Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity
Porous WO3 films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching sp...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2016
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| Online Access: | https://hdl.handle.net/10356/80607 http://hdl.handle.net/10220/40614 |
| _version_ | 1826124911859466240 |
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| author | Cai, Guofa Cui, Mengqi Kumar, Vipin Darmawan, Peter Wang, Jiangxin Wang, Xu Eh, Alice Lee-Sie Qian, Kai Lee, Pooi See |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Cai, Guofa Cui, Mengqi Kumar, Vipin Darmawan, Peter Wang, Jiangxin Wang, Xu Eh, Alice Lee-Sie Qian, Kai Lee, Pooi See |
| author_sort | Cai, Guofa |
| collection | NTU |
| description | Porous WO3 films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching speed (6 and 2.7 s), high coloration efficiency (118.3 cm2 C−1), and excellent cycling stability are achieved by the porous WO3 on ITO-coated glass. The outstanding electrochromic performances of the porous WO3 film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the WO3 during H+ insertion compared to that of the compact structure. In addition, the relationships between the structural and electrochemical activity of the electrochromic WO3 films were further explored by the scanning electrochemical microscopy. These results testify that the porous structure can promote the infiltration of electrolyte and reduce the diffusion path, which consequently enhance the electrochemical activity. |
| first_indexed | 2024-10-01T06:28:06Z |
| format | Journal Article |
| id | ntu-10356/80607 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:28:06Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/806072023-07-14T15:49:47Z Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity Cai, Guofa Cui, Mengqi Kumar, Vipin Darmawan, Peter Wang, Jiangxin Wang, Xu Eh, Alice Lee-Sie Qian, Kai Lee, Pooi See School of Materials Science & Engineering Electrochromic materials Porous WO3 films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching speed (6 and 2.7 s), high coloration efficiency (118.3 cm2 C−1), and excellent cycling stability are achieved by the porous WO3 on ITO-coated glass. The outstanding electrochromic performances of the porous WO3 film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the WO3 during H+ insertion compared to that of the compact structure. In addition, the relationships between the structural and electrochemical activity of the electrochromic WO3 films were further explored by the scanning electrochemical microscopy. These results testify that the porous structure can promote the infiltration of electrolyte and reduce the diffusion path, which consequently enhance the electrochemical activity. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2016-06-03T07:47:13Z 2019-12-06T13:53:08Z 2016-06-03T07:47:13Z 2019-12-06T13:53:08Z 2015 2016 Journal Article Cai, G., Cui, M., Kumar, V., Darmawan, P., Wang, J., Wang, X., et al. (2016). Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity. Chemical Science, 7, 1373-1382. 2041-6520 https://hdl.handle.net/10356/80607 http://hdl.handle.net/10220/40614 10.1039/C5SC03727A 192884 en Chemical Science © 2016 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. 10 p. application/pdf |
| spellingShingle | Electrochromic materials Cai, Guofa Cui, Mengqi Kumar, Vipin Darmawan, Peter Wang, Jiangxin Wang, Xu Eh, Alice Lee-Sie Qian, Kai Lee, Pooi See Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title | Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title_full | Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title_fullStr | Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title_full_unstemmed | Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title_short | Ultra-large optical modulation of electrochromic porous WO3 film and the local monitoring of redox activity |
| title_sort | ultra large optical modulation of electrochromic porous wo3 film and the local monitoring of redox activity |
| topic | Electrochromic materials |
| url | https://hdl.handle.net/10356/80607 http://hdl.handle.net/10220/40614 |
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