Improvement in electrochemical performance of V2O5 by Cu doping

Wei, Yingjin; Ryu, Chang Wan; Kim, Kwang Bum

doi:10.1016/j.jpowsour.2006.12.016

Cited by 114 publications

(83 citation statements)

References 24 publications

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“…18,19 Hence the transmittance variation of V 2 O 5 · nH 2 O films increased by 35% at the wavelength of 640 nm. 4 Besides, the addition of MoO 3 can stabilize the matrix structure, thereby improving the cycle reversibility and stability.…”

Section: 8mentioning

confidence: 98%

“…17 When the molybdenum ion (Mo 6+ ) was intercalated, the Mo 6+ generated a donor-like defect owing to providing quasi-free electron with the formation of substitution solid solution and introduced new energy level in bandgap. 18,19 Hence the transmittance variation of V 2 O 5 · nH 2 O films increased by 35% at the wavelength of 640 nm. 4 Besides, the addition of MoO 3 can stabilize the matrix structure, thereby improving the cycle reversibility and stability.…”

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confidence: 98%

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Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

Ma¹,

Lu²,

Wan³

et al. 2016

ECS J. Solid State Sci. Technol.

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Graphene/V 2 O 5 /MoO 3 (GVM) films were fabricated by the sol-gel method. The structure, electrochemical and electrochromic properties were investigated by means of X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), cyclic voltammetry, chronoamperometry and UV-Visible spectrophotometer. The optical modulatory range of the GVM film was enlarged to 25.35%, which is 1.38 times larger than that of V 2 O 5 (V) films. The cyclic stability is improved significantly and the films perform well in the response rate. The bleaching time is 1.25 seconds, and the coloration time is 1.40 seconds. These results demonstrate that the GVM films are excellent candidates for the fast switching electrochromic materials. © 2016 The Electrochemical Society. [DOI: 10.1149/2.0031610jss] All rights reserved.Manuscript submitted May 24, 2016; revised manuscript received August 15, 2016. Published September 3, 2016 Electrochromism (EC) is a phenomenon in which materials are capable of changing their optical properties in a reversible and persistent way under the action of an electric field.1-3 Among the varieties of electrochromic materials, vanadium pentoxide (V 2 O 5 ) is one of the most promising electrochromic inorganic materials due to its exceptional electrochromic behavior. 4 Especially V 2 O 5 has not only both anodic and cathodic electrochromic properties but also large charge capacity.5,3 Furthermore, the V 2 O 5 -based films which contain mixed valence vanadium (V 5+ and V 4+ ) possess the multi-electrochromic behavior.6 However, the vanadium pentoxide (V 2 O 5 ) xerogel with ntype semiconducting properties has some disadvantages comparing with other metal oxides, such as low electrical conductivity, poor coloration efficiency and narrow color variation. Meanwhile, it shows a bad cycle stability by virtue of the interaction between the inserted Li + ions and the host structure of V 2 O 5 . 7,8All of these drawbacks prevent the commercialization of V 2 O 5 -based electrochromic devices, therefore various efforts have been made in order to improve their electrochromic and electrochemical properties. One of the effective ways to improve the electrochemical and electrochromic properties of V 2 O 5 is doped with other materials or combining with other electrochromic films.9 Previous report suggests that the doping of titanium ion (Ti 4+ ) could enhance the electrical conductivity of the film at room temperature.10 While the doping of CeO is responsible for the improvement of the cycling durability.11 Other studies showing the doping of the high-valence cations (W 6+ , Mo 6+ ) could increase the optical and electrical conductivity.12,13 MoO 3 is one of the main objects of electrochromic materials.14,15 It offers higher coloration efficiency and has richer colors. 16 The interaction between V 2 O 5 and MoO 3 is unique because their ionic radii and the structure in their highest oxidation state are similar.17 When the molybdenum ion (Mo 6+ ) was intercalated, the Mo 6+ generated a donor-like defect owing to providing quasi...

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Section: 8mentioning

confidence: 98%

mentioning

confidence: 98%

Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

Ma¹,

Lu²,

Wan³

et al. 2016

ECS J. Solid State Sci. Technol.

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“…Cation doping is able to turn V2O5 into mixedvalence vanadium oxide by generating a few V 4+ ions, which leads to higher electrical conductivities. [241] Furthermore, the presence of doped cations within the slabs of V2O5…”

Section: Discussionmentioning

confidence: 99%

“…Three anodic peaks at 3.49, 3.39, and 2.67 V emerged when the active material changed its phase back to δ-LiV2O5, ε-Li0.5V2O5, and α-V2O5, respectively. [241] Compared with V2O5, the current densities of those modified samples were larger, indicating that their electrical conductivities were enhanced due to the presence of electrically conductive MWCNTs and PEDOT. In particular, VP20 possessed the highest current density among the materials.…”

Section: Physical Characterizationmentioning

confidence: 95%

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

Liu¹

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Vanadium pentoxide (V2O5) with a layered crystalline structure is a promising cathode material for lithium-ion batteries (LIBs) However, several problems largely restrict the battery performance of V2O5, such as small Li + diffusion coefficient, low electrical conductivity, irreversible phase transitions, and dissolution of vanadium into the electrolyte. Therefore, V2O5 exhibits poor rate capability and cycling stability. This thesis aims to improve the performance of V2O5 in regard to its electrical conductivity, lithium diffusion coefficient, and structural stability of V2O5 by using strategies, such as nanostructuring, element doping, adding carbon additives, and conductive polymer coating. .

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Hydrogenated V₂O₅ Nanosheets for Superior Lithium Storage Properties

Peng

Zhang

Wang

et al. 2015

Adv Funct Materials

164

106

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V2O5 is a promising cathode material for lithium ion batteries boasting a large energy density due to its high capacity as well as abundant source and low cost. However, the poor chemical diffusion of Li+, low conductivity, and poor cycling stability limit its practical application. Herein, oxygen‐deficient V2O5 nanosheets prepared by hydrogenation at 200 °C with superior lithium storage properties are described. The hydrogenated V2O5 (H‐V2O5) nanosheets deliver an initial discharge capacity as high as 259 mAh g−1 and it remains 55% when the current density is increased 20 times from 0.1 to 2 A g−1. The H‐V2O5 electrode has excellent cycling stability with only 0.05% capacity decay per cycle after stabilization. The effects of oxygen defects mainly at bridging O(II) sites on Li+ diffusion and overall electrochemical lithium storage performance are revealed. The results reveal here a simple and effective strategy to improve the capacity, rate capability, and cycling stability of V2O5 materials which have large potential in energy storage and conversion applications.

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Improvement in electrochemical performance of V2O5 by Cu doping

Cited by 114 publications

References 24 publications

Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

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

Hydrogenated V₂O₅ Nanosheets for Superior Lithium Storage Properties

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Improvement in electrochemical performance of V2O5 by Cu doping

Cited by 114 publications

References 24 publications

Synthesis and Electrochromic Characterization of Graphene/V2O5/MoO3Nanocomposite Films

Synthesis and Electrochromic Characterization of Graphene/V2O5/MoO3Nanocomposite Films

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

Hydrogenated V2O5 Nanosheets for Superior Lithium Storage Properties

Contact Info

Product

Resources

About

Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

Synthesis and Electrochromic Characterization of Graphene/V₂O₅/MoO₃Nanocomposite Films

Hydrogenated V₂O₅ Nanosheets for Superior Lithium Storage Properties