Effect of Mo Doping and Heat Treatment on Microstructure and Electrochemical Performance of Vanadium Oxide Nanotubes

2003 ◽  
Vol 788 ◽  
Author(s):  
Liqiang Mai ◽  
Wen Chen ◽  
Congsheng Jiang ◽  
Qing Xu ◽  
Junfeng Peng ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Vanadium Oxide ◽  
Ionic Radius ◽  
Diffusion Length ◽  
Inert Atmosphere ◽  
Phase Reaction ◽  
Organic Template ◽  
Electrochemical Investigation ◽  
Self Assembling ◽  
Vanadium Oxide Nanotubes

ABSTRACTMo doped vanadium oxide nanotubes (VONT) were formed via a rheological phase reaction followed by self-assembling process and were heated at 400 □ in an inert atmosphere. The nanotubes were characterized by SEM, HRTEM, XRD, FTIR, electrochemical investigation, etc. In contrast to the undoped VONTs, the interlayer distance between oxide layers in the (V0.99Mo0.01)xONTs increases owing to replacement of some V in nanotubes by Mo with a larger ionic radius, resulting in a shorten diffusion length of Li ions and an improved electrochemical performance. The electrochemical performance of (V0.99Mo0.01)xONTs is further enhanced by removing the residual organic template by heating in an inert atmosphere.

SYNTHESIS AND ELECTROCHEMICAL PERFORMANCE OF COPPER DOPED VANADIUM OXIDE NANOTUBES

2004 ◽  
pp. 455-459
Author(s):  
W. CHEN ◽  
L. Q. MAI ◽  
Q. XU ◽  
J. F. PENG ◽  
H. YU ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Vanadium Oxide ◽  
Vanadium Oxide Nanotubes

Vanadium Oxide Nanotubes: Characterization and Electrochemical Behavior

2001 ◽  
Vol 703 ◽  
Author(s):  
Samuel T. Lutta ◽  
Arthur Dobley ◽  
Katana Ngala ◽  
Shoufeng Yang ◽  
Peter Y. Zavalij ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Sol Gel ◽  
Interlayer Spacing ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Ion Exchange Reaction ◽  
Transmission Electron ◽  
Redox Active ◽  
Vanadium Oxide Nanotubes ◽  
Tubular Morphology

ABSTRACTVanadium oxide nanotubes (VONT) were formed from vanadium (V) oxide and the dodecylamine templating agent by a sol-gel reaction and subsequent hydrothermal treatment. The nanotubes were characterized by transmission electron microscopy (TEM), electron diffraction, thermogravimetric analysis (TGA), infrared spectroscopy and powder X-ray diffraction (XRD). The nanotubes consist of VO2.4[C12H28N] 0.27 and range in diameter from 100 nm to150 nm. The study further reveals that the compound maintained the tubular morphology when heated at 430o C in an inert atmosphere. However, the tubular morphology is destroyed when the compound is heated at about 130°C in oxygen. Organic free manganese intercalated vanadium oxide nanotubes (MnVONT) were synthesized by an ion exchange reaction. The previously mentioned techniques were used to characterize MnVONT. Mn0.86V7O16+δ. nH2O layers have 2D tetragonal cell with a=6.157(3) Å, while interlayer spacing is 10.52 (3) Å. VONT, heated VONT and Mn0.86V7O16+δ. nH2O are redox - active and can insert lithium reversibly. This study reveals that the electrochemical performance of VONT is enhanced by removing the organic template by heating in an inert atmosphere or exchanging with Mn2+ ions.

Self-assembling synthesis of vanadium oxide nanotubes and simple determination of the content of V(IV)

2003 ◽  
Vol 18 (4) ◽  
pp. 21-23
Author(s):  
Mai Li-qiang ◽  
Chen Wen ◽  
Xu Qing ◽  
Zhu Quan-yao ◽  
Han Chun-hua ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Self Assembling ◽  
Vanadium Oxide Nanotubes

The Structure and Electrochemical Performance of Na[sup +]-, K[sup +]-, and Ca[sup 2+]-Vanadium Oxide Nanotubes

2003 ◽  
Vol 150 (5) ◽  
pp. E280 ◽  
Author(s):  
Sara Nordlinder ◽  
Jan Lindgren ◽  
Torbjörn Gustafsson ◽  
Kristina Edström
Keyword(s):  
Electrochemical Performance ◽  
Vanadium Oxide ◽  
Vanadium Oxide Nanotubes

Self-Assembling Vanadium Oxide Nanotubes by Organic Molecular Templates

2002 ◽  
Vol 41 (17) ◽  
pp. 4524-4530 ◽  
Author(s):  
Xing Chen ◽  
Xiaoming Sun ◽  
Yadong Li
Keyword(s):  
Vanadium Oxide ◽  
Self Assembling ◽  
Vanadium Oxide Nanotubes

Effects of Ni Doping on the Initial Electrochemical Performance of Vanadium Oxide Nanotubes for Na-Ion Batteries

2014 ◽  
Vol 6 (14) ◽  
pp. 11692-11697 ◽  
Author(s):  
Hyunjin Kim ◽  
Ryoung-Hee Kim ◽  
Seok-Soo Lee ◽  
Yongsu Kim ◽  
Dong Young Kim ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Vanadium Oxide ◽  
Ni Doping ◽  
Vanadium Oxide Nanotubes

V2O5 Nanotubes Novel Gas Sensor with High Sensitivity for Ethanol

2009 ◽  
Vol 421-422 ◽  
pp. 328-331 ◽  
Author(s):  
Wei Jin ◽  
Wen Chen ◽  
Bai Tao Dong ◽  
Chun Xia Zhao ◽  
Li Qiang Mai ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
High Sensitivity ◽  
Average Diameter ◽  
Self Assembling ◽  
Gas Sensing Properties ◽  
Vanadium Oxide Nanotubes

Vanadium oxide nanotubes were synthesized via a rheological self-assembling process followed by a hydrothermal reaction. V2O5 gas sensors were fabricated from vanadium oxide nanotubess with an average diameter of around 90 nm and their gas-sensing properties were investigated. It was found that the sensors based on vanadium oxide nanotubes exhibit high responses ethanol gas at 270°C. The results indicate that vanadium oxide nanotube sensors will be promising candidates for practical detectors for ethanol.

Synthesis of Novel Vanadium Oxide Nanotubes and Nanofibers

2002 ◽  
Vol 740 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Vanadium Oxide ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Organic Polymer ◽  
Fibrous Morphology ◽  
Surfactant Templates ◽  
Vanadium Oxide Nanotubes

ABSTRACTWe are exploring the synthesis and properties of structured vanadium oxides mainly nanotubes and nanorods. Nanotubes initially formed with surfactant templates have been readily exchanged with simple cations without change of the basal-plane structure. These compounds contain d-like vanadium oxide layers with the vanadium in VO6 octahedra. This structure is particularly suitable for redox reactions. In this paper we report on synthesis of vanadium oxide, (NH4)xV2O5-d·nH2O rods using organic polymer as template. This compound has been synthesized by sol-gel reaction and subsequent hydrothermal treatment. TGA, SEM, XRD and FTIR were used to characterize this compound. Thermal analysis of this compound shows that the fibrous morphology is maintained when it is heated in nitrogen and oxygen above 300 °C. However, in both cases the size of the fibers decreases. Performance of this compound as cathode material in secondary electrolyte has been investigated using LiPF6 as electrolyte. A capacity of 140 mAh/g was obtained which remained fairly constant with up to at least 10 cycles. We also investigated electrochemical behavior of thermal products.

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