Polyol Synthesis of Ti-V<sub>2</sub>O<sub>5</sub> Nanoparticles and Their Use as Electrochromic Films

Salek, Guillaume; Bellanger, Brice; Mjejri, Issam; Gaudon, Manuel; Rougier, Aline

doi:10.1021/acs.inorgchem.6b01662

Cited by 25 publications

(16 citation statements)

References 41 publications

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“…Electrochromic V 2 O 5 coatings have been prepared by electrodeposition [11,12], "Doctor Blade" [13], reactive sputtering [14], polyol process [15], sol-gel [16], and hydrothermal growth [17]. Strategies…”

Section: Introductionmentioning

confidence: 99%

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Vernardou

2017

Coatings

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Vanadium pentoxide coatings were grown by atmospheric pressure chemical vapor deposition varying the gas precursor ratio (vanadium (IV) chloride:water) and the substrate temperature. All samples were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, cyclic voltammetry, and transmittance measurements. The water flow rate was found to affect the crystallinity and the morphological characteristics of vanadium pentoxide. Dense stacks of long grains of crystalline oxide are formed at the highest amount of water utilized for a substrate temperature of 450 • C. Accordingly, it was indicated that for higher temperatures and a constant gas precursor ratio of 1:7, the surface morphology becomes flattened, and columnar grains of uniform size and shape are indicated, keeping the high crystalline quality of the material. Hence, it was possible to define a frame of operating parameters wherein single-phase vanadium pentoxide may be reliably expected, including a gas precursor ratio of 1:7 with a substrate temperature of >450 • C. The as-grown vanadium pentoxide at 550 • C for a gas precursor ratio of 1:7 presented the best electrochemical performance, including a diffusion coefficient of 9.19 × 10 −11 cm 2 ·s −1 , a charge density of 3.1 mC·cm −2 , and a coloration efficiency of 336 cm 2 ·C −1 . One may then say that this route can be important for the growth of large-scale electrodes with good performance for electrochromic devices.

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Section: Introductionmentioning

confidence: 99%

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Vernardou

2017

Coatings

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“…Both the redox potential and redox capacity of Co 3+ ions are different in the two oxides [44]. Considering that Ti substitution in V 2 O 5 can alter the electronic structure of its original framework [45,46], it is very likely that the V ions in the V-Ti-O structure have a different redox behavior from those in V 2 O 5 . However, because it is difficult to analyze the band structure of amorphous materials, it is still unclear why the V ions in aVTO show a higher electron-accepting ability.…”

Section: +mentioning

confidence: 99%

Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

Lee¹,

Chae²,

Chae³

et al. 2016

Journal of Electrochemical Science and Technology

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Amorphous vanadium titanates (aVTOs) are examined for use as a negative electrode in lithium-ion batteries. These amorphous mixed oxides are synthesized in nanosized particles (<100 nm) and flocculated to form secondary particles. The V ). The discrepancy seems to be due to the unique four-coordinated V 5 + ions in aVTO, which either are more electron-accepting or generate more structural defects that serve as Li + storage sites. Coin-type Li/aVTO cells show a large irreversible capacity in the first cycle. When they are prepared under nitrogen (aVTO-N), the population of surface hydroxyl groups is greatly reduced. These groups irreversibly produce highly resistive inorganic compounds (LiOH and Li 2 O), leading to increased irreversible capacity and electrode resistance. As a result, the material prepared under nitrogen shows higher Coulombic efficiency and rate capability.

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“…Smart windows are based on electrochromic materials that block solar and indoor sunlight and heat, enabling a reduction in the energy required for air conditioning [ 7 ]. A wide variety of ECD materials have been studied, including transition metal oxides, such as nickel oxide (NiO), tungsten oxide (WO 3 ), zinc oxide (ZnO), and vanadium oxide (V 2 O 5 ) [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Applied IrO2 Buffer Layer as a Great Promoter on Ti-Doping V2O5 Electrode to Enhance Electrochromic Device Properties

Chen

et al. 2022

Materials

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Electrochromic devices (ECDs) are a promising material for smart windows that are capable of transmittance variation. However, ECDs are still too expensive to achieve a wide market reach. Reducing fabrication cost remains a challenge. In this study, we inserted an IrO2 buffer layer on Ti-doped V2O5 (Ti:V2O5) as a counter electrode using various Ar/O2 gas flow ratios (1/2, 1/2.5, 1/3 and 1/3.5) in the fabrication process. The buffered-ECD resulted in a larger cyclic voltammetry (CV) area and the best surface average roughness (Ra = 3.91 nm) to promote electrochromic performance. It was fabricated using the low-cost, fast deposition process of vacuum cathodic arc plasma (CAP). This study investigates the influence of the IrO2 buffer/Ti:V2O5 electrode on ECD electrochemical and optical properties, in terms of color efficiency (CE) and cycle durability. The buffered ECD (glass/ITO/WO3/liquid electrolyte/IrO2 buffer/Ti:V2O5/ITO/glass) demonstrated excellent optical transmittance modulation; ∆T = 57% (from Tbleaching (67%) to Tcoloring (10%)) at 633 nm, which was higher than without the buffer (ITO/WO3/liquid electrolyte/Ti:V2O5/ITO) (∆T = 36%). In addition, by means of an IrO2 buffer, the ECD exhibited high coloration efficiency of 96.1 cm2/mC and good durability, which decayed by only 2% after 1000 cycles.

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Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films

Cited by 25 publications

References 41 publications

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

Applied IrO2 Buffer Layer as a Great Promoter on Ti-Doping V2O5 Electrode to Enhance Electrochromic Device Properties

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Polyol Synthesis of Ti-V2O5 Nanoparticles and Their Use as Electrochromic Films

Cited by 25 publications

References 41 publications

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Using an Atmospheric Pressure Chemical Vapor Deposition Process for the Development of V2O5 as an Electrochromic Material

Amorphous Vanadium Titanates as a Negative Electrode for Lithium-ion Batteries

Applied IrO2 Buffer Layer as a Great Promoter on Ti-Doping V2O5 Electrode to Enhance Electrochromic Device Properties

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Polyol Synthesis of Ti-V₂O₅ Nanoparticles and Their Use as Electrochromic Films