A novel method of preparing vanadium-based precursors and …
1 Introduction Transition metal nitrides are attracting increasing focus owing to their excellent physical and chemical properties. 1–4 Vanadium nitride is widely used in alloy components, coatings, battery materials, supercapacitor materials, and catalytic carriers 5–12 due to its high melting point, excellent wear resistance, high-temperature stability, and excellent electrical ...
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 …
Gas-based reduction and nitridation for synthesis of vanadium …
VN can be prepared in various ways. Conventionally, VN is synthesized by carbothermal reduction of vanadium oxide or direct nitridation of pure metallic vanadium [12, 13].However, owing to the slow diffusion rate of solid–solid reaction, the former method usually requires a high temperature (above 1473 K) and a long reaction time, and large-scale …
A novel method to synthesize vanadium nitride ...
Here, we successfully combine SCS and ammonia reduction method to synthesize VN nanopowders for the first time. Firstly, nano-scaled vanadium dioxide (VO 2) precursors are fabricated via an ultrafast (within one minutes) SCS method by using ammonium metavanadate as a vanadium source, ammonium nitrate as an oxidizer, glycine as …
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.
vanadium nitride
Notes. Go To: Top Data from NIST Standard Reference Database 69: NIST Chemistry WebBook The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment.
Energy Storage Mechanism of Vanadium Nitride via Intercalating ...
In this equation, VN x O y ||OH − represents the forming of electrical double layer and VN x O y-OH means the Faraday reaction between OH − and VN x O y can be seen that both are directly related with hydroxyl ions adsorbed on "non-specific sites". [11-13] Some previous reported articles attempted to explain the reaction mechanism of VN under completely …
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 of these resources has raised concerns about resource depletion and sustainability [1] response to these challenges, efforts have been made to accelerate the development and research of …
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 …
Hydrothermal synthesis of vanadium nitride and modulation of its ...
Hydrothermal synthesis of vanadium nitride and modulation of its catalytic performance for oxygen reduction reaction† Taizhong Huang,‡*ab Shun Mao,‡b Guihua Zhou,b Zhenhai Wen,b Xingkang Huang,b Suqin Cib and Junhong Chen*b A creative hydrothermal synthesis method followed by …
Investigating the effect of nitrogen on the structural and tribo ...
where I(hkl) film is the normalized intensity of the (hkl) diffraction peak, which is equal to the intensity of (hkl) peak on the XRD pattern; I(hkl) bulk is the integral intensity of the bulk material peak after correction. The binding energy of the VN thin films was determined by X-ray Photoelectron Spectroscopy (XPS, Riber SIA 100 spectrometer) with a non-monochromatic …
Vanadium Nitride Nanowire Supported SnS2 Nanosheets with …
The vulnerable restacking problem of tin disulfide (SnS2) usually leads to poor initial reversible capacity and poor cyclic stability, which hinders its practical application as lithium ion battery …
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 …
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 …
Vanadium oxynitrides as stable catalysts for …
O on the nitride surface is reported to be unstable under N 2 RR conditions. Any O on the nitride surface is reduced and removed as water long before the system attends the N 2 RR onset potential. 29 Hence, in the working condition of N 2 …
Review ArticleRecent 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 of these resources has raised concerns about resource depletion and sustainability [1] …
A Novel Hierarchical Porous 3D Structured Vanadium Nitride
Transition-metal nitrides exhibit wide potential windows and good electrochemical performance, but usually experience imbalanced practical applications in the energy storage field due to aggregation, poor circulation stability, and complicated syntheses. In this study, a novel and simple multi-phase polymeric strategy was developed to fabricate …
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 …
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
Recent advances in vanadium-based nanomaterials and their …
In recent years, supercapacitors (SCs) have attracted considerable attention in the field of energy storage, and the design and engineering of effective electrode materials represent a critical …
High‐rate sodium‐ion storage of vanadium nitride via …
Vanadium nitride (VN) anode follows the surface-redox pseudocapacitive mechanism in the nonaqueous sodium-based electrolyte, that is, the redox (de)sodiations occurring with the V5+ at the surface of...
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 …
Electrochemical and Chemical Instability of Vanadium Nitride in …
Electrochemical nitrogen reduction (NRR) has attracted much attention as a promising technique to produce ammonia at ambient conditions in an environmentally benign and less energy-consuming ...
Low temperature chemical vapor deposition of ...
An excellent way to deposit transition nitride films at low temperatures is the reaction of transition metal dialkylamido precursors, M(NR 2) x, and ammonia. 5,6 Such depositions generally occur by means of a transamination reaction in which the NR 2 ligands (where R is an alkyl group) are replaced with NH x groups (x = 1 or 2), which subsequently …
Mechanism and experimental study on preparation of high-quality ...
According to the literature [26, 27], we can know that reaction (R1) V 2 O 3 + 3C + N 2 (g) = 2VN + 3CO(g) is the total equation of the process of preparing VN by carbothermal reduction nitridation of V 2 O 3.Therefore, to study the effect of pressure on the reaction temperature of vanadium trioxide carbothermal reduction nitridation reaction, equation (1) was …
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 …
Vanadium based materials as electrode materials for high performance ...
The cyclic voltammogram of noble metal oxides (MOs) such as RuO 2 and IrO 2 electrodes have an almost rectangular shape and exhibit excellent capacitor behavior [23], [24].A very high specific capacitance of up to 750 F g −1 was reported for RuO 2 prepared at relatively low temperatures. Conducting metal oxides like RuO 2 or IrO 2 were ideal electrode …