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Title: Vanadium oxides nanostructures: Hydrothermal synthesis and electrochemical properties

Highlights: • Vanadium oxides nanostructures were synthesized hydrothermally. • Reversible redox behavior with doping/dedoping process. • Doping/dedoping is easier for Li{sup +} to Na{sup +}. • Energy-related applications such as cathodes in lithium batteries. - Abstract: A facile and template-free one-pot strategy is applied to synthesize nanostructured vanadium oxide particles via a hydrothermal methodology. X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transforms infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) have been used to characterize the structure and morphology of the samples. The products are gradually changed from sheet-shaped VO{sub 2}(B) to rod-like V{sub 3}O{sub 7}·H{sub 2}O with decreasing cyclohexanediol as both protective and reducing agent. The specific surface area of the VO{sub 2}(B) nanosheets and V{sub 3}O{sub 7}·H{sub 2}O nanorods was found to be 22 and 16 m{sup 2} g{sup −1}, respectively. Thin films of VO{sub 2}(B) and V{sub 3}O{sub 7}·H{sub 2}O deposited on ITO substrates were electrochemically characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The voltammograms show reversible redox behavior with doping/dedoping process corresponding to reversible cation intercalation/de-intercalation into the crystal lattice of the nanorods/nanosheets. This process is easier for the small Li{sup +} cation than larger ones Na{sup +}.
Authors:
;  [1] ;  [1] ;  [2]
  1. Laboratory of Condensed Matter Chemistry, IPEIT, University of Tunis, 2 Jawaher Lel Nehru 1008, B. P. 229 Montfleury (Tunisia)
  2. (Tunisia)
Publication Date:
OSTI Identifier:
22420656
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CLATHRATES; CRYSTAL LATTICES; ELECTROCHEMISTRY; FOURIER TRANSFORMATION; HYDROTHERMAL SYNTHESIS; IMPEDANCE; INFRARED SPECTRA; LITHIUM IONS; MORPHOLOGY; NANOSTRUCTURES; SCANNING ELECTRON MICROSCOPY; SODIUM IONS; SPECIFIC SURFACE AREA; SUBSTRATES; THIN FILMS; VANADIUM OXIDES; VOLTAMETRY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY