Achieving low-driving voltage electrochromic devices with N-methylphenothiazine derived ionic liquid
Journal
Chemical Engineering Journal
Journal Volume
420
Date Issued
2021
Author(s)
Abstract
A novel N-methylphenothiazine based ionic liquid (NMP-IL) was designed for achieving low-driving voltage electrochromic device (ECD) with thermal durability. NMP-IL was synthesized via a five-step reaction, including thionation, methylation, substitution, ionization, and anion exchange. By chemically bonding with the ionic liquid, NMP-IL exhibited a large optical contrast and high thermal stability simply to take the advantages of both NMP and ionic liquid features. Compared to NMP, NMP-IL would provide the electrolyte with a higher ionic conductivity, thus reducing the driving voltage of the ECDs. Most importantly, an extremely low-driving voltage (0.6 V) ECD based on NMP-IL and nickel hexacyanoferrate (NiHCF) thin film, known as the ion storage layer, was further demonstrated. The proposed NMP-IL/NiHCF ECD accomplished a large transmittance change of 56.6% at 575 nm, a desirable coloration efficiency of 166 cm2/C, and attenuated 120.9 W/m2 solar irradiance between bleached state and colored state with a minimal consumed power per unit area of 1.08 W/m2. Besides, impressive long-term stabilities of the proposed ECDs, under both room temperature (92.3% retention of its original ΔT after 10,000 cycles) and high temperature (80.2% retention of its original ΔT after 3,000 cycles at 65 °C), were achieved. These merits reveal that NMP-IL has the potential to become the new anodically coloring material for application in energy-saving ECDs. ? 2021 Elsevier B.V.
Subjects
Alkylation; Electrochromic devices; Electrolytes; Energy conservation; Ion exchange; Ionic liquids; Negative ions; Anion exchange; Electrochromic device; Electrochromics; Low driving voltage; N-methylphenothiazine; Nickel hexacyanoferrate; Redox ionic liquid; Synthesised; Thermal durability; Thionation; Electrochromism
SDGs
Other Subjects
Alkylation; Electrochromic devices; Electrolytes; Energy conservation; Ion exchange; Ionic liquids; Negative ions; Anion exchange; Electrochromic device; Electrochromics; Low driving voltage; N-methylphenothiazine; Nickel hexacyanoferrate; Redox ionic liquid; Synthesised; Thermal durability; Thionation; Electrochromism
Type
journal article