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Mechanism of Electrochemical Deposition and Coloration of Electrochromic V2O5 Nano Thin Films: an In Situ X-Ray Spectroscopy Study.

Lu YR, Wu TZ, Chen CL, Wei DH, Chen JL, Chou WC, Dong CL - Nanoscale Res Lett (2015)

Bottom Line: Chronoamperometric analyses have indicated that the thin V2O5 film demonstrates faster intercalation and deintercalation of lithium ions than those of the thick V2O5 film, benefiting the coloration rate.Despite substantial research on the synthesis of vanadium oxides, the monitoring of electronic and atomic structures during growth and coloration of such material has not been thoroughly examined.This study improves our understanding of the electronic and atomic properties of the vanadium oxide system grown by electrochemical deposition and enhances the design of electrochromic materials for potential energy-saving applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Tamkang University, New Taipei, 25137, Taiwan. porsche911959@hotmail.com.

ABSTRACT
Electrochromic switching devices have elicited considerable attention because these thin films are among the most promising materials for energy-saving applications. The vanadium oxide system is simple and inexpensive because only a single-layer film of this material is sufficient for coloration. Vanadium dioxide thin films are fabricated by electrochemical deposition and cyclic voltammetry. Chronoamperometric analyses have indicated that the thin V2O5 film demonstrates faster intercalation and deintercalation of lithium ions than those of the thick V2O5 film, benefiting the coloration rate. Despite substantial research on the synthesis of vanadium oxides, the monitoring of electronic and atomic structures during growth and coloration of such material has not been thoroughly examined. In the present study, in situ X-ray absorption spectroscopy (XAS) is employed to determine the electronic and atomic structures of V2O5 thin films during electrochemical growth and then electrochromic coloration. In situ XAS results demonstrate the growth mechanism of the electrodeposited V2O5 thin film and suggest that its electrochromic performance strongly depends on the local atomic structure. This study improves our understanding of the electronic and atomic properties of the vanadium oxide system grown by electrochemical deposition and enhances the design of electrochromic materials for potential energy-saving applications.

No MeSH data available.


SEM image of V2O5 electrode deposited for a 20, b 40, and c 60 s
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Fig2: SEM image of V2O5 electrode deposited for a 20, b 40, and c 60 s

Mentions: Figure 2 shows SEM which examines the surface morphology of the electrochemical growth of the V2O5 thin films. The V2O5 thin films that were deposited for 20 s were relatively smooth and adhered very well onto the substrate, as shown in Fig. 2a. As the deposition time increased to 40 and 60 s, the morphology of the V2O5 thin films significantly changed (Fig. 2b, c). The morphology of the V2O5 thin films changed from smooth to typical sea-island morphology. The film thickness of the electrochemical growth of the V2O5 thin films was measured using the cross-sectional SEM images (inset of Fig. 2a–c), with thicknesses of 321, 621, and 1047 nm for the deposition times of 20, 40, and 60 s, respectively.Fig. 2


Mechanism of Electrochemical Deposition and Coloration of Electrochromic V2O5 Nano Thin Films: an In Situ X-Ray Spectroscopy Study.

Lu YR, Wu TZ, Chen CL, Wei DH, Chen JL, Chou WC, Dong CL - Nanoscale Res Lett (2015)

SEM image of V2O5 electrode deposited for a 20, b 40, and c 60 s
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593985&req=5

Fig2: SEM image of V2O5 electrode deposited for a 20, b 40, and c 60 s
Mentions: Figure 2 shows SEM which examines the surface morphology of the electrochemical growth of the V2O5 thin films. The V2O5 thin films that were deposited for 20 s were relatively smooth and adhered very well onto the substrate, as shown in Fig. 2a. As the deposition time increased to 40 and 60 s, the morphology of the V2O5 thin films significantly changed (Fig. 2b, c). The morphology of the V2O5 thin films changed from smooth to typical sea-island morphology. The film thickness of the electrochemical growth of the V2O5 thin films was measured using the cross-sectional SEM images (inset of Fig. 2a–c), with thicknesses of 321, 621, and 1047 nm for the deposition times of 20, 40, and 60 s, respectively.Fig. 2

Bottom Line: Chronoamperometric analyses have indicated that the thin V2O5 film demonstrates faster intercalation and deintercalation of lithium ions than those of the thick V2O5 film, benefiting the coloration rate.Despite substantial research on the synthesis of vanadium oxides, the monitoring of electronic and atomic structures during growth and coloration of such material has not been thoroughly examined.This study improves our understanding of the electronic and atomic properties of the vanadium oxide system grown by electrochemical deposition and enhances the design of electrochromic materials for potential energy-saving applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Tamkang University, New Taipei, 25137, Taiwan. porsche911959@hotmail.com.

ABSTRACT
Electrochromic switching devices have elicited considerable attention because these thin films are among the most promising materials for energy-saving applications. The vanadium oxide system is simple and inexpensive because only a single-layer film of this material is sufficient for coloration. Vanadium dioxide thin films are fabricated by electrochemical deposition and cyclic voltammetry. Chronoamperometric analyses have indicated that the thin V2O5 film demonstrates faster intercalation and deintercalation of lithium ions than those of the thick V2O5 film, benefiting the coloration rate. Despite substantial research on the synthesis of vanadium oxides, the monitoring of electronic and atomic structures during growth and coloration of such material has not been thoroughly examined. In the present study, in situ X-ray absorption spectroscopy (XAS) is employed to determine the electronic and atomic structures of V2O5 thin films during electrochemical growth and then electrochromic coloration. In situ XAS results demonstrate the growth mechanism of the electrodeposited V2O5 thin film and suggest that its electrochromic performance strongly depends on the local atomic structure. This study improves our understanding of the electronic and atomic properties of the vanadium oxide system grown by electrochemical deposition and enhances the design of electrochromic materials for potential energy-saving applications.

No MeSH data available.