Ultrafast, Efficient 1D WO₃/NiO Nanorods-based Electrochromic Devices for Ultraviolet, Visible, and Infrared Lights: Potent Role of 1D NiO Nanorods

Ranjit A. Patil^1*, Giang Thi Phan¹, Yuan-Ron Ma¹

¹Department of Physics, National Dong Hwa University, Hualien, Taiwan

* Presenter:Ranjit A. Patil, email:ranajit27@gmail.com

Herein, we constructed the one-dimensional (1D) WO₃/ITO and WO₃/NiO nanorods-based electrochromic (EC) devices consists of WO₃ nanorods of various widths and lengths. The 1D WO₃ nanorods were synthesized using hot filament metal oxide vapor deposition (HFMOVD) technique at various temperatures followed by controlled oxidation. We show how the use of NiO nanorods in the 1D WO₃/NiO nanorods-based EC devices can enhance 4-5 times the change in optical transmittance than 1D WO₃/ITO EC devices between the colored and bleached states. The use of NiO nanorods not only improves the change in optical transmittance of the EC devices but also, shows ultrafast switching times, high coloration efficiency, excellent stability, great electrochromic memory, and endurance. The potent role played by the 1D NiO nanorods in ultrafast and efficient 1D WO₃/NiO nanorods-based EC devices is revealed using electrochemical impedance spectroscopy.

Keywords: Electrochromism, NiO, WO3, 1D Nanorods, Counter electrode