Abstract
The effect of annealing temperature on the electrochromic properties of acid-treated hydrated tungsten oxide (WO3·H2O) nanoplates is reported for the first time. Nanoplates were grown on fluorine-doped tin oxide-coated glass substrate using nitric acid, and annealing temperature was varied from 100–400°C. The as-prepared nanoplates were WO3·H2O, and these nanoplates transformed into tungsten oxide (WO3) after annealing at ≥200°C. Nanoplate thickness decreased with increasing annealing temperature from 12–55nm for the as-prepared sample to 12–40nm for the sample annealed at 400°C. WO3 nanoplates annealed at 200°C showed the best electrochromic properties with coloration efficiency of 28.64cm2C−1, high optical modulation (58%), good electrochromic cycling stability, as well as short ion insertion and extraction times of ∼9.6 and ∼5.1s, respectively.
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