Synergistic effects of Ti-doping induced porous networks on electrochromic performance of WO3 films
| Autor: | Sunghyoek Park, Chi-Hwan Han, Seung Han Song, Hee Sung Park, Saad Sarwar, Dao Thi Thuy, Sungjun Hong, Seok In Lee, Hung Van Tran |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C. 8:17245-17253 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | In this study, amorphous Ti-doped WO3 films with interpenetrated porous networks were successfully fabricated via a facile sol–gel method by using a hydrolysis-tolerant titanium coupling agent (TCA) as a Ti-dopant. We found that the TCA played multiple roles in forming electrochromic WO3 films. First, introducing a TCA into an acetylated peroxotungstic acid (A-PTA) precursor sol was found to prolong the shelf life, which is crucial for practical application. Second, the TCA also acted as a pore-forming agent to form an inter-penetrated porous network in the resultant amorphous WO3 films by annealing at 250 °C. Finally, the TCA generated a higher degree of oxygen vacancy in WO3 films than that in pure WO3 films. Combining all these properties, 8 wt% TCA-doped WO3 films exhibit much larger optical contrast, a faster switching speed and a higher coloration efficiency compared with the corresponding neat WO3 film. The superior electrochromic performances of the TCA-doped WO3 film were attributed to the synergistic effects of the porous structure and oxygen vacancies on the WO3 film, which facilitate the charge-transfer and promote the electrolyte infiltration. |
| Databáze: | OpenAIRE |
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