A comprehensive study on the multicolor electrochromic performance of sputtered nanostructured-V2O5 thin films

Vanadium pentoxide (V2O5) attracts significant attention in electrochromism due to its multicolor aspects and high ion storage capacity. This study comprehensively investigates the electrochromic properties of nano-structured V2O5 thin films deposited via RF magnetron sputtering. The research aims to optimize growth parameters and post-annealing conditions to achieve superior electrochemical stability, fast response times, and enhanced optical modulation. In this context, the film growth at 100 degrees C has exhibited a nanowall morphology, as well as improved electrochromic performance. The 200 degrees C post-annealing process has enhanced the structural quality and electrochromic performance of the obtained film. This film exhibits the highest stability, with transmittance retention of 97.9 % at 450 nm and 92.6 % at 700 nm after 900 cycles, outperforming other samples. The coloration and bleaching times at 450 nm have been recorded as 1.6 s and 1.5 s, respectively, demonstrating rapid switching behavior. Furthermore, this sample has maintained high optical modulation, showing a maximum transmittance change of 52.4 % at 450 nm and 29.1 % at 700 nm. As the cathodic voltage changes from +1.0 V to-0.5 V, the color of the thin film shifts from transparent yellow to yellow-green, then green, and eventually deep blue, demonstrating multicolor switching. Furthermore, after 1500 cycles, the film retains 77.8 % of its initial specific capacitance.

Journal

JOURNAL OF POWER SOURCES

Year

2025

Volume

657

ISSN

0378-7753

eISSN

1873-2755

DOI

10.1016/j.jpowsour.2025.238139

WoS UID

WOS:001576893000003