Preparation and characterization of spherical V2O3 nanopowder

Zheng, Chenmou; Zhang, Xinmin; He, Shan; Fu, Qun; Lei, Deming

doi:10.1016/s0022-4596(02)00038-5

Cited by 46 publications

(29 citation statements)

References 15 publications

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“…[17][18][19][20][21] Zheng et al 18 20 discovered a nonaqueous route to V 2 O 3 nanocrystals through solvothermal reaction of vanadium͑V͒ triisopropoxide with benzyl alcohol. Benzyl alcohol plays the roles of both reducing agent and surfactant and the reaction is performed at 200°C under nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase transition inV2O3nanocrystals

et al. 2010

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Magnetic phase transition in V2O3 nanocrystalsV 2 O 3 nanocrystals can be synthesized through hydrothermal reduction in VO͑OH͒ 2 using hydrazine as a reducing agent. Addition of different ligands to the reaction produces nanoparticles, nanorods, and nanoplatelets of different sizes. Small nanoparticles synthesized in this manner show suppression of the magnetic phase transition to lower temperatures. Using muon spin relaxation spectroscopy and synchrotron x-ray diffraction, we have determined that the volume fraction of the high-temperature phase, characterized by a rhombohedral structure and paramagnetism, gradually declines with decreasing temperature, in contrast to the sharp transition observed in bulk V 2 O 3 .

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Section: Introductionmentioning

confidence: 99%

Magnetic phase transition inV2O3nanocrystals

et al. 2010

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“…[11][12][13][14] The synthesis of spherical V 2 O 3 nanoparticles by the reductive pyrolysis of ammonium oxovanadium(IV) carbonato hydroxide has been reported. [15] Nanocrystalline V 2 O 3 was synthesized by the thermal decomposition of divanadium pentoxide by Su and Schlogl. [16] In this report, we present results of the RAPET dissociation (RAPET: reaction under autogenic pressure at elevated temperatures) of VO(OC 2 H 5 ) 3 , which produces carbon-coated vanadium oxide (CCVO).…”

mentioning

confidence: 99%

Testing Carbon‐Coated VO_x Prepared via Reaction under Autogenic Pressure at Elevated Temperature as Li‐Insertion Materials

Odani¹,

Pol²,

Pol³

et al. 2006

Advanced Materials

151

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V 2 O 3 powder is frequently used in conductive polymer composites and in catalysts. [1][2][3] In addition, a variety of VO x and MVO x (e.g., V 2 O 5 , V 6 O 13 , CaV 3 O 7 ) compounds have been suggested and tested as cathode materials for rechargeable Li batteries. [4][5][6][7][8][9][10] These vanadium oxide-based compounds are still among the most intensively studied cathode materials for rechargeable Li batteries. It should be noted that studies related to Li-battery materials are of high interest in materials science. [11][12][13][14] The synthesis of spherical V 2 O 3 nanoparticles by the reductive pyrolysis of ammonium oxovanadium(IV) carbonato hydroxide has been reported. [15] Nanocrystalline V 2 O 3 was synthesized by the thermal decomposition of divanadium pentoxide by Su and Schlogl. [16] In this report, we present results of the RAPET dissociation (RAPET: reaction under autogenic pressure at elevated temperatures) of VO(OC 2 H 5 ) 3 , which produces carbon-coated vanadium oxide (CCVO). This novel method, using only a metallic alkoxide precursor in the absence of a catalyst or a solvent, is a one-step process yielding a core/shell morphology. Further oxidation of the CCVO produces carbon-coated V 2 O 5 (CCV 2 O 5 ) nanoparticles. In the present study, we explore to what extent the carbon shell enables electrical contact among the CCVO particles, while not interfering with a smooth Li intercalation with the V 2 O 3 particles. It is interesting to discover whether these active materials can be used in composite electrodes for Li batteries, as they would possibly reduce the need for significant addition of carbonaceous materials, in order to maintain electrical contact among the particles and between the active mass and the current collector. Usually, composite cathodes based on Li-intercalating transition-metal oxides or sulfides have to include additional carbon particles (5-15 wt %) [17,18] in order to achieve electrical contact between the active mass and the current collector (and among the particles themselves). As the particles are smaller (which may be very important for achieving high rates), critical problems may arise regarding the electrical properties of the composite electrodes, because the carbon particles may not be in direct contact with all of the very small particles of the active mass. Hence, the use of an active mass where each particle is coated by a thin (conductive) carbon layer that is permeable to Li ions may be very advantageous for Li-battery application. This paper is the first report on the use of CCVO as the active mass in composite cathodes for rechargeable Li batteries. The carbon and hydrogen content in the CCVO samples was determined by elemental analysis measurements. The calculated elemental percentage of carbon in the precursor, VO(OC 2 H 5 ) 3 , was 44.3 %, while the elemental percentage of hydrogen was 9.6 %. The measured percentage of carbon in the carbon-coated V 2 O 3 (CCV 2 O 3 ) product is usually 30 %, while the percentage of hydrogen is only 0.3 %. Hence, it...

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“…A broad second-order transformation occurs at about 350 K to about 550 K from a PM phase to a second metal (PM') phase [19,21,22]. These feature properties make V 2 O 3 and its derivative compounds to have wide practical applications, such as optical devices, temperature sensors, field effect transistors, conductive composite polymer, catalyst and so on [19,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…In the previous decades, the fabrication of V 2 O 3 was mainly focused on bulk powders and spherical particles [23,[27][28][29][30][31][32]. Recently, some techniques for preparing V 2 O 3 with a novel morphology have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of V2O3/C composites with different morphologies by a facile route and phase transition properties of the compounds

Zhang

Wang

Huang

et al. 2014

Materials Science-Poland

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V 2 O 3 and amorphous carbon composites (V 2 O 3 /C composites) with different morphologies (e.g. nanospheres, nanorods and nanosheets) were, for the first time, successfully synthesized by a facile hydrothermal route and subsequent calcination. The as-obtained samples were characterized by X-ray powder diffraction (XRD), energy dispersive spectrometery (EDS), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The morphology of V 2 O 3 /C composites could be easily controlled by varying the reaction time, and, as a result, V 2 O 3 /C composites with nanospheres, nanorods and nanosheets were selectively synthesized. Furthermore, the phase transition property of V 2 O 3 /C composites was measured by differential scanning calorimetry (DSC), suggesting that V 2 O 3 /C composites exhibit the phase transition similar to V 2 O 3 , which could expand the potential applications of materials related to V 2 O 3 in the future.

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Preparation and characterization of spherical V2O3 nanopowder

Cited by 46 publications

References 15 publications

Magnetic phase transition inV2O3nanocrystals

Magnetic phase transition inV2O3nanocrystals

Testing Carbon‐Coated VO_x Prepared via Reaction under Autogenic Pressure at Elevated Temperature as Li‐Insertion Materials

Synthesis of V2O3/C composites with different morphologies by a facile route and phase transition properties of the compounds

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Preparation and characterization of spherical V2O3 nanopowder

Cited by 46 publications

References 15 publications

Magnetic phase transition inV2O3nanocrystals

Magnetic phase transition inV2O3nanocrystals

Testing Carbon‐Coated VOx Prepared via Reaction under Autogenic Pressure at Elevated Temperature as Li‐Insertion Materials

Synthesis of V2O3/C composites with different morphologies by a facile route and phase transition properties of the compounds

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Testing Carbon‐Coated VO_x Prepared via Reaction under Autogenic Pressure at Elevated Temperature as Li‐Insertion Materials