Synthesis and Electrochemical Properties of Vanadium Pentoxide Nanotube Arrays

Abstract

Nanotube arrays of amorphous vanadium pentoxide (V(2)O(5)) were synthesized via template-based electrodeposition, and its electrochemical properties were investigated for Li-ion intercalation applications. The nanotubes have a length of 10 microm, outer diameter of 200 nm and inner diameter of 100 nm. Electrochemical analyses demonstrate that the V(2)O(5) nanotube array delivers a high initial capacity of 300 mAh/g, about twice that of the electrochemically prepared V(2)O(5) film. Although the V(2)O(5) nanotube array shows a more drastic degradation than the film under electrochemical redox cycles, the nanotube array reaches a stabilized capacity of 160 mAh/g, which remains about 1.3 times the stabilized capacity of the film.

Annealing effects on V2O5-x thin films deposited by non reactive sputtering

“…It is a promising compound for smart window applications, but the intercalation process is slow because of its low electrical conductivity and diffusion coefficient of ions [2][3][4][5][6][7]. Nanoparticle V 2 O 5 thin films are used to overcome this issue by increasing the surface area and decreasing the diffusion distance [8]. In our study, the experimental details for preparing sputtered V 2 O 5−x thin films and the effect of annealing over the prepared thin films were discussed.…”

Carbon nanocage supported synthesis of V2O5 nanorods and V2O5/TiO2 nanocomposites for Li-ion batteries

“…10, 5,11,12 Although a third Li + insertion is possible (2.0 ≤ x ≤ 3.0), its arrival effects an irreversible structural change to a cubic ω-V 2 O 5 phase, having a typical rock-salt structure. Whilst the rock-salt structure 45 minimises internal electrostatic interactions, 8 electrochemical cycling of the ω-phase is often only considered for values of x between 0.4 ≤ x ≤ 3.0 as a result of its unfavourable crystal orientation. 13 Although the capacity of V 2 O 5 cathodes are known to 50 approach theoretical limits during early stages of cycling, capacity fading as a result of continued Li + trapping is known to be problematic.…”

“…16 [36][37][38][39][40] and hard/soft templating. [41][42][43][44][45][46] Typically, V 2 O 5 /TiO 2 composites have been prepared for electrochemical use as either amorphous or crystalline thin-films by conventional 25 sol-gel chemistries using the respective metal alkoxide precursors. 21,22,20,[23][24][25][26] …”

Vanadium-oxide-based electrode materials for Li-ion batteries

“…[127] Other 1D nanostructures, such as nanorods, nanotubes, and nanofibers were also investigated for V2O5. [128][129][130][131] Takahashi et al synthesized V2O5 nanorod arrays by electrochemical deposition, using VOSO4 aqueous solution and polycarbonate membrane template.…”

“…Similar procedures of electrochemical deposition can also be used to grow V2O5 nanotube arrays by applying lower voltages and shorter deposition time. [131] Due to the large surface area and short diffusion lengths, the as-prepared nanotube arrays showed an initial capacity of 300 mAh…”