Operando Raman and UV-Vis spectroscopic investigation of the coloring and bleaching mechanism of self-powered photochromic devices for smart windows
| Autor: | Sunghyeok Park, Kyung-Koo Lee, Chi Hwan Han, Seok In Lee, So Yeon Chun, Kyungwon Kwak, Sungjun Hong, Minhaeng Cho, Han Kyu Choi, Hieu Dinh Nguyen |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry Intercalation (chemistry) Optical transmittance 02 engineering and technology Electron 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Photochromism symbols.namesake Ultraviolet visible spectroscopy Solar light symbols Optoelectronics General Materials Science Electrical and Electronic Engineering 0210 nano-technology business Raman spectroscopy |
| Zdroj: | Nano Energy. 82:105721 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2020.105721 |
| Popis: | Automatically controlling the optical transmittance of solar light provides an energy-saving strategy for designing energy-efficient buildings. Ideally, the smart windows should be able to show homogeneous and large-scale color-switching performance while modulating the intensity of daylight. Among the suitable candidates for smart windows, the photochromic device has a great potential for homogenous and large-scale color-switching material. In a photochromic device, the intercalation/deintercalation of Li-ions is a key step determining the kinetics and efficiencies of the coloring/bleaching process. Herein, we exploit operando Raman spectroscopy to investigate the photochromic mechanism, which reveals the movement of Li ions into specific sites within the tunnels that exist in hexagonal tungsten oxide (WO3). These spectroscopic results demonstrate that the intercalation/deintercalation of the Li ions is related to specific sites in the WO3 lattice which stabilizes the energy of the intermediate state during the coloring/self-bleaching process. Additionally, theoretical simulation supports that electrons, as well as Li ions, participate in the color-switching performance. This study improves our understanding of the photochromic performance of this special device and opens up a research field toward the development of smart windows applications. |
| Databáze: | OpenAIRE |
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