Influence of water expulsion on structural properties of V[sub 2]O[sub 5]nH[sub 2]O sol-gel films

Gökdemir, F. Pınar; Menda, U. Deneb; Kavak, Pelin; Saatci, A. Evrim; Özdemi̇r, Orhan; Kutlu, Kubilay

doi:10.1063/1.4751611

Cited by 5 publications

(4 citation statements)

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“…TGA was conducted to determine the ratio of water molecules in hydrated V 2 O 5 , as shown in Figure S1. Similar to literature data, the TGA plot shows three weight loss stages, corresponding to three types of bound water molecules [19,23]. From 30 to 120 • C, the weight loss is generally attributed to weakly bound water molecules.…”

Section: Resultssupporting

confidence: 82%

“…. The interlayer of the (001) plane (d 001 = 12.3 Å) indicates that the number of crystalline water molecules in the hydrated V 2 O 5 •nH 2 O is close to 1.9 according to the Van der Waals diameter of the water molecule (2.7 Å) [19]. TGA was conducted to determine the ratio of water molecules in hydrated V 2 O 5 , as shown in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

“…From 30 to 120 • C, the weight loss is generally attributed to weakly bound water molecules. The weight loss between 120 and 280 • C comes from departure of more strongly bound water molecules, and complete water molecules are removed when hydrated V 2 O 5 is heated to 400 • C, along with a total weight loss of 15.4%, corresponding to 1.8 moles of [19,23]. The XPS spectra (Figure 2b) present four peaks, in which the two major ones, located at the binding energies of 517.6 eV (V 2p 3/2 ) and 525.0 eV (V 2p 1/2 ), correspond to the spin-orbit peaks of the V-O bond from V 5+ in the hydrated V 2 O 5 and the other two, minor ones, are attributed to the spin-orbit peaks of V-O bond from V 4+ [23,28].…”

Section: Resultsmentioning

confidence: 99%

“…Several cathode materials have been successfully synthesized, such as MnO 2 , Prussian blue analogues, Na 3 V 2 P(O4) 3 , and vanadium-based compounds [11][12][13][14][15][16][17][18]. Among them, V 2 O 5 •nH 2 O (hydrated V 2 O 5 ) is one of the most promising cathode materials due to unique intrinsic properties, including multiple stable valences; a bilayer structure; adjustable interlayer space, between 8.8 and 17.2 Å (corresponding n between 0.5 and 6); and one of the highest theoretical capacities, of 510 mAh/g (when n = 1.6), for discovered ZIB cathode materials [19,20]. The substantial interlayer space and crystalline water endow it with excellent zinc ion storage capability [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Facile and Rapid Synthesis of Porous Hydrated V2O5 Nanoflakes for High-Performance Zinc Ion Battery Applications

et al. 2022

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Hydrated V2O5 with unique physical and chemical characteristics has been widely used in various function devices, including solar cells, catalysts, electrochromic windows, supercapacitors, and batteries. Recently, it has attracted extensive attention because of the enormous potential for the high-performance aqueous zinc ion battery cathode. Although great progress has been made in developing applications of hydrated V2O5, little research focuses on improving current synthesis methods, which have disadvantages of massive energy consumption, tedious reaction time, and/or low efficiency. Herein, an improved synthesis method is developed for hydrated V2O5 nanoflakes according to the phenomenon that the reactions between V2O5 and peroxide can be dramatically accelerated with low-temperature heating. Porous hydrated V2O5 nanoflake gel was obtained from cheap raw materials at 40 °C in 30 min. It shows a high specific capacity, of 346.6 mAh/g, at 0.1 A/g; retains 55.2% of that at 20 A/g; and retains a specific capacity of 221.0 mAh/g after 1800 charging/discharging cycles at 1 A/g as an aqueous zinc ion battery cathode material. This work provides a highly facile and rapid synthesis method for hydrated V2O5, which may favor its applications in energy storage and other functional devices.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile and Rapid Synthesis of Porous Hydrated V2O5 Nanoflakes for High-Performance Zinc Ion Battery Applications

et al. 2022

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Comparison of Structural and Electrochemical Properties of V2O5 Thin Films Prepared by Organic/Inorganic Precursors

Gökdemir

Özdemi̇r

Kutlu

2014

Electrochimica Acta

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Study of the structural, thermal, optical, electrical and nanomechanical properties of sputtered vanadium oxide smart thin films

et al. 2015

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Vanadium oxide thin films were grown on both quartz and Si(111) substrates utilizing pulsed RF magnetron sputtering technique at room temperature with RF power at 100 W to 700 W. The corresponding thicknesses of the films were increased from 27.5 nm to 243 nm and 21 nm to 211 nm as RF power increased from 100 W to 700 W for quartz and silicon substrates, respectively. X-ray diffraction and field emission scanning electron microscopy were carried out to investigate the phase and surface morphology of the deposited films. Electronic structure and vanadium oxidation states of the deposited films were investigated thoroughly by X-ray photoelectron spectroscopy. As-grown films show stoichiometric vanadium oxide only where vanadium is in V 5+ and V 4+ states. Phase transition of vanadium oxide films were investigated by differential scanning calorimetric technique. The reversible i.e. smart transition was observed in the region from 337 °C to 343 °C. Average hemispherical emittance of the deposited vanadium oxide films was evaluated by an emissometer in the wavelength range of 3 µm to 30 µm. The sheet resistance of the deposited films was measured by two-probe method and data were in the range of 10 6 to 10 5 Ω/square. Optical properties of the films such as solar transmittance, solar reflectance and solar absorptance as well as optical constants e.g. optical band gap were also evaluated. Finally, mechanical properties such as nanohardness and Young's modulus at microstructural length scale were evaluated employing nanoindentation technique with continuous stiffness mode.

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Influence of water expulsion on structural properties of V[sub 2]O[sub 5]nH[sub 2]O sol-gel films

Cited by 5 publications

References 3 publications

Facile and Rapid Synthesis of Porous Hydrated V2O5 Nanoflakes for High-Performance Zinc Ion Battery Applications

Facile and Rapid Synthesis of Porous Hydrated V2O5 Nanoflakes for High-Performance Zinc Ion Battery Applications

Comparison of Structural and Electrochemical Properties of V2O5 Thin Films Prepared by Organic/Inorganic Precursors

Study of the structural, thermal, optical, electrical and nanomechanical properties of sputtered vanadium oxide smart thin films

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