Electronic and atomic structures of gasochromic V2O5 films

C. L. Chen; C. L. Dong; Y. K. Ho; C. C. Chang; Da Hua Wei; A. T C Chan; J. L. Chen; W. L. Jang; C. C. Hsu; Krishna Kumar; M. K. Wu

doi:10.1209/0295-5075/101/17006

Electronic and atomic structures of gasochromic V_2O5 films

C. L. Chen, C. L. Dong, Y. K. Ho, C. C. Chang, Da Hua Wei, A. T C Chan, J. L. Chen, W. L. Jang, C. C. Hsu, Krishna Kumar, M. K. Wu

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

A gasochromic Pt/V₂O₅ film was fabricated by the sol-gel process and it exhibited excellent color change performance from yellow to gray/black upon exposure to hydrogen gas under ambient conditions. X-ray absorption spectroscopy was employed to study the unoccupied electronic states in detail and to explore the gasochromic effect and its coloration mechanism. Upon injection of hydrogen, gashochromism was revealed to correlate strongly with the change of both electronic and atomic structures. Since the hydrogen supplied an extra electron, the hybridization between vanadium 3d and oxygen 2p was modified, reducing the valence state of vanadium from 5 + to 4.1 + . Linear polarized synchrotron X-rays were utilized to investigate the change in the structural symmetry and the orbital orientation. Along with the electronic structure, the geometric modulation of the VO₆ octahedron is crucial to the gasochromic mechanism, as also revealed in this study.

Original language	English
Article number	17006
Journal	Europhysics Letters
Volume	101
Issue number	1
DOIs	https://doi.org/10.1209/0295-5075/101/17006
Publication status	Published - Jan 2013
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Electronic and atomic structures of gasochromic V2O5 films",

abstract = "A gasochromic Pt/V2O5 film was fabricated by the sol-gel process and it exhibited excellent color change performance from yellow to gray/black upon exposure to hydrogen gas under ambient conditions. X-ray absorption spectroscopy was employed to study the unoccupied electronic states in detail and to explore the gasochromic effect and its coloration mechanism. Upon injection of hydrogen, gashochromism was revealed to correlate strongly with the change of both electronic and atomic structures. Since the hydrogen supplied an extra electron, the hybridization between vanadium 3d and oxygen 2p was modified, reducing the valence state of vanadium from 5 + to 4.1 + . Linear polarized synchrotron X-rays were utilized to investigate the change in the structural symmetry and the orbital orientation. Along with the electronic structure, the geometric modulation of the VO6 octahedron is crucial to the gasochromic mechanism, as also revealed in this study.",

author = "Chen, {C. L.} and Dong, {C. L.} and Ho, {Y. K.} and Chang, {C. C.} and Wei, {Da Hua} and Chan, {A. T C} and Chen, {J. L.} and Jang, {W. L.} and Hsu, {C. C.} and Krishna Kumar and Wu, {M. K.}",

year = "2013",

month = jan,

doi = "10.1209/0295-5075/101/17006",

language = "English",

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T1 - Electronic and atomic structures of gasochromic V2O5 films

AU - Chen, C. L.

AU - Dong, C. L.

AU - Ho, Y. K.

AU - Chang, C. C.

AU - Wei, Da Hua

AU - Chan, A. T C

AU - Chen, J. L.

AU - Jang, W. L.

AU - Hsu, C. C.

AU - Kumar, Krishna

AU - Wu, M. K.

PY - 2013/1

Y1 - 2013/1

N2 - A gasochromic Pt/V2O5 film was fabricated by the sol-gel process and it exhibited excellent color change performance from yellow to gray/black upon exposure to hydrogen gas under ambient conditions. X-ray absorption spectroscopy was employed to study the unoccupied electronic states in detail and to explore the gasochromic effect and its coloration mechanism. Upon injection of hydrogen, gashochromism was revealed to correlate strongly with the change of both electronic and atomic structures. Since the hydrogen supplied an extra electron, the hybridization between vanadium 3d and oxygen 2p was modified, reducing the valence state of vanadium from 5 + to 4.1 + . Linear polarized synchrotron X-rays were utilized to investigate the change in the structural symmetry and the orbital orientation. Along with the electronic structure, the geometric modulation of the VO6 octahedron is crucial to the gasochromic mechanism, as also revealed in this study.

AB - A gasochromic Pt/V2O5 film was fabricated by the sol-gel process and it exhibited excellent color change performance from yellow to gray/black upon exposure to hydrogen gas under ambient conditions. X-ray absorption spectroscopy was employed to study the unoccupied electronic states in detail and to explore the gasochromic effect and its coloration mechanism. Upon injection of hydrogen, gashochromism was revealed to correlate strongly with the change of both electronic and atomic structures. Since the hydrogen supplied an extra electron, the hybridization between vanadium 3d and oxygen 2p was modified, reducing the valence state of vanadium from 5 + to 4.1 + . Linear polarized synchrotron X-rays were utilized to investigate the change in the structural symmetry and the orbital orientation. Along with the electronic structure, the geometric modulation of the VO6 octahedron is crucial to the gasochromic mechanism, as also revealed in this study.

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Electronic and atomic structures of gasochromic V_2O5 films

Abstract

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