High-Performance and Stability Electrochromic Devices with a Water Isotopologue

Muyun Li; Haoyang Yan; Sifan Kong; Honglong Ning; Chenxiao Guo; Xinglin Li; Tian Qiu; Cheng Luo; Rihui Yao; Junbiao Peng

doi:10.1021/acs.jpclett.3c02288

High-Performance and Stability Electrochromic Devices with a Water Isotopologue

J Phys Chem Lett. 2023 Nov 2;14(43):9677-9682. doi: 10.1021/acs.jpclett.3c02288. Epub 2023 Oct 23.

Authors

Muyun Li¹, Haoyang Yan¹, Sifan Kong², Honglong Ning¹, Chenxiao Guo¹, Xinglin Li¹, Tian Qiu³, Cheng Luo⁴, Rihui Yao¹, Junbiao Peng¹

Affiliations

¹ Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
² School of Software, South China Normal University, Foshan 528225, China.
³ Department of Intelligent Manufacturing, Wuyi University, Jiangmen 529020, China.
⁴ School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, China.

PMID: 37870981
DOI: 10.1021/acs.jpclett.3c02288

Abstract

In this report, an ammonium metatungstate (AMT) and ferrous chloride [Fe(II)Cl₂] electrochromic liquid (ECL) was synthesized using a hydrothermal method, with D₂O used as the solvent instead of H₂O. The results show that the use of D₂O can improve the stability and performance of ECLs. The hydrogen evolution process in electrochromic devices (ECDs) filled with ECL becomes more difficult, while the material exchange process becomes easier. The ECD exhibits a color modulation amplitude of 58%@680 nm at 2 V. After 500 cycles, the device's performance remains above 95% at a current density of 1.5 mA/cm². Hydrogen bonds in D₂O solutions are expected to exhibit stronger forces compared to those in regular H₂O solutions. Therefore, we hypothesize that enhancing the strength of hydrogen bonds in H₂O solutions is an effective approach for improving the performance and stability of electrochromic solutions.