title: Mechanism of Electrochemical Deposition and Coloration of Electrochromic V2O5 Nano Thin Films: an In Situ X-Ray Spectroscopy Study.
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.
authors.affiliation: Department of Physics, Tamkang University, New Taipei, 25137, Taiwan. porsche911959@hotmail.com.|Program for Science and Technology of Accelerator Light Source, National Chiao Tung University, Hsinchu, 30010, Taiwan. porsche911959@hotmail.com.|National Synchrotron Radiation Research Center (NSRRC), Hsinchu, 30076, Taiwan. porsche911959@hotmail.com.
authors.forename: Ying-Rui
authors.initials: YR
authors.lastname: Lu
authors.affiliation: Department of Physics, Tamkang University, New Taipei, 25137, Taiwan. tz_wu@outlook.com.|Department of Mechanical Engineering and Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan. tz_wu@outlook.com.
authors.forename: Tzung-Zing
authors.initials: TZ
authors.lastname: Wu
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), Hsinchu, 30076, Taiwan. clchen@phys.sinica.edu.tw.
authors.forename: Chi-Liang
authors.initials: CL
authors.lastname: Chen
authors.affiliation: Department of Mechanical Engineering and Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, 106, Taiwan. dhwei@ntut.edu.tw.
authors.forename: Da-Hau
authors.initials: DH
authors.lastname: Wei
authors.affiliation: National Synchrotron Radiation Research Center (NSRRC), Hsinchu, 30076, Taiwan. chen.jl@nsrrc.org.tw.
authors.forename: Jeng-Lung
authors.initials: JL
authors.lastname: Chen
authors.affiliation: Department of Electrophysics, National Chiao Tung University, Hsinchu, 30010, Taiwan. wuchingchou@mail.nctu.edu.tw.
authors.forename: Wu-Ching
authors.initials: WC
authors.lastname: Chou
authors.affiliation: Department of Physics, Tamkang University, New Taipei, 25137, Taiwan. cldong@mail.tku.edu.tw.
authors.forename: Chung-Li
authors.initials: CL
authors.lastname: Dong
keywords: Electrochromism; In situ X-ray spectroscopy study; V2O5 thin films