Smart Windows Prepared from <i>Bombyx mori</i> Silk

Pereira, Rui F. P.; Sentanin, F.; Pawlicka, Agnieszka; Gonçalves, M. C.; Silva, Maria Manuela; Bermúdez, V. de Zea

doi:10.1002/celc.201600095

Cited by 18 publications

(31 citation statements)

References 107 publications

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“…The rather unusual behavior observed leads us to suppose that in both samples something occurred in the 40–80 °C temperature range. Other authors [43] reported similar perturbations in the ionic conductivity behavior of the natural polymers‐based electrolytes with the increase of temperature. A competition between different factors such as the number of charge carriers, the mobility of the charge carriers, the recombination and/or aggregation of components, determines the final ionic conductivity of the electrolyte.…”

Section: Ionic Conductivitysupporting

confidence: 57%

Gellan‐Gum and LiTFSI‐Based Solid Polymer Electrolytes for Electrochromic Devices

et al. 2021

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It has been long recognized that solid polymer electrolytes (SPEs) are potentially interesting for solid‐state electrochemical devices. Gellan gum (Ge)‐based SPEs, plasticized with glycerol (Gly) and doped with lithium bis(trifluoromethanesulfone)imide (LiTFSI) were prepared by the solvent casting technique, and their properties were evaluated. LiTFSI‐based SPE systems exhibit, on the average, higher conductivities than similar systems with other lithium salts. The structure, morphology, complex impedance spectroscopy, cyclic voltammetry and thermal stability of the new electrolyte system were characterized. Electrochromic devices (ECDs) were built with optimized electrolyte samples and their performance was analyzed. The samples were applied in small ECDs with glass/ITO/CeO2‐TiO2/SPE/Prussian blue/ITO/glass configuration. The devices presented a two‐modulation operation: a semi‐bright mode (−2.5 V) and a dark mode (+0.5 V). The best results were obtained with the ECD containing the GeGly1Li2.4 electrolyte, for which the transmittance (T) values in the bleached and colored states were ca. 33.4/43.0 % and 5.4/8.8 % at 555/1000 nm, respectively. These results correspond to ΔT and ΔOD values of 28.0/34.2 % and 0.79/0.69, respectively, which give quite high CEin and CEout values of −4925 cm2 C−1 for bleaching (Qin=−272.1 μC cm−2), and 2062 cm2 C−1 for coloring (Qout=650.0 μC cm−2), at 630 nm. This electro‐optical performance suggests that the proposed SPE systems are promising materials to be further investigated and applied in ECDs.

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Section: Ionic Conductivitysupporting

confidence: 57%

Gellan‐Gum and LiTFSI‐Based Solid Polymer Electrolytes for Electrochromic Devices

et al. 2021

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“…In spite of the very high CE values produced, the ECD@LiTrif-[Er(tta) 3 (H 2 O) 2 ] device needs further improvements so that the ∆T and ∆OD values are substantially increased. At present, the addition of the same salt/complex mixture to cheap, abundant, and benign natural host polymers is being considered (e.g., proteins [39] or polysaccharides [24]) is being considered.…”

Section: Discussionmentioning

confidence: 99%

Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings

et al. 2018

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To address the challenges of the next generation of smart windows for energy-efficient buildings, new electrochromic devices (ECDs) are introduced. These include indium molybdenum oxide (IMO), a conducting oxide transparent in the near-infrared (NIR) region, and a NIR-emitting electrolyte. The novel electrolytes are based on a sol-gel-derived di-urethane cross-linked siloxane-based host structure, including short chains of poly (ε-caprolactone) (PCL(530) (where 530 represents the average molecular weight in g mol−1). This hybrid framework was doped with a combination of either, lithium triflate (LiTrif) and erbium triflate (ErTrif3), or LiTrif and bisaquatris (thenoyltrifluoroacetonate) erbium (III) ([Er(tta)3(H2O)2]). The ECD@LiTrif-[Er(tta)3(H2O)2] device presents a typical Er3+ NIR emission around 1550 nm. The figures of merit of these devices are high cycling stability, good reversibility, and unusually high coloration efficiency (CE = ΔOD/ΔQ, where Q is the inserted/de-inserted charge density). CE values of −8824/+6569 cm2 C−1 and −8243/+5200 cm2 C−1 were achieved at 555 nm on the 400th cycle, for ECD@LiTrif-ErTrif3 and ECD@LiTrif-[Er(tta)3(H2O)2], respectively.

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“…[73][74][75] This is in the condition that solid or gel electrolytes were most popular in research performed on ECDs. [69,76] Solid electrolytes are often polymeric consisting of a polymer as host, a salt or ionic liquid, solvents (acid or water), and additives such as glycerol as a plasticizer. The variety of available polymers and especially natural, environmentally friendly polymers, which are usable in devices, has increased the appealing of research in the field of SPEs.…”

Section: Electrolytementioning

confidence: 99%

Fundamentals and Advances of Electrochromic Systems: A Review

Isfahani

Silva

2021

Adv Eng Mater

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Electrochromic (EC) materials as one of the known types of smart materials have found many applications and therefore have recently been considered by many researchers and industries. Herein, after classifying these materials based on various properties such as chemical structure, optical properties, color, and applications explains how the EC-based systems work. Also, by introducing the widely used analyses in this field along with the different parameters and properties derived from them, using different examples from previous research, discusses the principles and advances of EC. Guidelines for further investigations are outlined.

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Smart Windows Prepared from Bombyx mori Silk

Cited by 18 publications

References 107 publications

Gellan‐Gum and LiTFSI‐Based Solid Polymer Electrolytes for Electrochromic Devices

Gellan‐Gum and LiTFSI‐Based Solid Polymer Electrolytes for Electrochromic Devices

Luminescent Electrochromic Devices for Smart Windows of Energy-Efficient Buildings

Fundamentals and Advances of Electrochromic Systems: A Review

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