Semi-solid state electrochromic device based on deep eutectic solvent gel electrolyte and transparent Au modified FTO electrode

Wang, Rong; Shengxia, ZHANG; Su, Yun; Liu, Junxia; Ye, Ying; Wang, Feng; Cao, Xiaowei

doi:10.1016/j.electacta.2017.11.052

Cited by 24 publications

(17 citation statements)

References 57 publications

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“…Due to the risk of electrolyte leakage and the difficulty of manufacturing and handling, solid‐state or semi‐solid (i. e., gel) electrolyte based ECDs gradually replace the liquid‐state based ECDs . However, solid polymer electrolyte in solid‐state ECDs has low ionic conductivity, poor contact at electrode/electrolyte interface and its preparation process need organic solvent .…”

Section: Introductionmentioning

confidence: 99%

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Yang

Zhou

et al. 2018

ChemElectroChem

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The new, sustainable, and pro‐environmental electrochromic devices (ECDs) have attracted tremendous attention due to the current issues regarding energy sources consumption and environmental pollution. A free‐standing composite film, consisting of cellulose nanocrystals (CNCs) as biological matrix, viologen, and KCl, was prepared by a casting method. Such a composite film is flexible and can be tailored into various shapes for patterned applications. The viologen/KCl/CNCs film was sandwiched between two indium‐tin oxide (ITO) glasses to construct viologen‐based ECDs. The performance of the viologen‐based ECDs did not depend on the organic solvent. ECDs based on four kinds of viologens with different substituent groups exhibited distinct coloration response. Besides the nature of the substituent groups attached to the bipyridine rings, the presence of CNCs is a crucial factor that affects the electrochromic performance of ECDs. The dimethyl‐substituted viologen ECD has a fast response time (10 s for bleaching and 7.3 s for coloring). And for the dibenzyl‐substituted viologen, a low voltage of −2.2 V can drive the coloration of its ECDs. The diethyl‐substituted viologen ECD exhibits 30 % transmittance variation and good coloring/bleaching stability. The ability to be tailored and degradability of the composite film provides a feasible strategy for the sustainability of electrochromic displays.

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Section: Introductionmentioning

confidence: 99%

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Yang

Zhou

et al. 2018

ChemElectroChem

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“…Rather than employing thin solid films as the active, electrochromic layers, Wang et al [ 40 ] opted to introduce the electrochromic agents, namely a mixture of ethyl-viologen dibromide and potassium ferrocyanide, into a deep eutectic solvent gel electrolyte. The electrochromic system was investigated in the form of a gel electrolyte layer sandwiched between two Au-modified FTO electrodes.…”

Section: Pursuing the Goalmentioning

confidence: 99%

Transparent to Black Electrochromism—The “Holy Grail” of Organic Optoelectronics

2019

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In the rapidly developing field of conjugated polymer science, the attribute of electrochromism these materials exhibit provides for a multitude of innovative application opportunities. Featuring low electric potential driven colour change, complemented by favourable mechanical and processing properties, an array of non-emissive electrochromic device (ECD) applications lays open ahead of them. Building up from the simplest two-colour cell, multielectrochromic arrangements are being devised, taking advantage of new electrochromic materials emerging at a fast pace. The ultimate device goal encompasses full control over the intensity and spectrum of passing light, including the two extremes of complete and null transmittance. With numerous electrochromic device architectures being explored and their operating parameters constantly ameliorated to pursue this target, a summary and overview of developments in the field is presented. Discussing the attributes of reported electrochromic systems, key research points and challenges are identified, providing an outlook for this exciting topic of polymer material science.

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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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Semi-solid state electrochromic device based on deep eutectic solvent gel electrolyte and transparent Au modified FTO electrode

Cited by 24 publications

References 57 publications

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Transparent to Black Electrochromism—The “Holy Grail” of Organic Optoelectronics

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

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