Dual-Band Electrochromism in Hydrous Tungsten OxideClick to copy article linkArticle link copied!
- Jenelle FortunatoJenelle FortunatoDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Jenelle Fortunato
- Benjamin Z. ZydlewskiBenjamin Z. ZydlewskiDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Benjamin Z. Zydlewski
- Ming LeiMing LeiDepartment of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, United StatesMore by Ming Lei
- Noah P. HolzapfelNoah P. HolzapfelDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Noah P. Holzapfel
- Matthew ChagnotMatthew ChagnotDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Matthew Chagnot
- James B. MitchellJames B. MitchellDepartment of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by James B. Mitchell
- Hsin-Che LuHsin-Che LuMcKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Hsin-Che Lu
- De-en JiangDe-en JiangDepartment of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, United StatesMore by De-en Jiang
- Delia J. Milliron*Delia J. Milliron*Email: [email protected]McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United StatesDepartment of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United StatesMore by Delia J. Milliron
- Veronica Augustyn*Veronica Augustyn*Email: [email protected]Department of Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, United StatesMore by Veronica Augustyn
Abstract
The independent modulation of visible and near-infrared light by a single material, termed dual-band electrochromism, is highly desirable for smart windows to enhance the energy efficiency of buildings. Tungsten oxides are commercially important electrochromic materials, exhibiting reversible visible and near-infrared absorption when electrochemically reduced in an electrolyte containing small cations or protons. The presence of structural water in tungsten oxides has been associated with faster electrochromic switching speeds. Here, we find that WO3·H2O, a crystalline hydrate, exhibits dual-band electrochromism unlike the anhydrous WO3. This provides a heretofore unexplored route to tune the electrochromic response of tungsten oxides. Absorption of near-infrared light is achieved at low Li+/e– injection, followed by the absorption of visible light at higher Li+/e– injection as a result of an electrochemically induced phase transition. We propose that the dual-band modulation is possible due to the more open structure of WO3·H2O as compared to WO3. This facilitates a more extended solid-solution Li+ insertion regime that benefits the modulation of near-infrared radiation via plasmon absorption. Higher degrees of Li+/e– insertion lead to polaronic absorption associated with localized charge storage. These results inform how structural factors influence the electrochemically induced spectral response of transition-metal oxides and the important role of structural water beyond optical switching speed.
Cited By
This article is cited by 2 publications.
- Benjamin Z. Zydlewski, Delia J. Milliron. Dual-Band Electrochromic Devices Utilizing Niobium Oxide Nanocrystals. ACS Applied Materials & Interfaces 2024, 16
(19)
, 24920-24928. https://doi.org/10.1021/acsami.4c02997
- Xiaohui Sun, Dong Wang, Wei Wu, Xueying Zhao, Xuyang Zhang, Bo Wang, Xianhui Rong, Guohua Wu, Xiangwei Wang. Amorphous and Crystalline Ti-Doped WO3·2H2O for Dual-Band Electrochromic Smart Windows. ACS Sustainable Chemistry & Engineering 2024, 12
(14)
, 5459-5467. https://doi.org/10.1021/acssuschemeng.3c07679
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