Emptying and filling a tunnel bronze

Marley, Peter M.; Abtew, Tesfaye A.; Farley, Katie E.; Horrocks, Gregory A.; Dennis, Robert V.; Zhang, Peihong; Banerjee, Sarbajit

doi:10.1039/c4sc03748k

Cited by 42 publications

(87 citation statements)

References 52 publications

(27 reference statements)

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“…It belongs to monoclinic space group C2/m with lattice constants of a = 10.07 Å, b = 3.60 Å, c = 15.2 Å, and β = 109.9° ( a = 11.7 Å, b = 3.62 Å, c = 8.84 Å, and β = 109.5°) . β′‐V 2 O 5 has been commonly labelled as ζ‐V 2 O 5 since the publication of a paper demonstrating its synthesis in a form of nanowires from β‐Ag 0.33 V 2 O 5 . Recent simulations predict the existence of two other phases: δ′‐V 2 O 5 (probably derived from δ‐K 0.5 V 2 O 5 or δ‐Sr 0.5 V 2 O 5 ) and ρ′‐V 2 O 5 .…”

Section: Vanadium Oxide Polymorphs: Structures and Raman Spectramentioning

confidence: 99%

A review of Raman spectroscopy of vanadium oxides

Shvets

Dikaya

Maksimova

et al. 2019

J Raman Spectroscopy

335

216

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This review summarizes Raman scattering data for different stable and metastable phases of vanadium oxides. We analyze literature data on crystal structures existing in the binary vanadium‐oxygen system. If available, we combine these data with experimental Raman spectra and relations of vibrational modes with the atomic arrangements and motions in crystals. Further, we employ arc sputtering to produce vanadium oxide films, including α and β‐vanadium, V14O6, VO, V2O3, V3O5, several phases of VO2, V6O13, V3O7, and V2O5, as confirmed by X‐ray diffraction analysis. All the films are studied using Raman spectroscopy: low‐ and high‐temperature V3O5 and VOx (1.67 < x < 2) are investigated for the first time. We demonstrate that a significant change in the V3O5 spectrum takes place along the phase transition occurring at approximately 140 °C. Moreover, we describe differences between the spectra of VO2 polymorphs produced without doping impurities, VO2 (M1), VO2 (M2), and VO2 (T). Finally, we analyze conflicting data on V7O16 and V3O7 and provide an explanation of the observed spectra. Overall, 21 spectra are identified for 53 known phases. Our work is aimed at laying the groundwork for easy identification of vanadium oxide phases in thin films, using Raman spectroscopy.

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Section: Vanadium Oxide Polymorphs: Structures and Raman Spectramentioning

confidence: 99%

A review of Raman spectroscopy of vanadium oxides

Shvets

Dikaya

Maksimova

et al. 2019

J Raman Spectroscopy

335

216

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“…Ternary vanadium oxide bronzes exhibit many unique structural and electronic properties . Their layered and tunnel structures facilitate the intercalation of a variety of cations, making them candidates for the next generation of Li‐ and multivalent‐ion battery cathodes . At the same time, this can lead to the creation of many unique V 2 O 5 bronzes (M x V 2 O 5 , M=Ca, Sr, K, Pb.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Their layered and tunnel structures facilitatet he intercalation of av ariety of cations, making them candidates for the next generation of Li-and multivalent-ion battery cathodes. [2,4,[5][6][7][8][9][10] At the same time, this can lead to the creation of many unique V 2 O 5 bronzes (M x V 2 O 5 , M = Ca, Sr,K ,P b. ), whiche xhibit multiple charge-ordered states, electronic correlation effects, and colossalm etal to insulator transitions.…”

Section: Introductionmentioning

confidence: 99%

Structure‐Induced Switching of the Band Gap, Charge Order, and Correlation Strength in Ternary Vanadium Oxide Bronzes

Tolhurst

Andrews

Leedahl

et al. 2017

Chemistry A European J

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Recently, V O nanowires have been synthesized as several different polymorphs, and as correlated bronzes with cations intercalated between the layers of edge- and corner- sharing VO octahedra. Unlike extended crystals, which tend to be plagued by substantial local variations in stoichiometry, nanowires of correlated bronzes exhibit precise charge ordering, thereby giving rise to pronounced electron correlation effects. These developments have greatly broadened the scope of research, and promise applications in several frontier electronic devices that make use of novel computing vectors. Here a study is presented of δ-Sr V O , expanded δ-Sr V O , exfoliated δ-Sr V O and δ-K V O using a combination of synchrotron soft X-ray spectroscopy and density functional theory calculations. The band gaps of each system are experimentally determined, and their calculated electronic structures are discussed from the perspective of the measured spectra. Band gaps ranging from 0.66 ± 0.20 to 2.32 ± 0.20 eV are found, and linked to the underlying structure of each material. This demonstrates that the band gap of V O can be tuned across a large portion of the range of greatest interest for device applications. The potential for metal-insulator transitions, tuneable electron correlations and charge ordering in these systems is discussed within the framework of our measurements and calculations, while highlighting the structure-property relationships that underpin them.

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“…It is well known that the catalytic performance in the partial oxidation of H2S of metal-containing vanadium oxide bronzes strongly depends on the preparation procedure [12,13]. In the case of Na-promoted materials, it has been previously reported that mixtures of NaV6O15 and V2O5, containing 35 %, 66 % and 88 % of vanadium oxide bronze (determined by Rietveld from the XRD patterns) were achieved using Na/V ratios in the synthesis gel of 0.09, 0.17 and 0.33, respectively.…”

Section: General Remarksmentioning

confidence: 99%

“…Among them, Ag-containing vanadium oxide bronze has been extensively studied paying special attention their synthesis and characterization [13][14][15], but little is known about their catalytic properties [16,17]. In addition, the incorporation of divalent metals such as Ca or Cu could be of interest in order to modify physico-chemical properties of vanadium oxide bronzes.…”

Section: Introductionmentioning

confidence: 99%

Partial oxidation of hydrogen sulfide to sulfur over vanadium oxides bronzes

et al. 2016

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V NMR results, Ag0.35V2O5 and Na0.33V2O5 (or NaV6O15) bronzes with a minority presence of V2O5 were mainly obtained in the case of Ag-and Na-containing materials in samples both heat-treated in air or in N2 atmosphere. In the case of Cu-and Ca-containing samples, V2O5 was mainly observed in samples calcined in air.However, Cu0.26V2O5 and Ca0.17V2O5 bronzes, with the minority presence of V2O5, have been observed in Cu-and Ca-containing samples heat-treated in N2. On the other hand, the catalytic behavior strongly depends on the metal promoter. Thus catalysts presenting vanadium oxide bronzes, i.e. samples presenting Ag0.35V2O5, NaV6O15, Cu0.26V2O5 or Ca0.17V2O5 shows a catalytic activity during the partial oxidation of H2S to sulfur higher than that observed over pure V2O5 or over promoted catalysts presenting mainly V2O5 (i.e. Cu-or Ca-containing samples calcined in air). Moreover, some differences in the selectivity to sulfur were observed. A higher formation of SO2 at high reaction temperature has been favored over Ag0.35V2O5 -containing catalyst. This different behavior between samples could be explained by the presence of metallic Ag on the surface of Ag0.35V2O5, which was detected by XRD. Also, higher formation of SO2 is favored in the case of catalyst heat-treated in N2, in which the presence of VO2, as minority, could have a role in combustion of sulfur. Accordingly, this work should be considered as a first approach to relate catalytic activity of the Me-containing vanadium 3 oxide bronze (containing Ag, Cu, Ca and Na) for the selective oxidation of hydrogen sulfide.Keywords: Ag0.35V2O5, NaV6O15, Ca0.17V2O5 bronzes; selective oxidation of hydrogen sulfide to sulfur; Na-, Ag-, Ca-or Cu-doped catalysts, vanadium oxide bronze.

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Emptying and filling a tunnel bronze

Abstract: We report the synthesis of a new tunnel-structured polymorph of V2O5 (ζ-V2O5) synthesized by topotactic ion extraction.

Cited by 42 publications

References 52 publications

A review of Raman spectroscopy of vanadium oxides

A review of Raman spectroscopy of vanadium oxides

Structure‐Induced Switching of the Band Gap, Charge Order, and Correlation Strength in Ternary Vanadium Oxide Bronzes

Partial oxidation of hydrogen sulfide to sulfur over vanadium oxides bronzes

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