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Research Article | Open Access

MgF2 as abundant and environmentally friendly electrolytes for high performance electrochromic devices

Xi Chena, Wenjie Lib, Shuliang Doua, Lebin Wanga, Yingming Zhaoa, Xiang Zhanga( ), Yao Lia( ), Jiupeng Zhaob( )
Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

● The MgF2 film is used as the electrolyte to construct all solid state ECD with structure of glass/ITO/WO3/MgF2/NiO/ITO.

Abstract

Electrochromic devices (ECDs) can regulate the indoor solar radiation by adjusting optical transmissive properties, showing great commercial potential and important social value of green energy saving. However, the unsafety and high cost of Li+ based electrolyte hinder the large-scale and industrialized production of ECDs. Other metal ions have been used as electrolyte ions, but they are rarely reported in all solid state ECDs. In this study, MgF2 film is used as the solid electrolyte to construct all solid state ECD with the structure of glass/ITO/WO3/MgF2/NiO/ITO. The ECD shows the large optical modulation (~83% at 820 nm, with 100 s durations) and fast response (19.2 s for bleaching and 8.3 s for coloring, with 25 s durations). Moreover, the ECD achieves the extreme transmittance value of colored states Tc ≈ 0%, which can give an absolute private state. This work not only indicates that MgF2 film can be an alternative to Li+ based electrolyte in all solid state ECDs, but also broadens the applications of all solid state EC smart windows to private buildings.

Keywords

ElectrochromicAll solid stateSmart window

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Journal of Materiomics
Volume 7 Issue 6,
November 2021
Pages 1318-1323
DOI: 10.1016/j.jmat.2021.02.014
Cite this article:
Chen X, Li W, Dou S, et al. MgF2 as abundant and environmentally friendly electrolytes for high performance electrochromic devices. Journal of Materiomics, 2021, 7(6): 1318-1323. https://doi.org/10.1016/j.jmat.2021.02.014

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Received: 17 December 2020
Revised: 29 January 2021
Accepted: 21 February 2021
Published: 26 February 2021
© 2021 The Chinese Ceramic Society.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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