Electrochromic properties of ITO nanoparticles/viologen composite film electrodes

Nakajima, Ryota; Yamada, Yuya; Komatsu, Tatsuya; Murashiro, Katsuyuki; Saji, Tetsuo; Hoshino, Katsuyoshi

doi:10.1039/c2ra01090a

Cited by 19 publications

(11 citation statements)

References 32 publications

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“…For all the DES successfully used as the electrolyte for the viologen derivatives, a well-defined electron transfer at approximately 0 V is observed in both cathodic and anodic back scans, and this could be related to an oxidation process that does not lead to a color change or an adsorption process at the electrode surface. − …”

Section: Resultsmentioning

confidence: 98%

Deep Eutectic Solvents as Suitable Electrolytes for Electrochromic Devices

Cruz

Jordão

Amorim

et al. 2018

ACS Sustainable Chem. Eng.

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The development of chloride free Deep Eutectic Solvents (DES) based on lithium acetate, triflate, bistriflimide, and sodium triflate combined with glycerol, ethylene glycol, and polyethylene glycol (PEG400) as suitable electrolytes was successfully applied in electrochromic devices (ECD). Reversible ECD incorporating selected DES as electrolyte and bipyridinium as electrochromic probes displayed a comparable performance to conventional systems, with slower transition times (2.5 times), improving the coloration contrast and efficiency (147.1 cm2. C−1 at 520 nm) and was stable for at least 1250 redox cycles.

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Section: Resultsmentioning

confidence: 98%

Deep Eutectic Solvents as Suitable Electrolytes for Electrochromic Devices

Cruz

Jordão

Amorim

et al. 2018

ACS Sustainable Chem. Eng.

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“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18] Until recently, most of the applications have been based on the optical changes in the visible spectrum, whereas the infrared (IR) region is still rare. 4,[19][20][21][22][23][24][25][26] Electrochromic materials can be also used in the IR region, such as infrared camouflage and thermal control of satellites. 27,28 Tungsten trioxide (WO 3 ) has been identified as one of the most promising inorganic electrochromic materials due to its outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical structure Ti-doped WO3 film with improved electrochromism in visible-infrared region

et al. 2013

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Hierarchical structure Ti-doped WO 3 thin films are prepared by a template-free hydrothermal method. The influence of Ti doping on the electrochromic properties of WO 3 thin films is investigated in the visibleinfrared region. Ti doping can lead to significant surface morphology change and lower the crystallization, which plays an important role in the electrochromic properties of WO 3 films. The large transmittance modulation (49.1% at 750 nm, 64.6% at 2000 nm and 59.3% at 10 mm), fast switching speed (1.7 s and 1.6 s) and high coloration efficiency (68 cm 2 C 21 at 750 nm) are achieved for the low Ti-doped WO 3 film. The enhancement in the electrochromic performance of the low Ti-doped WO 3 films is attributed to their low crystallization, a star-like structure which has low charge transfer and ion diffusion resistance, leading to superior electrical conductivity and reaction kinetics.

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“…3−13 Moreover, it was reported that an electrode prepared simply by mixing indium tin oxide (ITO) nanoparticles and a hydrophobic viologen compound showed good electrochromic performance in an aqueous electrolyte. 14 In this report, the good performance was attributed to the specific feature of the nanospaces constructed by the ITO nanoparticles because the single film of hydrophobic viologen coated on an ITO plate substrate exhibited no electrochemical activity in the aqueous electrolyte: 15 the wide surface area of the nanospaces was considered to inhibit the recrystallization of the viologen cation radical dimers into aggregates that were prevented from returning to the original oxidized state. In addition, the hydrophilic property of the nanospaces enabled ions to freely enter and exit the nanospaces without being purged by the hydrophobic viologen.…”

Section: Introductionmentioning

confidence: 95%

Electrochromic Properties of Metal Oxide Nanoparticles/Viologen Composite Film Electrodes

2018

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Electrochromic substances supported on metal oxide nanoparticle layers have found application in electrodes for electronic paper and smart windows. In addition to applications of technological importance, the nanospaces created by the nanoparticles are scientifically important as they provide specific electrochemical reaction fields. Herein, the electrochromic properties of the composite film electrodes consisting of viologen and a metal oxide (SnO2, Al-doped ZnO, and ZnO) on an indium tin oxide (ITO)-coated glass plate were investigated. All the electrodes exhibited electrochromism ranging from purple to white (or yellowish-white). However, the coloring uniformity, coloring concentration, and response times of coloring/decoloring depended on the nature of the nanoparticles, the reason for which is discussed on the basis of the difference in the mixing state of the nanoparticle–viologen system and the difference in the hydrophilicity of the nanospaces. The SnO2–viologen/ITO electrode demonstrated the most promising electrochromic performance. The ZnO–viologen/ITO electrode exhibited specific electrochromism in that the supported amount of viologen was controlled by pre-exposure to white light, thereby allowing image patterns and gradation images to display electrochromic behavior. Finally, an indium-free electrode, SnO2–viologen/FTO (fluorine-doped tin oxide-coated glass plate), was prepared. Reflecting the higher chemical affinity of SnO2 for FTO, the electrode demonstrated the highest electrochromic performance.

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Electrochromic properties of ITO nanoparticles/viologen composite film electrodes

Cited by 19 publications

References 32 publications

Deep Eutectic Solvents as Suitable Electrolytes for Electrochromic Devices

Deep Eutectic Solvents as Suitable Electrolytes for Electrochromic Devices

Hierarchical structure Ti-doped WO3 film with improved electrochromism in visible-infrared region

Electrochromic Properties of Metal Oxide Nanoparticles/Viologen Composite Film Electrodes

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