Origin of fast color switching in electrochromic smart window: in situ x-ray spectroscopy studies
Ying-Rui Lu1,2*, Jeng-Lung Chen1, Shih-Hsien Chen1,2, Ting-Shan Chan1, Chi-Liang Chen3, Wu-Ching Chou4, Chung-Li Dong1
1National Synchrotron Radiation Research Center, Hsinchu, Taiwan
2Program for Science and Technology of Accelerator Light Source, National Chiao Tung University, Hsinchu, Taiwan
3Institute of Physics, Academia Sinica, Taipei, Taiwan
4Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
* presenting author:盧英睿, email:porsche911959@hotmail.com
Mo-modified V2O5 thin films were prepared by spin coating from a stable Mo-doped V2O5 sol synthesized using the sol–gel method. The thin films exhibited multi-electrochromic behavior (orange–yellow–green–blue). The electrochemical properties of the Mo-modified V2O5 thin films were studied by cyclic voltammetry with a standard three-electrode configuration. In-situ soft-X-ray coupled with in-situ hard-X-ray absorption spectroscopy was performed to monitor the effect of delitiation/lithiation on the oxidation states of vanadium and the local atomic structure in the Mo-modified V2O5 thin films. Experimental results suggest that the electrochromism performance of the Mo-modified V2O5 thin films strongly depended on the local atomic structure.

Keywords: electrochromic