Study of ionically conducting nanocomposites for reflective electrochromic devices

Sentanin, F.; Sabadini, R. C.; Barros, Sandra Cerqueira; Caliman, Willian R.; Cavalheiro, Carla Cristina Schmitt; Kanicki, Jerzy; Donoso, José Pedro; Magon, Cláudio José; Silva, I.D.A.; Silva, M.M.; Pawlicka, Agnieszka

doi:10.1016/j.electacta.2019.01.130

Cited by 12 publications

(8 citation statements)

References 37 publications

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“…This was observed in the present study, where no d(001) peaks below 2θ = 10° were seen for the samples with 1 wt% of SCa-3-Li + and 5 wt% of SCa-3-Na + , suggesting their exfoliated structures [ 21 ]. This behavior was already observed in NPEs of gelatin loaded with 1–15 wt% of SCa-3-Na + (Li + ) [ 20 ]. At 5 wt% of SCa-3-Li + ( Figure 1 b) and at 10 wt% of SCa-3-Na + ( Figure 1 a), small peaks start to emerge, in the 2θ = 9–40° range, over this large band centered at 20.5°.…”

Section: Resultssupporting

confidence: 64%

“…As previously published, SCa-3-Na + and SCa-3-Li + presented peaks at 2θ = 7.2 and 6.7°, corresponding to plan (001) and interlamellar spacings of 12.3 and 12.8 Å, respectively [ 20 ]. The difference in the values between the two clays was probably due to the efficient cationic exchange [ 20 , 21 ] and better polymer-clay interaction, leading to an increase in interlamellar distance, seen as a shift of d(001) plane characteristic peak to a smaller angle. Alginate powder and Alg-based NPEs with no clay have only one large band centered at 2θ = 20.5°, indicating their semicrystalline structures [ 22 ].…”

Section: Resultsmentioning

confidence: 58%

“…While these crystalline peaks did not change much for Alg-based NPEs with SCa-3-Li + , the NPE sample with 20 wt% of SCa-3-Na + developed four peaks in 2θ = 10–35° range. Therefore, Alg-based NPEs with SCa-3-Na + (Li + ) have shown a change from exfoliated to intercalated structures with the increase of the quantity of clay, which resembles the samples of gelatin-based NPEs with montmorillonite [ 20 ] and poly(methylmethacrylate) (PMMA)/MMT [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic peaks of alginate uronic acid functional groups were detected at 924 cm −1 and mannuronic acid at around 852 cm −1 [ 22 ]. The montmorillonite clay characteristic bands are in the same range of wavenumbers, where the peak at 993 cm −1 corresponds to Si-O-Si stretching, at 912 cm −1 to Al-Al-OH deformation, and at 617 cm −1 to coupled Al-O and Si-O out of plane [ 20 ]. Therefore, probably the montmorillonite peaks are overlapped with alginate.…”

Section: Resultsmentioning

confidence: 99%

“…As a comparison, the Alg-based electrolyte with 0 wt% of clay had 89% of transmittance at 600 nm. These measures were done qualitatively, because the thicknesses of the samples varied between 0.04–0.10 mm ( Table 1 ), even though we can affirm that the addition of clay decreased samples’ transparency [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

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Nanocomposite Polymer Electrolytes of Sodium Alginate and Montmorillonite Clay

et al. 2021

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Nanocomposite polymer electrolytes (NPEs) were synthesized using sodium alginate (Alg) and either sodium (SCa-3-Na+)- or lithium (SCa-3-Li+)-modified montmorillonite clays. The samples were characterized by structural, optical, and electrical properties. SCa-3-Na+ and SCa-3-Li+ clays’ X-ray structural analyses revealed peaks at 2θ = 7.2° and 6.7° that corresponded to the interlamellar distances of 12.3 and 12.8 Å, respectively. Alg-based NPEs X-ray diffractograms showed exfoliated structures for samples with low clay percentages. The increase of clay content promoted the formation of intercalated structures. Electrochemical Impedance Spectroscopy revealed that Alg-based NPEs with 5 wt% of SCa-3-Na+ clay presented the highest conductivity of 1.96 × 10−2 S/cm2, and Alg with 10 wt% of SCa-3-Li+ showed conductivity of 1.30 × 10−2 S/cm2, both measured at 70 °C. From UV-Vis spectroscopy, it was possible to infer that increasing concentration of clay promoted a decrease of the samples’ transmittance and, consequently, an increase of their reflectance.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nanocomposite Polymer Electrolytes of Sodium Alginate and Montmorillonite Clay

et al. 2021

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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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A Highly Stable and Tunable Visible‐Near‐IR Electrochromic All‐in‐One Gel Device

Ling

Tian

et al. 2020

ChemPhotoChem

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Energy saving is a global topic of critical importance. Electrochromic devices (ECDs) could be used to control energy flow by modulating the light absorption reversibly upon application of a small potential bias. Herein, a visible‐NIR dual‐band ECD based on the viologen analogue 4, 4′‐(thiophene‐2, 5‐diyl) bis(1‐methylpyridin‐1‐ium) diiodide (TMP) was assembled with a simple all‐in‐one configuration. The TMP‐based gel ECD possesses high dynamic contrast (81.7 % at 570 nm, 68.6 % at 835 nm, 62.8 % at 910 nm and 55.3 % at 1046 nm), excellent cyclic stability (70.6 % of ▵T at 570 nm maintained after 25000 cycles at 1.4 V), and low power consumption (15.2 mJ/cm2 to complete the coloring process, 2.5 mW/cm2 to keep color and low transmittance). Remarkably, the absorption of visible and NIR light could be selectively adjusted by varying the coloring time. For comparison, a dimethyl viologen (DMV)‐based gel ECD was fabricated, and the SAR (structure‐activity relationship) was established by cyclic voltammetry, density functional theory (DFT) calculations, and other electrochromic performance parameters.

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Study of ionically conducting nanocomposites for reflective electrochromic devices

Cited by 12 publications

References 37 publications

Nanocomposite Polymer Electrolytes of Sodium Alginate and Montmorillonite Clay

Nanocomposite Polymer Electrolytes of Sodium Alginate and Montmorillonite Clay

Fundamentals and Advances of Electrochromic Systems: A Review

A Highly Stable and Tunable Visible‐Near‐IR Electrochromic All‐in‐One Gel Device

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