Abstract
A small ac-signal impedance analysis was utilized to characterize the surface property of an ITO electrode and Li transport in an Li x WO 3 electrode. The as-deposited ITO film has a surface layer with extremely high carrier density, which could be easily removed by mechanical polishing. Based on the kinetic model of Li x WO 3, the diffusion coefficient of Li transport was obtained. It depends on the various deposition conditions of WO 3 films and the composition of the electrolyte used. The response of Li x WO 3 film showed a gradual decrease and reached a certain equilibrium after repeated cycling (more than 10 4 times). The examination of such a degradation phenomenon leads to the conclusion that there are two active sites in the WO 3 structure, which are available for the Li ion; one for coloration ( xLi + + WO 3 + xe − ↔ Li x WO 3), and the other for an ion exchange reaction expressed by WO-H+Li + ↔ WO-Li+H +. The mechanism of these phenomena are further discussed. Impedance analysis has been proved to be very sensitive and applicable enough to the quantitative characterization of ITO and Li x WO 3 electrodes involved in the electrochromic device.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
