Isothermal reduction of V2O5 powder using H2 as oxygen carrier: Thermodynamic evaluation, reaction sequence, and kinetic analysis

Pei, Guishang; Xiang, Junyi; Zhong, Dapeng; Li, Gang; Lv, Xuewei

doi:10.1016/j.powtec.2020.10.045

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…The other peak (529.80 eV) was attributed to O 1s. The binding energy difference D (O 1s–V 2p 3/2 ), which is the criterion for verifying the valence state of vanadium, was 19 eV for the CaMgV 2 O 7 powder, consistently with the values reported in the literature 22 . These results corroborated the presence of a single V 5+ ion in the CaMgV 2 O 7 sample.…”

Section: Resultssupporting

confidence: 89%

“…The binding energy difference D (O 1s-V 2p 3/2 ), which is the criterion for verifying the valence state of vanadium, was 19 eV for the CaMgV 2 O 7 powder, consistently with the values reported in the literature. 22 These results corroborated the presence of a single V 5+ ion in the CaMgV 2 O 7 sample. The high-resolution Mg 1s spectra in Figure 5D show only one peak of Mg 1s located at 1303.19 eV, indicating the presence of Mg 2+ .…”

Section: Crystal Structure and Surface Morphology Of Camgv 2 Osupporting

confidence: 70%

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Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

et al. 2022

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A double pyrovanadate CaMgV 2 O 7 sample was synthesized via a facile solidstate route under an air atmosphere. The nonequilibrium formation pathways of the CaMgV 2 O 7 were investigated via powder X-ray diffraction. A multistep reactions path (metavanadates-pyrovanadates-double pyrovanadate CaMgV 2 O 7 ) was proposed to describe the formation of the CaMgV 2 O 7 considering the thermodynamic and kinetic factors. The cell unit parameters of the CaMgV 2 O 7 sample indicated the crystallization according to a monoclinic system with space group P12/c1( 14), and the lattice parameters of a = 6.756 Å, b = 14.495 Å, c = 11.253 Å, β = 99.12, and V = 108.806 Å 3 . X-ray photoelectron spectroscopy also confirmed the +5 oxidation state vanadium in CaMgV 2 O 7 . The endothermic effects at 1033 and 1143 K were related to the incongruent melting and liquidus temperatures of CaMgV 2 O 7 , respectively. The comprehensive thermodynamic properties of CaMgV 2 O 7 were established in both low-and high-temperature regions, utilizing a physical property measurement system and multi-hightemperature calorimetry (96 lines). The heat capacity (200 J mol K −1 ) and entropy (198 J mol K −1 ) at 298.15 K were computed based on the low-temperature heat capacity values, and the enthalpy of formation at 298.15 K was also estimated. The fitted high-temperature capacity can be used to obtain the changes in the enthalpy, entropy, and Gibbs free energy. This study is part of building a reliable thermodynamic database of the CaO-MgO-V 2 O 5 system.

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Section: Resultssupporting

confidence: 89%

Section: Crystal Structure and Surface Morphology Of Camgv 2 Osupporting

confidence: 70%

Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

et al. 2022

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“…Binding energy difference D (O1s − V2p 3/2 ) is the criteria for verifying the valence state of V 34 . The D (O1s − V2p 3/2 ) of Ca 5 Mg 4 V 6 O 24 powder is equal to 19 eV, which is consistent with values reported in the literature 34 . The results can verify the presence of only V 5+ in the Ca 5 Mg 4 V 6 O 24 sample.…”

Section: Resultssupporting

confidence: 89%

“…However, the other peak at 529.80 eV can be attributed to O1s. Binding energy difference D (O1s − V2p 3/2 ) is the criteria for verifying the valence state of V 34 . The D (O1s − V2p 3/2 ) of Ca 5 Mg 4 V 6 O 24 powder is equal to 19 eV, which is consistent with values reported in the literature 34 .…”

Section: Resultssupporting

confidence: 88%

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

et al. 2022

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A Ca5Mg4V6O24 compound was synthesized through solid‐state roasting routes under an air atmosphere, and its crystal structure and thermodynamic properties were determined using various methods. The cell parameters of Ca5Mg4V6O24 indicate that it crystallizes in cubic space group Ia3d with the unit cell parameters a = 12.442 ± 0.001 Å. X‐ray photoelectron spectroscopy also confirmed that the vanadium element in the Ca5Mg4V6O24 sample is present in the +5 state. The melting of Ca5Mg4V6O24 was detected at 1442 K. The molar heat capacity (374 J mol K−1) and entropy (688.2 J mol K−1) of Ca5Mg4V6O24 at 298.15 K were determined using physical properties measurement system, and simultaneous thermal analyzer for the first time. The solubility of Ca5Mg4V6O24 in water at different temperatures was measured and its dissolution behavior in sulfuric acid and kinetics was experimentally established.

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“…As discussed in earlier sections, the amorphous AMV precursor transforms into various crystalline V 2 O 5 nanostructures. It has been observed previously that the V 2 O 5 can be transformed into multiple phases of VO x . − …”

Section: Resultsmentioning

confidence: 88%

Thermolysis-Driven Growth of Vanadium Oxide Nanostructures Revealed by In Situ Transmission Electron Microscopy: Implications for Battery Applications

Gavhane

Sontakke

Huis

2023

ACS Appl. Nano Mater.

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Understanding the growth modes of 2D transition-metal oxides through direct observation is of vital importance to tailor these materials to desired structures. Here, we demonstrate thermolysis-driven growth of 2D V2O5 nanostructures via in situ transmission electron microscopy (TEM). Various growth stages in the formation of 2D V2O5 nanostructures through thermal decomposition of a single solid-state NH4VO3 precursor are unveiled during the in situ TEM heating. Growth of orthorhombic V2O5 2D nanosheets and 1D nanobelts is observed in real time. The associated temperature ranges in thermolysis-driven growth of V2O5 nanostructures are optimized through in situ and ex situ heating. Also, the phase transformation of V2O5 to VO2 was revealed in real time by in situ TEM heating. The in situ thermolysis results were reproduced using ex situ heating, which offers opportunities for upscaling the growth of vanadium oxide-based materials. Our findings offer effective, general, and simple pathways to produce versatile 2D V2O5 nanostructures for a range of battery applications.

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Isothermal reduction of V2O5 powder using H2 as oxygen carrier: Thermodynamic evaluation, reaction sequence, and kinetic analysis

Cited by 10 publications

References 34 publications

Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

Thermolysis-Driven Growth of Vanadium Oxide Nanostructures Revealed by In Situ Transmission Electron Microscopy: Implications for Battery Applications

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Isothermal reduction of V2O5 powder using H2 as oxygen carrier: Thermodynamic evaluation, reaction sequence, and kinetic analysis

Cited by 10 publications

References 34 publications

Double pyrovanadates CaMgV2O7: Formation mechanism, phase structure, and thermodynamic properties

Double pyrovanadates CaMgV2O7: Formation mechanism, phase structure, and thermodynamic properties

The phase structure, thermodynamic properties, and dissolution behavior of Ca5Mg4V6O24

Thermolysis-Driven Growth of Vanadium Oxide Nanostructures Revealed by In Situ Transmission Electron Microscopy: Implications for Battery Applications

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Product

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About

Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

Double pyrovanadates CaMgV₂O₇: Formation mechanism, phase structure, and thermodynamic properties

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄