Electrochromic devices constructed with water-in-salt electrolyte enabling energy-saving and prolonged optical memory effect

Wu, Wenting1; Wu, Lingqi1; Ma, Hailong1; Wu, Liangliang2; Wang, Hong2,3,4; Fang, Huajing1

2022-10-15

10.1016/j.cej.2022.137122

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

Electrochromism, a promising energy conversion technology, has shown enormous prospects in various energy efficient applications. The novel Zn2+ based aqueous electrochromic system exhibits self-coloration and large transmittance modulation, while the performance is stagnated by the limited bleaching voltage causing poor kinetics of the reaction. To clear the obstacles of trapped zinc ions and short lifetime, the emerging water-in-salt (WIS) electrolytes of Zn2+ were introduced into tungsten oxide-based electrochromic devices for the first time. The ZnCl2 WIS electrolyte leads to an expanded electrochemical stability window up to 2.4 V by suppressing the electrolysis of water molecules. The electrochromic device with ZnCl2 WIS electrolyte shows enhanced performance of large transmittance modulation of 64% at 660 nm, a short response time (4.8/3.6 s for coloring/ bleaching), and high cyclic stability when compared with that of 2 M ZnCl2 aqueous electrolyte. The enhanced performance is further revealed by the theoretical analyses and numerical simulation of the ion transportation kinetics in the electrochromic layer. Moreover, a patterned electrochromic display is fabricated by a simple brush-painting method. The display utilizing ZnCl2 WIS electrolyte yields a prolonged optical memory effect compared to that with 2 M ZnCl2, where the content of this display is still visible even after three days without external energy consumption. This work presents good feasibility for electrolyte design strategy and provides an attractive electrolyte candidate for high-performance electrochromic applications.

Water-in-salt electrolyte Electrochromic device Tungsten oxide Optical memory effect Energy-saving display

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51902250] ; Fundamental Research Funds for the Central Universities[xzy012019002] ; Guangdong Provincial Key Laboratory Program[xzy012019002] ; Natural Science Basic Research Plan in Shaanxi Province of China[2021B1212040001] ; Shenzhen Science and Technology Program[2020JQ-035] ; Shenzhen DRC project[KQTD20180411143514543] ; Central Universities[[2018] 1433]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000806378200004

ELSEVIER SCIENCE SA

20222212186504

Chlorine compounds ; Electrochromic devices ; Electrochromism ; Electrolytes ; Energy efficiency ; Energy utilization ; Light ; Modulation ; Molecules ; Negative ions ; Reaction kinetics ; Trapped ions ; Tungsten compounds

Energy Conservation:525.2 ; Energy Utilization:525.3 ; Electricity: Basic Concepts and Phenomena:701.1 ; Electric Batteries and Fuel Cells:702 ; Electronic Components and Tubes:714 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Atomic and Molecular Physics:931.3

ENGINEERING

Web of Science

1.Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xi'an 710049, Peoples R China
2.Xi An Jiao Tong Univ, Sch Elect & Informat Engn, State Key Lab Mech Behav Mat, Xi'an 710049, Peoples R China
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Engn Res Ctr Novel Elect Informat Mat & D, Shenzhen 518055, Peoples R China

Wu, Wenting,Wu, Lingqi,Ma, Hailong,et al. Electrochromic devices constructed with water-in-salt electrolyte enabling energy-saving and prolonged optical memory effect[J]. CHEMICAL ENGINEERING JOURNAL,2022,446.

Wu, Wenting,Wu, Lingqi,Ma, Hailong,Wu, Liangliang,Wang, Hong,&Fang, Huajing.(2022).Electrochromic devices constructed with water-in-salt electrolyte enabling energy-saving and prolonged optical memory effect.CHEMICAL ENGINEERING JOURNAL,446.

Wu, Wenting,et al."Electrochromic devices constructed with water-in-salt electrolyte enabling energy-saving and prolonged optical memory effect".CHEMICAL ENGINEERING JOURNAL 446(2022).