V<sub>6</sub>O<sub>13</sub>films by control of the oxidation state from aqueous precursor to crystalline phase

Peys, Nick; Ling, Yun; Dewulf, Daan; Gielis, Sven; Dobbelaere, Christopher De; Cuypers, Daniel; Adriaensens, Peter; Doorslaer, Sabine Van; Gendt, Stefan De; Hardy, An; Bael, Marlies K. Van

doi:10.1039/c2dt31857a

Cited by 25 publications

(29 citation statements)

References 40 publications

(57 reference statements)

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“…Without EG, large amount of yellowish spongy precipitations were obtained. 24 The black precipitations are wide nanobelts, with width of up to 800 nm and length of several micrometers, which severely agglomerate and coalesce together (Fig. 7a).…”

Section: Resultsmentioning

confidence: 99%

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Wei

Wang

et al. 2015

J. Mater. Chem. A

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ARTICLE This journal isNovel hierarchical vanadium oxide microspheres forming from hyperbranched growth of nanoribbons have been successfully synthesized by solvothermal method. The as-prepared hierarchical microspheres are in diameter of ~5 μm, in which ~400 nm long nanoribbons grow hyperbranchingly on the clustering nanobelt backbones. These hierarchical microspheres contain 86.2 mass% V 6 O 13 with metallic conductivity and 13.8 mass% VO 2 . Investigation of growth mechanism indicates that EG plays an important role in the formation of hierarchical microspheres by regulating the solvent polar ity and vanadium valences. The hierarchical microspheres exhibit a specific capacitance as remarkably high as 456 F/g, with corresponding volumetric specific capacitance of 3.09 F/cm 3 , at 0.6 A/g in the potential range of 0 to 1.2 V. The maximal energy density and power density achieved are up to 22.8 Wh/kg (0.16 mWh/cm 3 ) and 1.2 kW/kg (8.14 mW/cm 3 ). The high performance of hierarchical vanadium oxide microspheres can be ascribed to the high specific surface area and large amount of mesopores provided by the hierarchical architecture, and the high conductivity and density of V 6 O 13 in high content in the hierarchical microspheres. This work has provided a new strategy to increase the specific capacitance of transition-metal oxides as electrode materials for the next-generation supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Wei

Wang

et al. 2015

J. Mater. Chem. A

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“…Because, the actual vanadium oxide phase formation will occur in a low pO 2 atmosphere, 23 the thermal decomposition pathway of both precursor gels is studied in N 2 . Fig.…”

Section: Thermal Decompositionmentioning

confidence: 99%

Aqueous citrato-oxovanadate(iv) precursor solutions for VO₂: synthesis, spectroscopic investigation and thermal analysis

et al. 2014

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An aqueous precursor solution, containing citrato-VO(2+) complexes, is synthesized for the formation of monoclinic VO2. With regard to the decomposition of the VO(2+) complexes towards vanadium oxide formation, it is important to gain insights into the chemical structure and transformations of the precursor during synthesis and thermal treatment. Hence, the conversion of the cyclic [V4O12](4-) ion to the VO(2+) ion in aqueous solution, using oxalic acid as an acidifier and a reducing agent, is studied by (51)Vanadium nuclear magnetic resonance spectroscopy. The citrate complexation of this VO(2+) ion and the differentiation between a solution containing citrato-oxalato-VO(2+) and citrato-VO(2+) complexes are studied by electron paramagnetic resonance and Fourier transform infra-red spectroscopy. In both solutions, the VO(2+) containing complex is mononuclear and has a distorted octahedral geometry with a fourfold R-CO2(-) ligation at the equatorial positions and likely a fifth R-CO2(-) ligation at the axial position. Small differences in the thermal decomposition pathway between the gel containing citrato-oxalato-VO(2+) complexes and the oxalate-free gel containing citrato-VO(2+) complexes are observed between 150 and 200 °C in air and are assigned to the presence of (NH4)2C2O4 in the citrato-oxalato-VO(2+) solution. Both precursor solutions are successfully used for the formation of crystalline vanadium oxide nanostructures on SiO2, after thermal annealing at 500 °C in a 0.1% O2 atmosphere. However, the citrato-oxalato-VO(2+) and the oxalate-free citrato-VO(2+) solution result in the formation of monoclinic V6O13 and monoclinic VO2, respectively.

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“…The family of layered vanadium oxides, also known as Wadsley phases, includes VO 3 , V 2 O 5 , V 3 O 7 , V 4 O 9 , and V 6 O 13 which correspond to a general formula V n O 2 n +1 with n = 1–6, and where vanadium features a mixed 4–5 oxidation state. These compounds permit reversible ions intercalation which makes them suitable for electrochemical energy conversion and storage . Katzke et al have provided a unified structural description for this homologous series emphasizing the symmetry‐breaking mechanism, and considering the metastable monoclinic VO 2 (C2/m) as the end compound.…”

Section: Structure‐composition‐properties Interplaymentioning

confidence: 99%

“…Layered vanadium oxides have been intensively investigated as materials for energy storage. Monoclinic VO 2 and the layered V 2 O 5 , V 3 O 7 , V 4 O 9 , and V 6 O 13 were involved for the fabrication of cathodes for lithium‐ion batteries. VO 2 was found to exhibit a colossal change of the capacitance near the insulator‐to‐metal transition .…”

Section: Introductionmentioning

confidence: 99%

Vanadium Oxide Compounds: Structure, Properties, and Growth from the Gas Phase

Bahlawane¹,

Lenoble²

2014

Chemical Vapor Deposition

154

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The structure‐driven properties of vanadium oxide have inspired enormous developments in the last decades, especially as a smart material for energy, sensors, and optoelectronics. The large variety of stable and metastable structures of vanadium oxide is discussed, based on the calculated formation energies and a broad overview of their structure‐related properties. The established chemical deposition processes from the gas phase are reviewed with a particular emphasis on the implemented precursors and the obtained vanadium oxide phases. Although a significant fraction of relevant vanadium oxide compounds is achieved by these methods, there are still rewarding challenges related to their controlled elaboration and the investigation of their responsive properties.

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V₆O₁₃films by control of the oxidation state from aqueous precursor to crystalline phase

Cited by 25 publications

References 40 publications

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Aqueous citrato-oxovanadate(iv) precursor solutions for VO₂: synthesis, spectroscopic investigation and thermal analysis

Vanadium Oxide Compounds: Structure, Properties, and Growth from the Gas Phase

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V6O13films by control of the oxidation state from aqueous precursor to crystalline phase

Cited by 25 publications

References 40 publications

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Hierarchical vanadium oxide microspheres forming from hyperbranched nanoribbons as remarkably high performance electrode materials for supercapacitors

Aqueous citrato-oxovanadate(iv) precursor solutions for VO2: synthesis, spectroscopic investigation and thermal analysis

Vanadium Oxide Compounds: Structure, Properties, and Growth from the Gas Phase

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V₆O₁₃films by control of the oxidation state from aqueous precursor to crystalline phase

Aqueous citrato-oxovanadate(iv) precursor solutions for VO₂: synthesis, spectroscopic investigation and thermal analysis