Redox-Active Nanotubes of Vanadium Oxide

Spahr, Michael E.; Bitterli, Petra; Nesper, Reinhard; Müller, Martin; Krumeich, Frank; Nissen, H.‐U.

doi:10.1002/(sici)1521-3773(19980518)37:9<1263::aid-anie1263>3.3.co;2-i

Cited by 153 publications

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“…In other cases the multiwalled nanotube consists of several concentric "single-walled" nanotubes. 2,19,20 In this paper we develop a model for the energy and shape of concentric, multiwalled nanotubes, but the main ideas can likely also be applied to nanoscrolls.…”

Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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Multiwalled inorganic nanotubes with circular cross sections must have either an incoherent interface or a large amount of strain. However, nanotubes with a polygonal cross section can have a coherent interface with considerably less strain. We present a model for polygonal nanotubes with no defects where the chirality of the nanotube determines the shape of the cross section. Circular and polygonal nanotubes are compared based on their strain energy and interfacial energy. We have used first-principles calcuations to parameterize strain and interfacial energy for TiS 2 nanotubes. These calculations show that the polygonal model is energetically favorable to the circular model when the inner radius is above a critical radius, 6.2 Å for a TiS 2 nanotube with ten layers. These results should provide insight into further investigations of nanotube structure and allow computational studies to more accurately predict nanotube properties.

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Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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“…Soft chemical processes to prepare low-dimensional nanostructured materials have been attracting much attention. Nanotubes of bismuth [3], titania [4,5] and vanadium oxides [6], and nanowires of compound NaFe 4 P 12 [7] have been synthesized hydrothermally at low-temperature. In this communication we report the formation of titanium oxide nanoribbons by a hydrothermal soft chemical process.…”

Section: Introductionmentioning

confidence: 99%

Titanium oxide nanoribbons

Yuan

Colomer

2002

Chemical Physics Letters

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“…The vanadium oxide nanotubes were prepared as described by Krumeich et al [18,40] at the Department of Materials Chemistry (Ångström laboratory). A series of cycled electrodes were prepared to be discharged to different potentials (3.0 V, 2.5 V, 2.0 V and 1.8 V) to achieve different doping levels/lithium content.…”

Section: Vanadium Nanotubesmentioning

confidence: 99%

Soft X-ray emission spectroscopy of liquids and lithium batterymaterials

Augustsson

2004

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Lithium ion insertion into electrode materials is commonly used in rechargeable battery technology. The insertion implies changes in both the crystal structure and the electronic structure of the electrode material. Side-reactions may occur on the surface of the electrode which is exposed to the electrolyte and form a solid electrolyte interface (SEI). The understanding of these processes is of great importance for improving battery performance. The chemical and physical properties of water and alcohols are complicated by the presence of strong hydrogen bonding. Various experimental techniques have been used to study geometrical structures and different models have been proposed to view the details of how these liquids are geometrically organized by hydrogen bonding. However, very little is known about the electronic structure of these liquids, mainly due to the lack of suitable experimental tools. In this thesis examples of studies of lithium battery electrodes and liquid systems using soft x-ray emission spectroscopy will be presented. Monochromatized synchrotron radiation has been used to accomplish selective excitation, in terms of energy and polarization. The electronic structure of graphite electrodes has been studied, before and after lithium intercalation. Changes in the electronic structure upon lithiation due to transfer of electrons into the graphite π-bands have been observed. Transfer of electrons in to the 3d states of transition metal oxides upon lithiation have been studied, through low energy excitations as dd-and charge transfer-exciations. A SEI was detected on cycled graphite electrodes. By the use of selective excitation different carbon sites were probed in the SEI. The local electronic structure of water, methanol and mixtures of the two have been examined using a special liquid cell, to separate the liquid from the vacuum in the experimental chamber. Results from the study of liquid water showed a strong influence on the 3a1 molecular orbital and orbital mixing between water molecules upon hydrogen bonding. Apart from the four-hydrogen-bonding structure in water, a structure where one hydrogen bond is broken could be separated and identified. The soft x-ray emission study of methanol showed the existence of ring and chain formations in the liquid phase and the dominating structures are formed of 6 and 8 molecules. Upon mixing of the two liquids, a segregation at the molecular level was found and the formation of new structures, which could explain the unexpected low increase of the entropy. Reprints were made with permission from the publisher. 7The following articles have been omitted from the thesis. They were omitted either due to the character of the material, or due to the limited extent of my contribution.• Bandlike and excitonic states of oxygen in CuGeO 3 : Observation using polarized resonant soft x-ray emission spectroscopy L. • Electronic structure studies of V 6 O 13 by soft X-ray emission spectroscopy: band-like and excitonic vanadium states

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Redox-Active Nanotubes of Vanadium Oxide

Cited by 153 publications

References 0 publications

Polygonal model for layered inorganic nanotubes

Polygonal model for layered inorganic nanotubes

Titanium oxide nanoribbons

Soft X-ray emission spectroscopy of liquids and lithium batterymaterials

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