Surfactant-Assisted Hydrothermal Growth of Single-Crystalline Ultrahigh-Aspect-Ratio Vanadium Oxide Nanobelts

Abstract

Single-crystalline vanadium oxide nanobelts were obtained through a surfactant-directed growth process under hydrothermal conditions using V 2 O 5 as a precursor. The shape and size were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), ultraviolet/ visible (UV/vis) spectroscopy, X-ray photoelecton spectroscopy (XPS), high-resolution TEM (HRTEM), and selected area electron diffraction (SAED) were used to characterize the composition and structure of the as-prepared nanobelts. The as-obtained vanadium oxide nanobelts are up to several hundreds of micrometers in length, 100-200 nm in diameter, and 20-30 nm in thickness. A possible mechanism was proposed to account for the formation of the nanobelts. The influence of the concentration of reactants, the reaction time, the concentration of the surfactant, and the reaction temperature on the morphology of the resulting products are discussed in detail. Furthermore, we tested the electrochemical intercalation properties with Li + of the postannealing sample by calcining the obtained vanadium oxide nanobelts at 400 °C. It was found that the morphology and the structure of the synthesized product had an important influence on the electrochemical intercalation properties.

Centimeter‐Long V2O5 Nanowires: From Synthesis to Field‐Emission, Electrochemical, Electrical Transport, and Photoconductive Properties

“…However, a capacity of 175 mAh g À1 can still be remained even after 20 cycles of charge/discharge. This is superior to that reported by Shi et al [35] (150 mAh g À1 after 18 cycles) and Li et al [10] (lower than 120 mAh g À1 after 20 cycles). The Coulombic efficiency, calculated by dividing the charge capacity by discharge capacity, increased rapidly from 86% for the first cycle to 97% for the second one.…”

“…[33,34] The initial discharge capacity of the V 2 O 5 nanowires is as high as 351 mAh g À1 , much higher than that reported by other groups for other V 2 O 5 nanostructures. [6,7,33,35] The higher capacity of the present nanomaterial may be ascribed to their larger specific surface area. The cycle performance of a fabricated cell is shown in Figure 4b.…”

Facile hydrothermal synthesis of vanadium oxides nanobelts by ethanol reduction of peroxovanadium complexes

“…and their derivatives have attracted increasing attention because they can be used as the electrode materials for electrochemical applications in recent years. As the intercalation compounds, V 3 O 7 Á H 2 O and VO 2 (B) are promising cathode materials in lithium-ion batteries [20,23,24,26,[55][56][57]. It was reported that the electrochemical properties of the electrode materials were influenced by many factors, such as intrinsic structure, morphology, and preparation methods.…”

“…A small drop in the discharge capacity might be explained two following reasons: (1) [24]; (2) The decrease of discharge capacity of the sample is likely due to partial fracture of its shape and structural degradation after the redox cycle. That has been studied during the charge-discharge process of vanadium oxides nanostructures [23,26,60]. In the case of VO 2 (B) nanobelts, they exhibit an initial discharge capacity of 190 mAh/g.…”

Synthesis of single crystalline (NH4)2V6O16·1.5H2O nest-like structures

“…Over the past few years, considerable attention has been devoted to the synthesis of one-dimensional (1D) nanostructured materials such as nanotubes, nanorods, nanowires and nanobelts, because of their novel physical and chemical properties [1][2][3]. Among various metal oxide nanostructures, one-dimensional vanadium oxide-based nanostructured materials have interested many researchers over the last few decades due to their outstanding structural flexibility [4], diverse technological applications in catalysis [5,6], rechargeable lithium ion batteries [7], chemical sensors or actuators [8,9], electrochemical pseudo-capacitors [10] and electro-chromic coatings [11].…”