Vanadium carbide with periodic anionic vacancies for effective
The resultant vanadium carbide possesses abundant periodic carbon vacancies (12.5 at.%) and mesoporous structure, which not only provide coordinatively unsaturated sites to adsorb and activate N 2 molecule through π-back-donation process, thus promoting the catalyzing of N 2 to NH 3, but also facilitate the fast mass transfer …Web
اقرأ أكثرN-doped vanadium carbide combined with Pt as a multifunctional
Recently, Tian and coworkers reported the vanadium carbide (VC) as an efficient and versatile cocatalyst for photocatalytic hydrogen evolution over various semiconductor photocatalysts [29], such as CdS, TiO 2 and g-C 3 N 4, and even as a robust cocatalyst for dye-sensitized system [30]. It is noted that the combination of carbides and …Web
اقرأ أكثرFirst-principles study of vanadium carbides as electrocatalysts for
Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. Herein we apply first-principles calculations to systematically anaWeb
اقرأ أكثرTop 4 Vanadium-producing Countries
The Asian nation far outpaces all other countries in terms of vanadium-mining output, and leads the world in vanadium consumption as well due to its high steel production. 2. Russia. Mine ...Web
اقرأ أكثرDecoding the Vanadium Carbide Powders Market: A Deep Dive …
Vanadium carbide powders have diverse applications in various industries. In the metallurgical sector, they are widely used as an alloying element in the production of high-speed tools, wear ...Web
اقرأ أكثرSynthesis of Vanadium Carbide by Mechanical Activation …
Vanadium carbide is known, for its hardness and other unique properties, as a refractory material. The synthesis of vanadium carbide is always associated with the utilization of expensive active ...Web
اقرأ أكثرVanadium Carbides
Vanadium carbide (V 2 CT x) MXene was successfully used as a sensor for the sensing of nonpolar gases [156]. The developed sensor has shown high ability to detect both gases methane and hydrogen with detection limits of 25 and 2 ppm, respectively. ... The first two mentioned production methods are capable of depositing …Web
اقرأ أكثرCarbides of Transition Metals: Properties, Application and Production
The mechanical properties of the metal ceramic were increased by the addition of superfine niobium carbide (NbC) and vanadium carbide (VC), and their optimum values were a flexural strength of ...Web
اقرأ أكثرGuidelines for Synthesis and Processing of Chemically Stable …
Vanadium carbide MXenes, specifically V 2 CT x, have shown promise for applications ranging from energy storage and sensing to electronics and optics. In the …Web
اقرأ أكثرVanadium Carbide Powders Market Size, Growth, Forecast …
Vanadium carbide powders are a type of chemical compound that contain vanadium (V) and carbon ©. These powders are widely used in various industrial applications, including the production of…Web
اقرأ أكثرGuidelines for Synthesis and Processing of Chemically Stable …
Vanadium carbide MXenes, specifically V 2 CT x, have shown promise for applications ranging from energy storage and sensing to electronics and optics.In the past decade, however, research involving V 2 CT x has been mostly limited to its multilayered form due to instability of delaminated V 2 CT x in its colloidal state. In this paper, we …Web
اقرأ أكثرStudy of Vanadium Carbide Structures Based on Ve and Ev
VC is an incredibly hard refractory ceramic with exceptional wear resistance, high modulus of elasticity (400 GPa), and good strength retention even at high temperatures [ 26 – 28 ]. VC coatings are used in corrosion prevention, cutting tool application, machining, drilling, and dyeing. Some industrial uses of VC are given in [ 27, 29 – 31 ].Web
اقرأ أكثرA Simple and Novel Route for Synthesis of Vanadium …
Vanadium carbide (VC) is particularly important for industrial applications due to its excellent high temperature strength, ... and the production exhibits high specific surface area, well-defined chemical compositions, …Web
اقرأ أكثرRecent Progress in Emerging Two-Dimensional Transition Metal Carbides
2.2 Vanadium Carbide. The vanadium carbide with stoichiometric composition (VC) cannot be obtained under equilibrium conditions. It usually has extensive homology disordered δ-VC 1-x (VC 0.65-VC 0.90) crystallizes with a NaCl cubic structure.Carbon atoms in NaCl-type vanadium carbides can only fill the octahedral …Web
اقرأ أكثرReducing the high hydrogen binding strength of vanadium carbide …
Reducing the high hydrogen binding strength of vanadium carbide MXene with atomic Pt confinement for high activity toward HER. Author links open overlay panel Seungyoung Park a 1, Yea-Lee Lee b 1, Yeoheung Yoon a, ... enabling the mass production of hydrogen via a renewable energy route [1], [2]. Highly active …Web
اقرأ أكثرCPM-S60V
In fact with powder metallurgy production, vanadium carbides are usually smaller than the common chromium carbides or molybdenum/tungsten carbides since they are more stable and coarsen more slowly. Crucible Steel metallurgists took advantage of this fact with the development of CPM-10V which had high amounts of vanadium …Web
اقرأ أكثرIntegrating noble-metal-free metallic vanadium carbide cocatalyst with
Developing highly active and stable cocatalysts at lower costs is greatly crucial for high-performance semiconductor-based photocatalytic H 2 evolution from water splitting. Herein, we report that noble-metal-free metallic vanadium carbide (VC) can function as a superior cocatalyst when integrated with CdS for efficient photocatalytic H 2 …Web
اقرأ أكثر(PDF) Synthesis and structural evolution of vanadium carbide in …
Probably, this is due to the method of production of vanadium carbide powders, especially nanocrystalline powders -plasmochemical synthesis [7], mechanosynthesis [8], temperature programmed ...Web
اقرأ أكثرProspects challenges and stability of 2D MXenes for clean energy
A multilayered ternary carbide (MAX powder, here, M 3 AC 2) was mixed with an acidic solution of HF (for example, HCl-LiF) to produce multilayered M 3 C 2 T x MXenes.Web
اقرأ أكثرVanadium carbonitride and vanadium–aluminum alloy
In Union Carbide, VC is produced using a vacuum furnace with V 2 O 3, iron powder, and carbon powder as raw materials, which is heated to 1350°C, and kept at this temperature for 60 h under vacuum. South Africa's Vametco mineral company is a subsidiary of Strategic Minerals, United States (STRATCOR), which specializes in the …Web
اقرأ أكثرVanadium metal
Production of vanadium metal from vanadium oxide by carbon reduction is achieved above 1700°C, where some stable vanadium carbide (VC or VC 2) can be produced. The stability of CO is higher than that of vanadium oxide, which is reduced in the following sequence during carbon thermal reduction: V 2 O 5, V 2 O 4, V 2 O 3, VO, …Web
اقرأ أكثرCarbides of Transition Metals: Properties, Application and …
To produce the vanadium carbide, vanadium(III) oxide is reduced by means of carbon nanofiber in an induction furnace with an argon atmosphere. The …Web
اقرأ أكثرGreen preparation of vanadium carbide through one-step molten …
Vanadium carbide (VC) as excellent ceramic and functional material is usually prepared by carbothermal reduction of V 2 O 5 which must be extracted from a typical V slag by complex processes. Pollutants, such as ammonia-nitrogen wastewater, NH 3 and CO 2 are inevitably discharged. A novel and green method for VC preparation was …Web
اقرأ أكثرFirst-principles study of vanadium carbides as electrocatalysts for
Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), …Web
اقرأ أكثرOxygen reduction catalytic characteristics of vanadium carbide …
To develop low-cost and high-performance non-precious metal-based oxygen reduction catalysts, we investigate the structure and catalytic performance of industrialized vanadium carbide (VC) and nitrogen doped vanadium carbide (V(C, N)). The structure of VC and V(C, N) were examined by XRD, SEM and XPS tests. Results …Web
اقرأ أكثرSynthesis of Fine Vanadium-Carbide (VC0.88) Powder Using …
The synthesis of fine vanadium-carbide (VC0.88) powder is considered. To produce the vanadium carbide, vanadium(III) oxide is reduced by means of carbon nanofiber in an induction furnace with an argon atmosphere. The carbon nanofiber is produced by the catalytic decomposition of light hydrocarbons. The specific surface of …Web
اقرأ أكثرSynthesis and structural evolution of vanadium carbide in nano …
Since vanadium carbide is chemically stable at room temperature and cannot be easily attacked even by strong acids, to remove the by-product (MgO), the as-milled powders were treated with 5% acetic acid solution. To complete phase formation, microwave heating was performed for 24 h milled samples.Web
اقرأ أكثرComparison Between Vanadium and Niobium Effects on the
Furthermore, the volume fraction of vanadium carbide precipitates is less than niobium carbide precipitates due to the fact that the solubility of V is approximately an order of magnitude greater than that of Nb in the temperature of 760–840 °C. ... C. Lebeau, Production and control of HSLA steel castings. AFS Trans. 92, 645 (1984)Web
اقرأ أكثرA new type of vanadium carbide V5C3 and its hardening by
Taking the V-C binary system as an example, here we report the first-principles prediction of a new type of vanadium carbide, V 5 C 3, which has an …Web
اقرأ أكثرA novel method of preparing vanadium-based precursors and …
Vanadium nitride is widely used because of its excellent properties. The existing production methods are affected by the problems of complex preparation for the vanadium source, high temperature, and low N content. In this work, a wide range of vanadium solutions were used as the vanadium source to prepare vanadium nitride …Web
اقرأ أكثر