Deep eutectic solvents (DESs) as low-cost and green electrolytes for electrochromic devices

Cruz, Hugo; Jordão, Noémi; Branco, Luı́s C.

doi:10.1039/c7gc00347a

Cited by 130 publications

(85 citation statements)

References 30 publications

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“…Thel owest operational voltage for coloration of the ChCl/MPG ECD is À0.4 V, which is much lower than the reported semi-solid ECD devices. [18] Thed ynamic response of the ChCl/MPG ECD is shown in Figure 5c.T he ChCl/MPG ECD showed ac oloration time of ca. 15 sa t À0.7 Vand ab leaching time of ca.…”

Section: Methodsmentioning

confidence: 99%

Supramolecular G4 Eutectogels of Guanosine with Solvent‐Induced Chiral Inversion and Excellent Electrochromic Activity

Peng

et al. 2020

Angew Chem Int Ed

102

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Supramolecular eutectogels,a ne merging class of materials that have just developed very recently,o ffer an ew opportunity for generating functional supramolecular gel materials in biocompatible anhydrous or low-water media. As the first example of supramolecular G4 eutectogels, complexes of natural guanosine and H 3 BO 3 exhibited excellent gelation capacity in choline chloride/alcohol deep eutectic solvents.T he as-prepared supramolecular eutectogels displayed unexpected solvent-induced chiral inversion and significantly high ionic conductivity (up to 7.78 mS cm À1), as well as outstanding thixotropic/injectable properties,h igh thermal stability and excellent electrochromic activity.T hese features make these versatile supramolecular G4 eutectogels promising candidates for developing next-generation flexible electronics with low environmental impact.

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Section: Methodsmentioning

confidence: 99%

Supramolecular G4 Eutectogels of Guanosine with Solvent‐Induced Chiral Inversion and Excellent Electrochromic Activity

Peng

et al. 2020

Angew Chem Int Ed

102

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“…Our group reported electrochromic materials and respective devices based on transition metal oxides, Prussian blue systems,, conducting polymers, and viologen derivatives,, among others. Recently, we already reported the application of DES as green electrolytes for electrochromism ,…”

Section: Figurementioning

confidence: 99%

“…In the anode could occurs the oxidation of the halogenated species, if the potential is the adequate one. While in the cathode, the viologen radical cation is electrogenerated (colored species) and it can stay adsorbed at the working electrode surface, independently of its nature (e. g. glassy carbon, gold, PET‐ITO or glass) and it is easier to oxidize . Possibly due to the low solubility of the electrogenerated radical cation in the electrolyte ,,.…”

Section: Figurementioning

confidence: 99%

Intrinsically Electrochromic Deep Eutectic Solvents

et al. 2019

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Multi-colored intrinsically electrochromic based Deep Eutectic Solvents (IEDES) have been firstly developed. IEDES composed by the suitable mixing between viologen salt derivatives as HBA and ethylene glycol (EG), glycerol (Gly) and poly(ethylene glycol) (PEG) as HBD have been prepared and characterized by thermal and electrochemical studies. A detailed electrochemical characterization of the IEDES using cyclic voltammetry studies in 2-electrodes (ECDs) configuration cells were performed. The most promissory IEDES based on viologen salt derivatives can act simultaneously as electrolyte and electrochromic. Preliminary redox cycling studies showed a reversible and stable ECD composed by [(C 5 O 2 ) 2 bpy]I 2 :EG at least until 1300 minutes. The coloration efficiency and reversibility can be tuned changing only the alcohol counterpart and/or the side chains and anion of the viologen derivatives. These IEDES can be explored as functional and efficient multi-colored ECDs. Also, these innovative materials can open attractive applications for material science and energy devices.

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“…Lately, a novel kind of ionic fluid known as deep eutectic solvents (DESs) [ 100 ], with physico-chemical properties comparable to those of ILs, but with better biodegradability and lower price and toxicity [ 100 ], have gained attention. DESs, formed by complexation between appropriate hydrogen bond acceptors and hydrogen bond donors, have been used as ecofriendly solvents or media [ 101 , 102 , 103 , 104 , 105 ] for the synthesis or deposition of EC materials (e.g., conducting polymers [ 106 , 107 , 108 ] or inorganic metal oxides [ 109 ]), and more recently as electrolyte for ECDs [ 110 , 111 ]. The latter, formed by interactions between hydrophilic silica and ethaline [ 110 ] or mixing choline chloride with ethylene glycol and glycerol [ 111 ], comprised viologens as EC materials and have shown suitable performance.…”

Section: Gel and Semisolid Electrolytes In Ecdsmentioning

confidence: 99%

All-in-One Gel-Based Electrochromic Devices: Strengths and Recent Developments

et al. 2018

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Electrochromic devices (ECDs) have aroused great interest because of their potential applicability in displays and smart systems, including windows, rearview mirrors, and helmet visors. In the last decades, different device structures and materials have been proposed to meet the requirements of commercial applications to boost market entry. To this end, employing simple device architectures and achieving a competitive electrolyte are crucial to accomplish easily implementable, high-performance ECDs. The present review outlines devices comprising gel electrolytes as a single electroactive layer (“all-in-one”) ECD architecture, highlighting some advantages and opportunities they offer over other electrochromic systems. In this context, gel electrolytes not only overcome the drawbacks of liquid and solid electrolytes, such as liquid’s low chemical stability and risk of leaking and soil’s slow switching and lack of transparency, but also exhibit further strengths. These include easier processability, suitability for flexible substrates, and improved stabilization of the chemical species involved in redox processes, leading to better cyclability and opening wide possibilities to extend the electrochromic color palette, as discussed herein. Finally, conclusions and outlook are provided.

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Deep eutectic solvents (DESs) as low-cost and green electrolytes for electrochromic devices

Abstract: The application of deep eutectic solvents based on choline chloride or lithium chloride with ethylene glycol and glycerol as low-cost, recyclable and green electrolytes for electrochromic devices is reported.

Cited by 130 publications

References 30 publications

Supramolecular G4 Eutectogels of Guanosine with Solvent‐Induced Chiral Inversion and Excellent Electrochromic Activity

Supramolecular G4 Eutectogels of Guanosine with Solvent‐Induced Chiral Inversion and Excellent Electrochromic Activity

Intrinsically Electrochromic Deep Eutectic Solvents

All-in-One Gel-Based Electrochromic Devices: Strengths and Recent Developments

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