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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.


Schematic of electrochemical cell assembly for in situ XAS studies
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Fig1: Schematic of electrochemical cell assembly for in situ XAS studies

Mentions: V K-edge XAS spectra were collected at the hard X-ray beamline BL17C of the NSRRC. Electrodeposition of the V2O5 electrodes was performed potentiostatically at 0.7 V at room temperature using Au-coated Si3N4 as the substrate in the in situ reaction cell. Pt electrodes were used as the counter and reference electrodes. Figure 1 presents a schematic of the substrate-film-sample holder assembly in contact with the VOSO4·xH2O and LiClO4 electrolyte. The total fluorescence yield signal was collected with this sample holder. The samples were deposited onto a Si3N4 membrane window and used as working electrodes in a three-electrode setup. Prior to the deposition of the V2O5 films, 10-nm Au layers were evaporated on the Si3N4 window to provide an adhesive metallic current collector between V2O5 and Si3N4. The Si3N4 membrane window is transparent for X-rays; the membrane is attached to a PVC supporting frame by an Araldite® adhesive that creates a tight seal.Fig. 1


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)

Schematic of electrochemical cell assembly for in situ XAS studies
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig1: Schematic of electrochemical cell assembly for in situ XAS studies
Mentions: V K-edge XAS spectra were collected at the hard X-ray beamline BL17C of the NSRRC. Electrodeposition of the V2O5 electrodes was performed potentiostatically at 0.7 V at room temperature using Au-coated Si3N4 as the substrate in the in situ reaction cell. Pt electrodes were used as the counter and reference electrodes. Figure 1 presents a schematic of the substrate-film-sample holder assembly in contact with the VOSO4·xH2O and LiClO4 electrolyte. The total fluorescence yield signal was collected with this sample holder. The samples were deposited onto a Si3N4 membrane window and used as working electrodes in a three-electrode setup. Prior to the deposition of the V2O5 films, 10-nm Au layers were evaporated on the Si3N4 window to provide an adhesive metallic current collector between V2O5 and Si3N4. The Si3N4 membrane window is transparent for X-rays; the membrane is attached to a PVC supporting frame by an Araldite® adhesive that creates a tight seal.Fig. 1

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.