benefit is from the K+ de/intercalation in the interplanar spacing, and the other one is …
New Production Route for Vanadium Nitride Master Alloy
A vanadium nitride alloy can be used as an alloying source of nitrogen and vanadium elements in high-strength steel. In this study, comprehensive and systematic experiments were conducted to optimize the process conditions for producing a vanadium nitride alloy from the starting materials (V2O5 and Fe2O3). The reduction and nitridation behaviors of …
Dynamic and structural stability of cubic vanadium nitride
5 HR-XTEM images and SAED patterns are acquired in a JEOL 2100 transmission electron microscope equipped with a LaB6 crystal field-emission source operated at 200 keV. Cross-sectional specimens are prepared by …
Energy Storage Mechanism of Vanadium Nitride via Intercalating ...
Energy Storage Mechanism of Vanadium Nitride via Intercalating Different Atomic Radius for Expanding Interplanar Spacing
Energy Storage Mechanism of Vanadium Nitride via Intercalating ...
Energy Storage Mechanism of Vanadium Nitride via Intercalating Different Atomic Radius for Expanding Interplanar Spacing Ying Liu, Lingyang Liu, Long Kang, and Fen Ran*
Vanadium nitride for aqueous supercapacitors: a topic review
Supercapacitors have emerged as the most attractive complementary devices between batteries and conventional capacitors, while a high performance electrode material is key to their energy …
Electronic structure of superconducting VN(111) films
Vanadium nitride (VN) is a transition-metal nitride with remarkable properties that have prompted extensive experimental and theoretical investigations in recent years. However, there is a current paucity of experimental research investigating the temperature-dependent electronic structure of single-crystalline VN. In this study, high-quality VN(111) films …
Novel Hybrid Nanoparticles of Vanadium Nitride/Porous Carbon …
Abstract Hybrid materials of vanadium nitride and porous carbon nanoparticles (VN/PCNPs) were fabricated by a facile pyrolysis process of vanadium pentoxide (V2O5) xerogel and melamine at relatively low temperature of 800 °C for supercapacitor application. The effects of the feed ratio of V2O5 to melamine (r), and nitrogen flow rate on the microstructure and …
PRECIPITATION AND GRAIN REFINEMENT IN VANADIUM
3 Fig. 1 shows Thermo-Calc calculations of the equilibrium precipitation of V(C,N) in steels microalloyed with vanadium. Also shown in this figure is the mole fraction of nitrogen in carbo -
A novel method of preparing vanadium-based precursors and …
V 2O 5 and NH 3.The N 2 in the tube furnace will use a protective atmosphere at low temperature, and NH 3 can reduce vana- dium(V) to low-value vanadium.With (NH 4) 2V 6O 16$1.5H 2Oas the vanadium source, the possible reaction equations and cor-responding thermodynamic data of the heating deamination
Oxygen-Free Vanadium-Based Nanomaterials for …
The Mai group reported layer-by-layer stacked VS 2 nanosheets (VS 2-SNSs), which show excellent electrochemical performance in SIBs.The SEM image of VS 2-SNSs is …
Non-isothermal kinetics of synthesizing vanadium nitride by one …
Vanadium nitride was synthesized by one-step method using V2O5 and carbon black as raw materials in nitrogen atmosphere. The phases of different reaction products prepared in different reaction temperatures were analyzed by X-ray diffraction (XRD), and the dynamic behavior of the process of synthesizing vanadium nitride (VN) by one-step method was studied …
Recent advances of fabricating vanadium nitride …
The continued growth of the global economy is heavily dependent on the development and use of fossil fuels (oil, natural gas, and coal, etc.). The increasing exploitation …
Vanadium nitride-vanadium oxide-carbon nanofiber hybrids for …
Vanadium Nitride (VN) is attractive for energy storage due to its high conductivity (1.6 × 10 6 S/m) and specific capacitance (1350 F/g) but limited to alkaline electrolytes for …
Vanadium nitride-vanadium oxide-carbon nanofiber hybrids for …
Vanadium Nitride (VN) is attractive for energy storage due to its high conductivity (1.6 × 10 6 S/m) and specific capacitance (1350 F/g) but limited to alkaline electrolytes for redox. In contrast, V 2 O 3 is redox active but not very conductive. In these hybrids a mixture of VN and vanadium oxide (V 2 O 3) were encapsulated in electrospun carbon-nanofibers.
Synthesis and Characterization of Vanadium Nitride/Carbon
The present work focuses on the synthesis of a vanadium nitride (VN)/carbon nanocomposite material via the thermal decomposition of vanadyl phthalocyanine (VOPC). The morphology and chemical structure of the synthesized compounds were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy …
Mechanochemical synthesis of vanadium nitride
Vanadium powder (Aldrich, 99.5%) was milled under pressure of 11 bars of high purity nitrogen gas (H 2 O and O 2 < 3 ppm) using a modified planetary ball mill (Fritsch, model Pulverisette 7). A steel vial of 45 cm 3 was used, with 6 steel balls and 5 g of V powder. The diameter and the weight of balls were 15 mm and 13.85 g, respectively, so the powder-to-ball …
Low-Temperature Preparation and Mechanism Study of …
Experimental Procedure. The solid powder raw material for preparing vanadium nitride (VN) is vanadium pentoxide (V 2 O 5, >99.9 wt.%).For preparing vanadium nitride, V 2 O 5 was placed in an alumina crucible and put into the constant-temperature zone of a horizontal resistance furnace. Initially, at the heating stage, a flow of Ar gas (99.999%) was introduced …
Study on reaction mechanism for the synthesis of vanadium …
The preparation process of VN using V 2 O 3 as the vanadium source, in the presence of reducing carbon powder and N 2, can be traced back to 1967 when James H. …
Preparation of Vanadium Nitride by Magnesiothermic Reduction of V
The development of a highly efficient and low-cost production process is instrumental for the wide application of vanadium nitride (VN). The strong affinity of vanadium …
Theoretical investigation on vanadium dinitrides from first …
More recently, the successful synthesis of transition metal dinitride TiN 2 by fcc-TiN and dense N 2 at high pressure (73 GPa) and high temperature (2400 K) has been reported in 2016 [23].The new transition metal dinitride adopts a CuAl 2-type structure and can be quenched from high pressure.Further theoretical investigation demonstrates the structure of …
Fabrication of a vanadium nitride/N-doped carbon hollow …
As observed in Fig. S3† and 3a–c, the VN/NCS nanocomposite inherits a sphere-like structure from the V 2 O 3 /C precursor after the NH 3 reduction treatment. The corresponding magnified scanning electron microscopy (SEM) image (inset in Fig. 3c) demonstrates that the VN/NCS composite has a rough surface and a mean size of 250 nm.Without the addition of NH 4 VO 3, …
Uncover the mystery of high-performance aqueous zinc-ion …
Great efforts have been dedicated to develop high-performance cathode materials in this field, including Mn-based oxides, Prussian blue analogs, organic polymers, and vanadium-based compounds [1, [12], [13], [14]] particular, vanadium-based compounds have become a research hotspot in recent few years mainly due to the multivalence of vanadium, amazing …
Energy Storage Mechanism of Vanadium Nitride via Intercalating ...
As a promising anode material in supercapacitors, vanadium nitride has been widely concerned due to its ultra-high theoretical specific capacitance. However, its routine test capacitance value is still far from the theoretical value and its energy storage mechanism is controversial. In order to solve these two key problems, here we prepare interplanar spacing expanded vanadium nitride ...
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