V<sub>2</sub>O<sub>5</sub>-Anchored Carbon Nanotubes for Enhanced Electrochemical Energy Storage

Mariyappan, Sathiya; Prakash, A. S.; Ramesha, K.; Jm, Tarascon; Shukla, Ashok

doi:10.1021/ja207285b

Cited by 935 publications

(590 citation statements)

References 42 publications

(60 reference statements)

Supporting

Mentioning

570

Contrasting

Unclassified

Order By: Relevance

“…It is known that the overall capacitance of a material can be also ascribed to other phenomena such as surface double layer formation or surface faradaic adsorption, and to bulk faradaic intercalation/de-intercalation reactions. The occurrence of these different mechanisms of energy storage can be identified (and differentiated from the others) by analysing the CV data at various sweep rates according to equation (3), and can be illustrated by plotting log (i) vs. log (Ѵ) as a function of potential [67,68]:…”

Section: à3mentioning

confidence: 99%

“…In the positive potential range (0.1-0.4 V) the b-values approach 1 indicating that the current response arises predominantly either from redox phenomena at the nanochannel surface or from double layer formation. However, in the negative potential region, b-values are in the range of 0.55 to 0.7 indicating the occurrence of diffusion controlled processes, which can be associated with diffusion of cations towards the bulk of the material [68].…”

Section: à3mentioning

confidence: 99%

See 1 more Smart Citation

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

View full text Add to dashboard Cite

Keywords: electrochemical anodization WO 3 nanostructure phosphoric acid supercapacitor energy storage A B S T R A C T Herein we illustrate the functionality as pseudocapacitive material of tungsten trioxide (WO 3 ) nanochannel layers fabricated by electrochemical anodization of W metal in pure hot ortho-phosphoric acid (o-H 3 PO 4 ). These layers are characterized by a defined nanochannel morphology and show remarkable pseudocapacitive behaviour in the negative potential (À0.8-0.5 V) in neutral aqueous electrolyte (1 M Na 2 SO 4 ). The maximum volumetric capacitance of 397 F cm À3 is obtained at 2 A cm À3. The WO 3 nanochannel layers display full capacitance retention (up to 114%) after 3500 charge-discharge cycles performed at 10 A cm À3 . The relatively high capacitance and retention ability are attributed to the high surface area provided by the regular and defined nanochannel morphology. Kinetic analysis of the electrochemical results for the best performing WO 3 structures, i.e., grown by 2 h-long anodization, reveals the occurrence of pseudocapacitance and diffusional controlled processes. Electrochemical impedance spectroscopy measurements show for the same structures a relatively low electrical resistance, which is the plausible cause for the superior electrochemical behaviour compared to the other structures.

show abstract

Section: à3mentioning

confidence: 99%

Section: à3mentioning

confidence: 99%

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

Upadhyay

Altomare

Eugénio

et al. 2017

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…在二次电池中, 锂离子电池由于其较高的比容量及能量转换效率而被广泛研究与应用 [7,8] . 凝胶的层间距较大, 可达 14.0 Å 以上, 超过了三斜晶系 [18,24,25] . 然而, 正是由于其层间距较大, V 2 O 5 凝胶的双层结构在离子嵌入时收缩明显, 在离子脱出时膨胀严重, 导致充放电过程中结构不稳定 [26,27] .…”

Section: 引言unclassified

In SituObservation and Mechanism Investigation of Lattice Breathing in Vanadium Oxide Cathode

Zhang¹,

Xiong²,

Pan³

et al. 2016

Acta Chim. Sinica

View full text Add to dashboard Cite

As cathode materials in lithium-ion batteries, layered vanadium oxides have been extensively studied and used in many aspects varying from industrial production to our daily life, due to their excellent physical property and gorgeous lithium storage performance. During lithiation/delithiation, layered vanadium oxides such as V 2 O 5 xerogel (with a bilayer structure), undergoes "lattice breathing" which leads to the deactivation of electrode materials and fast capacity fading, which limits its large-scale application. In this work, VO x is used as the cathode material of lithium-ion batteries to study the "lattice breathing" phenomenon. The phase evolution has been observed and studied via in situ method. The X-ray diffraction (XRD) patterns show typical (001) diffraction peaks characteristic of vanadium oxide xerogel structure and also confirm the good crystallinity. This compound with crystal parameters of a＝4.56 Å, b＝14.87 Å, c＝12.38 Å, α＝117.26°, β＝96.02°, γ＝ 81.86°, forms a triclinic structure. Results of scanning electron microscope (SEM) and transmission electron microscope (TEM) further verify the layered structure of VO x . The thermo gravimetric analysis (TGA) at air and nitrogen atmosphere shows that the carbon content of the sample is about 2.4 wt% and the water content is about 2.1%. As lithium-ion battery cathode the initial discharge capacity of the compound is about 136 mA•h/g at a current density of 100 mA/g, with a capacity retention of 92.6% after 50 cycles. To study the lithium storage mechanism of VO x , electrochemical discharge/charge processes are further investigated by in situ XRD. It is found that the lattice plane diffraction displays three different stages linked during the insertion and deinsertion of lithium ions, indicating three solid solution reactions. During discharge process, the three diffraction changes show continuous shifts to higher diffraction angles, demonstrating three different continuous contraction processes with the insertion of lithium ions. Nevertheless, the evolution of the (001) peak is swift during the beginning and the end of discharge, in contrast to the slow deviation of the intermediate process. In the whole process, the diffraction pattern displays periodic changes, confirming the reversibility of the reaction process. The corresponding calculations of d 001 during the discharge/charge process prove the notable discontinuity between these three stages. In addition, cycling experiments conducted at the higher and the lower temperature indicate that the electrochemical performance of this compound is highly sensitive to temperature.

show abstract

“…Vanadium based oxides show a variety of interesting properties like catalytic behavior 14,15 , metal insulator transition [16][17][18] and super capacitor 11,19,20 properties. The low cost, high abundance, easy synthesis and high energy density 21,22 of vanadium pentaoxide (V 2 O 5 ) make it useful as a cathode material for Li and Na ion batteries 4,9,[23][24][25][26][27][28][29][30] . It also finds application in solar cells 31 as window material, antireflection coatings, critical temperature sensors 32 and light detectors.…”

Section: Introductionmentioning

confidence: 99%

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

Singh

Gupta

Mishra

et al. 2017

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We present the structural and dynamical studies of layered vanadium pentaoxide (V 2 O 5 ). The temperature dependent X-ray diffraction measurements reveal highly anisotropic and anomalous thermal expansion from 12 K to 853 K. The results do not show any evidence of structural phase transition or decomposition of α-V 2 O 5 , contrary to the previous transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) experiments. The inelastic neutron scattering measurements performed up to 673 K corroborate the result of our X-ray diffraction measurements. The analysis of the experimental data is carried out using ab-initio lattice dynamics calculation. The important role of van der-Waals dispersion and Hubbard interactions on the structure and dynamics is revealed through the abinitio calculations. The calculated anisotropic thermal expansion behavior agrees well with temperature dependent X-ray diffraction. The mechanism of anisotropic thermal expansion and anisotropic linear compressibility is discussed in terms of calculated anisotropy in Grüneisen parameters and elastic coefficients. The calculated Gibbs free energy in various phases of V 2 O 5 is used to understand the high pressure and temperature phase diagram of the compound. Softening of elastic constant (C 66 ) with pressure suggests a possibility of shear mechanism for α to β phase transformation under pressure.

show abstract

V₂O₅-Anchored Carbon Nanotubes for Enhanced Electrochemical Energy Storage

Cited by 935 publications

References 42 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

In SituObservation and Mechanism Investigation of Lattice Breathing in Vanadium Oxide Cathode

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

Contact Info

Product

Resources

About

V2O5-Anchored Carbon Nanotubes for Enhanced Electrochemical Energy Storage

Cited by 935 publications

References 42 publications

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes

In SituObservation and Mechanism Investigation of Lattice Breathing in Vanadium Oxide Cathode

Anomalous lattice behavior of vanadium pentaoxide (V2O5): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics

Contact Info

Product

Resources

About

V₂O₅-Anchored Carbon Nanotubes for Enhanced Electrochemical Energy Storage

Anomalous lattice behavior of vanadium pentaoxide (V₂O₅): X-ray diffraction, inelastic neutron scattering and ab initio lattice dynamics