Synthesis of Mo2C by Thermal Decomposition of Molybdenum Blue Nanoparticles

Гаврилова, Н.Н.; Dyakonov, V. A.; Myachina, Maria; Назаров, В. В.; Скудин, В. В.

doi:10.3390/nano10102053

Cited by 19 publications

(22 citation statements)

References 59 publications

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“…Microporosity is due to the presence of amorphous carbon, and mesoporosity with a predominant diameter around 4 nm corresponds to the structure of molybdenum carbide, in which pores are formed due to sintering of primary particles. A similar porous structure is observed in the synthesis of molybdenum carbide using ascorbic acid as a carbon source [ 32 ].…”

Section: Resultssupporting

confidence: 57%

“…The parameters of catalytic activity (the rate constant k 900 and specific rate constant k s 900 ) were calculated according to the work [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

“…A molybdenum blue dispersion synthesized with ascorbic acid was successfully used to prepare Mo 2 C [ 32 ]. The molar ratio (R/Mo) is the main parameter that affects the morphology, pore structure, and phase composition of molybdenum carbide.…”

Section: Introductionmentioning

confidence: 99%

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Simple Synthesis of Molybdenum Carbides from Molybdenum Blue Nanoparticles

et al. 2021

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In recent years, much attention has been paid to the development of a new flexible and variable method for molybdenum carbide (Mo2C) synthesis. This work reports the applicability of nano-size clusters of molybdenum blue to molybdenum carbide production by thermal treatment of molybdenum blue xerogels in an inert atmosphere. The method developed made it possible to vary the type (glucose, hydroquinone) and content of the organic reducing agent (molar ratio R/Mo). The effect of these parameters on the phase composition and specific surface area of molybdenum carbides and their catalytic activity was investigated. TEM, UV–VIS spectroscopy, DTA, SEM, XRD, and nitrogen adsorption were performed to characterize nanoparticles and molybdenum carbide. The results showed that, depending on the synthesis conditions, variants of molybdenum carbide can be formed: α-Mo2C, η-MoC, or γ-MoC. The synthesized samples had a high specific surface area (7.1–203.0 m2/g) and meso- and microporosity. The samples also showed high catalytic activity during the dry reforming of methane. The proposed synthesis method is simple and variable and can be successfully used to obtain both Mo2C-based powder and supports catalysts.

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Section: Resultssupporting

confidence: 57%

“…The parameters of catalytic activity (the rate constant k 900 and specific rate constant k s 900 ) were calculated according to the work [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

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Simple Synthesis of Molybdenum Carbides from Molybdenum Blue Nanoparticles

et al. 2021

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“…Previously, we studied, in detail, the formation of nanoparticles of molybdenum blue, synthesized using various organic reducing agents [ 21 , 38 , 39 ]. The developed synthesis method is suitable for obtaining stable dispersions of both molybdenum blue and molybdenum–tungsten blue and applicable for obtaining catalytic materials based on transition metal carbides with the sol–gel method [ 34 , 35 , 40 , 41 ]. However, the significance of the research carried out in the field of the synthesis of dispersions of molybdenum and molybdenum–tungsten blue lies not only in applied applications but also in considering the fundamental problems of formation-associated colloid systems [ 42 , 43 ].…”

Section: Discussionmentioning

confidence: 99%

“…The use of a highly dispersed precursor, containing polyoxometalate nanoclusters, leads to the formation of carbide phase with a small particle size and high specific surface area [ 28 , 34 ]. However, the first stage in the development of a method for obtaining highly dispersed carbides is to establish the conditions for the formation of molybdenum–tungsten blue nanoparticles and the possibility of obtaining their stable dispersions.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum–Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides

et al. 2021

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Herein, we demonstrate a promising method for the synthesis of ultrafine carbide particles using dispersions of molybdenum–tungsten nanoparticles. Dispersions of molybdenum–tungsten blue nanoparticles with different initial molar ratios of molybdenum/tungsten were synthesized through the reduction of molybdate and tungstate ions by ascorbic acid in an acidic medium (pH = 1.0–2.5). Molybdenum–tungsten blue nanoparticles were characterized by ultraviolet–visual (UV–VIS), infrared (FTIR), and X-ray photoelectron (XPS) spectroscopies; transmission electronic microscopy (TEM); and dynamic light scattering (DLS). We demonstrated that molybdenum–tungsten blue nanoparticles belong to toroidal polyoxometalate clusters (λmax = 680–750 nm) with a predominant particle size of 4.0 nm. Molybdenum–tungsten blue dispersions were shown to be monodispersed systems with a small particle size and long-term stability (>30 days) and are suitable for further catalytic applications.

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Atomic and Electronic Reconstruction in Defective 0D Molybdenum Carbide Heterostructure for Regulating Lower‐Frequency Microwaves

Yuan

Cheng

et al. 2023

Adv Funct Materials

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Abstract0D nanomaterials with high efficiency of atom utilization possess extraordinary tunability over bulk materials. Precise reconstruction of atoms in a 0D nanoparticle toward tuning of crystalline phases and defects is highly desirable but remains a grand challenge. In this study, a crystallization rate‐controlled strategy is reported to achieve controllable reconstruction of atoms in situ, which inducts a series of monodisperse 0D molybdenum carbide nanoparticles (MoxC NP) that anchor on a carbon matrix with adjustable crystalline phases and atom vacancies. Aberration‐corrected transmission electron microscopy, electron paramagnetic resonance technique, density functional theory calculation, and electron holography jointly reveal the atomic reconstruction process and confirm its remarkable effects of optimizing the local electronic states and enhancing the heterointerface interactions. As a result, the optimized MoC/Mo2C heterostructure on the carbon matrix is shown to enable the promoted dielectric response and generate more than 90% absorption of lower‐frequency microwaves (the current 5th‐generation communication band). The control of atomic reconstruction may provide an effective pathway for unlocking tunable dielectric properties of 0D nanomaterials toward various technological applications.

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Synthesis of Mo2C by Thermal Decomposition of Molybdenum Blue Nanoparticles

Cited by 19 publications

References 59 publications

Simple Synthesis of Molybdenum Carbides from Molybdenum Blue Nanoparticles

Simple Synthesis of Molybdenum Carbides from Molybdenum Blue Nanoparticles

Molybdenum–Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides

Atomic and Electronic Reconstruction in Defective 0D Molybdenum Carbide Heterostructure for Regulating Lower‐Frequency Microwaves

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