Influence of Dopant Concentration on the Electrochromic Properties of Tungsten Oxide Thin Films

Meenakshi, M.; Gowthami,; Perumal, Packiyaraj; Sivakumar, R.; Sanjeeviraja, C.

doi:10.1016/j.electacta.2015.05.187

Cited by 66 publications

(15 citation statements)

References 72 publications

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“…The calculated diffusion coefficients of Li + insertion are 2.78 × 10 −11 and 1.80 × 10 −11 cm 2 s −1 with and without MXene addition, respectively. Also, diffusion coefficients of Li + extraction are 1.04 × 10 −10 and 5.52 × 10 −11 cm 2 s −1 with and without MXene addition, which show the quantitative agreement with the previous studies [63,64]. The lithium ion insertion/extraction speed into the electrochromic film is evidently enhanced by the addition of MXene.…”

Section: Configuration and Performances Of The Electrochromic Devicessupporting

confidence: 90%

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Fang

et al. 2020

Nano-Micro Lett.

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Electrochromic technology plays a significant role in energy conservation, while its performance is greatly limited by the transport behavior of ions and electrons. Hence, an electrochromic system with overall excellent performances still need to be explored. Initially motivated by the high ionic and electronic conductivity of transition metal carbide or nitride (MXene), we design a feasible procedure to synthesize the MXene/WO3−x composite electrochromic film. The consequently boosted electrochromic performances prove that the addition of MXene is an effective strategy for simultaneously enhancing electrons and ions transport behavior in electrochromic layer. The MXene/WO3−x electrochromic device exhibits enhanced transmittance modulation and coloration efficiency (60.4%, 69.1 cm2 C−1), higher diffusion coefficient of Li+ and excellent cycling stability (200 cycles) over the pure WO3−x device. Meanwhile, numerical stimulation theoretically explores the mechanism and kinetics of the lithium ion diffusion, and proves the spatial and time distributions of higher Li+ concentration in MXene/WO3−x composite electrochromic layer. Both experiments and theoretical data reveal that the addition of MXene is effective to promote the transport kinetics of ions and electrons simultaneously and thus realizing a high-performance electrochromic device. This work opens new avenues for electrochromic materials design and deepens the study of kinetics mechanism of ion diffusion in electrochromic devices.

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Section: Configuration and Performances Of The Electrochromic Devicessupporting

confidence: 90%

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Fang

et al. 2020

Nano-Micro Lett.

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“…The dominant 38.2 eV/36.1 eV double peak of W VI and the weaker 36.9 eV/34.7 eV double peak attributed to W V suggest the presence of oxygen vacancies in the sample. Through the above characterization, the a-WO 3 layer in the a-WO 3 ECE exhibits a loose and porous feature from the microscopic to mesoscopic scale, facilitating ion migration during the coloring/bleaching process. − …”

Section: Resultsmentioning

confidence: 99%

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices

Xie

Wang

Khalifa

et al. 2023

ACS Appl. Mater. Interfaces

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Aqueous electrolytes possess non-combustible and eco-friendly features compared to organic electrolytes, leading them to be more suitable for application in smart windows for daily use. However, limited by the narrow electrochemical window of water (1.23 V), its use in conventional electrochromic devices (ECDs) would result in irreversible performance loss, which arises from decomposition caused by high voltage. Here, we propose a synergistic scheme combining a redox couple-catalytic counter electrode (RC-CCE) strategy with protons as guest ions. With the help of the intelligent matching of the reaction potentials of the RC and amorphous WO 3 electrochromic electrodes and the highly active and fast kinetic features of protons, it successfully reduces the working voltage range of the device to 1.1 V. The assembled HClO 4 -ECD can possess an overall modulation rate (350−1200 nm) of 0.43 and 0.94 at −0.1 and −0.7 V, respectively, and a modulation of 66.8% at 600 nm at −0.7 V. Moreover, compared with other guest ions, the proton-based ECD exhibits higher coloration efficiency, a broader color modulation capability, and better stability. In addition, the house model equipped with the proton-based ECD effectively blocks solar radiation, which provides a potential solution for the design of aqueous smart windows.

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“…Compared with the switching time of 11.7 and 14.6 s for coloring and bleaching, respectively, of bare WO 3 , those were 7.2 and 2.2 s for 5% Fe-doped WO 3 . WO 3 films doped with C [134], N [135], P [136], Ni [126,137], Mo [138,139], Co [140], Sb [141], Ag [142], Au [143], Gd [144], Tb [145], SiO 2 [146], TiO 2 [147], V 2 O 5 [148], etc., have been reported before. Their positive effects on WO 3 EC films are summarized in Figure 10.…”

Section: Electrochromic Applications 41 Tungsten Oxides As Ec Electrode In Visible Light Areamentioning

confidence: 99%

“…Its large specific surface area was a result of the porosity obtained after the removal of template material so that electrolyte penetration can be bettered and the transmission of both electrons and ions are accelerated [146,147]. Owing to the periodicity and uniformity of the template, the final product also has a periodic and uniform structure, thus light reflection and refraction can be enhanced and it is beneficial for effective reduction of visible and NIR light transmittance [146,148,149].…”

Section: Inverse Opal-structured Tungsten Oxidesmentioning

confidence: 99%

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

Han

Shi

2021

Nanomaterials

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Tungsten oxide-based materials have drawn huge attention for their versatile uses to construct various energy storage devices. Particularly, their electrochromic devices and optically-changing devices are intensively studied in terms of energy-saving. Furthermore, based on close connections in the forms of device structure and working mechanisms between these two main applications, bifunctional devices of tungsten oxide-based materials with energy storage and optical change came into our view, and when solar cells are integrated, multifunctional devices are accessible. In this article, we have reviewed the latest developments of tungsten oxide-based nanostructured materials in various kinds of applications, and our focus falls on their energy-related uses, especially supercapacitors, lithium ion batteries, electrochromic devices, and their bifunctional and multifunctional devices. Additionally, other applications such as photochromic devices, sensors, and photocatalysts of tungsten oxide-based materials have also been mentioned. We hope this article can shed light on the related applications of tungsten oxide-based materials and inspire new possibilities for further uses.

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Influence of Dopant Concentration on the Electrochromic Properties of Tungsten Oxide Thin Films

Cited by 66 publications

References 72 publications

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

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Influence of Dopant Concentration on the Electrochromic Properties of Tungsten Oxide Thin Films

Cited by 66 publications

References 72 publications

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx (MXene) Addition for Enhanced Electrochromic Performance

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO3 Electrochromic Devices

Advances in Electrochemical Energy Devices Constructed with Tungsten Oxide-Based Nanomaterials

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Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices