Electrochromic Devices with Solid Electrolytes based on Natural Polymers

Pawlicka, Agnieszka; Dragunski, Douglas Cardoso; Guimaraes, K. V.; Avellaneda, César O.

doi:10.1080/15421400490482033

Cited by 41 publications

(15 citation statements)

References 15 publications

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“…No transmittance changes are observed in the near IR because of the light absortion. These results are comparable to those obtained with electrochromic devices built with starch-based electrolyte and lithium salt [22] and to electrochromic devices built with other polymeric electrolytes reported by Heusing and Aegerter [1]. The transmittance change presented in Fig.…”

Section: Electrochromic Devicessupporting

confidence: 94%

Solid-state electrochromic devices with Nb2O5:Mo thin film and gelatin-based electrolyte

Avellaneda

Vieira

Al-Kahlout

et al. 2007

Electrochimica Acta

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Section: Electrochromic Devicessupporting

confidence: 94%

Solid-state electrochromic devices with Nb2O5:Mo thin film and gelatin-based electrolyte

Avellaneda

Vieira

Al-Kahlout

et al. 2007

Electrochimica Acta

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“…For higher wavelengths, the difference between the colored and bleached states decreases and becomes practically zero at λ>1,400 nm. These results are comparable to ECDs containing starch-based electrolytes with lithium ionic conductivity [20] and to ECDs built with other polymer electrolytes listed by Heusing and Aegerter [4]. Figure 10 shows the change in the optical density measured at 550 nm of an ECD as a function of the number of chronoamperometric cycles performed with applied potentials of ±1.5 V for 60 s. The values increase continually during the first 1,000 cycles, pass a maximum of 0.11, and remain constant during the next 3,000 cycles.…”

Section: Characterization Of Electrochromic Devicessupporting

confidence: 89%

“…As examples, grafted hydroxyethylcellulose [13] and hydroxypropylcellulose [14], modified starch [15,16], chitosan [17,18], or gelatin [19] have been used to prepare electrolytes achieving Li + or H + ions conductivity values as high as 10 −5 S/cm at room temperature. Also, small ECDs with good color/bleaching properties have been already manufactured with these SPEs [15,20,21]. Promising results have also been obtained for 6×8 cm 2 ECDs with Nb 2 O 5 :Mo electrochromic coatings and gelatin-based electrolyte [22].…”

Section: Introductionmentioning

confidence: 91%

Gelatin-based protonic electrolyte for electrochromic windows

Al-Kahlout

Vieira

Avellaneda

et al. 2009

Ionics

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Proton-conducting gel polymer electrolytes based on gelatin plasticized with glycerol and containing acetic acid were investigated, characterized, and applied to electrochromic window. For glycerol contents varying from 7% to 48%, the conductivity of the uniform and predominantly amorphous gel electrolyte was found to follow a Vogel-Tamman-Fulcher behavior with the temperature. Typically, for the electrolyte chosen to make 7×2 cm 2 electrochromic smart window with the configuration: glass/ fluor-doped tin oxide (FTO)/WO 3 /gelatin electrolyte/CeO 2 -TiO 2 /FTO/glass and containing 28% of glycerol, the conductivities were found to be of the order of 5×10 −5 S/cm at room temperature and 3.6×10 −4 S/cm at 80°C. The device was characterized by spectroelectrochemical techniques and was tested up to 10,000 cycles showing a fast coloring/ bleaching behavior, where the coloring process was achieved in 10 s and the bleaching in 2 s. The transmission variation at the wavelength of 550 nm was about 15%. The cyclic voltammograms showed a very good reversibility of the cathodic/anodic processes, and the charge density was about 3.5 mC/cm 2 . The memory tests showed that the transmittance in the colored state increased by 8% in 90 min after removing the potential.

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“…In the starch samples the best quantity of glycerol was 30% in mass of starch [21]. Aiming to determine the optimal quantity of LiClO 4 [14].…”

Section: Resultsmentioning

confidence: 99%

“…The advantages of the polysaccharide precursor materials are their great availability in nature and, consequently, low price, which is important from the point of view of industrial application [14]. As they can be extracted from plants, such as wood, sugar cane bagasse, cotton fibres, etc., i.e., renewable sources, they consequently have biodegradable properties [15,16].…”

Section: Introductionmentioning

confidence: 99%

Conductivity and Thermal Analysis Studies of Solid Polymeric Electrolytes Based on Plasticized Hydroxyethyl Cellulose

2007

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Transparent film samples of hydroxyethyl cellulose (HEC) based on solid polymeric electrolytes (SPE) were prepared by the plasticization of HEC with glycerol and addition of lithium perchlorate salt. SPEs with different quantities of glycerol and LiClO 4 were studied by electrochemical impedance spectroscopy (EIS), Dynamic Mechanical Thermal Analysis (DMTA), TGA (Thermogravimetric Analysis) and DSC (Differential Scanning Calorimetry). The ionic conductivity measurements revealed that the sample containing [O]/[Li]=8 and 48% of glycerol showed the conductivity value of almost 10 -4 S/cm at room temperature. The TGA analysis of electrolytes with high plastizant and salt concentrations showed 25% weight loss after heating to 130 o C, which can be related to the liberation of absorbed water. Finally, DMTA measurements showed changes attributed to the glass transition (T g ) evidenced by the decrease in the elastic modulus value and peaks in the tanδ curves. These results demonstrated that HEC is a good material to be used as a matrix for new solid polymeric electrolytes.

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Electrochromic Devices with Solid Electrolytes based on Natural Polymers

Cited by 41 publications

References 15 publications

Solid-state electrochromic devices with Nb2O5:Mo thin film and gelatin-based electrolyte

Solid-state electrochromic devices with Nb2O5:Mo thin film and gelatin-based electrolyte

Gelatin-based protonic electrolyte for electrochromic windows

Conductivity and Thermal Analysis Studies of Solid Polymeric Electrolytes Based on Plasticized Hydroxyethyl Cellulose

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