Crystalline WO3 nanowires array sheathed with sputtered amorphous shells for enhanced electrochromic performance

Tang, Kaixuan; Zhang, Yong; Shi, Yingdi; Cui, Jiewu; Shu, Xiaoyan; Wang, Yan; Liu, Jiaqin; Tan, Hark Hoe

doi:10.1016/j.apsusc.2019.143796

Cited by 53 publications

(26 citation statements)

References 53 publications

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“…Furthermore, more active units could effectively participate in the redox reactions and more ions can be stored in the EC layer during the EC process. [ 29,30 ]…”

Section: Resultsmentioning

confidence: 99%

Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

et al. 2021

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WO3 and NiOx films with various thicknesses are deposited by reactive direct current magnetron sputtering. The relationship between film thickness and its electrochromic properties is investigated. A typical five‐layer corresponding complementary electrochromic device (CECD) is fabricated using optimized individual thicknesses of WO3 and NiOx, with UV‐curing Li+‐based polymer gel electrolyte. The results show that increasing film thickness can generally enhance the electrochemical and optical properties of WO3 and NiOx films. However, charge capacities and optical modulation drop when the thickness reaches a critical value, due to the dominance of the diffusion‐controlled process. 350 nm WO3 displays a wide optical modulation of 82.21% with a charge density of 36.72 mC cm−2, whereas 360 nm NiOx exhibits an optical modulation of 46.37% with a charge density of 7.66 mC cm−2. The CECD presents a fast response (bleaching and coloring time of 2.4 and 4 s, respectively) and good durability with optical modulation decreasing only 16% after 300 cycles. The current densities exhibit no significant decline till 3000 cycles during the stable period. The involvement of the diffusion‐controlled process in the electrochemical mechanism is substantiated by fitting chronoamperometry data, and the diffusion coefficient in the activated period is about three times larger than that in the stable period.

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“…Furthermore, more active units could effectively participate in the redox reactions and more ions can be stored in the EC layer during the EC process. [ 29,30 ]…”

Section: Resultsmentioning

confidence: 99%

Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

et al. 2021

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“…In order to explore the electrochemical properties of the films, CV tests are carried out at a scan rate of 50 mV s –1 in a voltage range of −0.8 to 0.8 V. As depicted in Figure a, it can be observed that WO 3 -70 and WO 3 -CC exhibit larger areas of voltammograms than WO 3 -400, indicating that more active units in WO 3 -70 and WO 3 -CC could effectively participate in the oxidation–reduction reaction and more ions can be stored in the active material during the EC process . Moreover, in comparison to WO 3 -400, WO 3 -70 and WO 3 -CC display a faster current change rate and larger current density, revealing a faster ion-diffusion rate in these films.…”

Section: Resultsmentioning

confidence: 99%

Preparation of WO₃ Films with Controllable Crystallinity for Improved Near-Infrared Electrochromic Performances

Zhao

Zhang

Chen

et al. 2020

ACS Sustainable Chem. Eng.

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In this study, a WO 3 film with controllable crystallinity has been prepared by radio frequency magnetron sputtering. The WO 3 film with about 400 nm thickness and controllable crystallinity not only has the advantages of amorphous WO 3 with large transmittance modulation and short switching response time but also has the outstanding cyclic stability of crystalline WO 3 . Therefore, this WO 3 film exhibits superior electrochromic performances including large transmittance modulation in the near infrared regime (72.5% at λ = 1000 nm), short coloration/bleaching switching response time (5.3 s for coloration and 3.0 s for bleaching), high coloration efficiency at λ = 1000 nm (80.5 cm 2 C −1 ), and excellent cycle stability. The strategy of preparing a WO 3 film with controllable crystallinity by a simple magnetron sputtering method presents an innovative direction to obtain high-performance WO 3 electrochromic materials applied in the fields of smart windows, spacecraft thermal control, and infrared camouflage.

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“…The solar light passing through WO 3 can be regulated in amplitude and energy due to the adjustable bandgap by varying the crystalline structure and oxygen stoichiometry. [68][69][70][71][72][73] As shown in Figure 3a, when the oxygen vacancies in WO 3 NPs increased from WO 3 to WO 2.92 , WO 2.83 , WO 2.72, and WO 2 , transmittance in the VIS region decreased along with a blue-shift of the absorption peak. [74] This is in accordance with a later report [63] Copyright 2011, American Chemical Society.…”

Section: Wo 3 -Based Dual-band Materialsmentioning

confidence: 99%

Recent Advances on Dual‐Band Electrochromic Materials and Devices

Zhai

Shen

et al. 2022

Adv Funct Materials

119

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Dual-band electrochromism is a phenomenon where materials can independently regulate the transmittance of visible (VIS) and near-infrared (NIR) light. Owing to their bistability, low energy consumption, and independent control over VIS and NIR regions, dual-band electrochromic (EC) devices have been of great significance to fully harnessing VIS and NIR light and building an energy-saving society. The past several years have witnessed the efforts put in developing novel EC materials to improve their dual-band optical performance through altering their composition, structural, and physicochemical features, which determine the optical behavior of dual-band EC devices. In this review, the concept, significance, working principle, and key influence factors of dual-band electrochromism are briefly introduced. Next, the up-to-date progress of dual-band EC materials including inorganic, organic, and composites materials are summarized, with a focus on material design, device fabrication, and performance optimization. Finally, the challenges and perspectives of dual-band EC materials and devices are also presented.

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Crystalline WO3 nanowires array sheathed with sputtered amorphous shells for enhanced electrochromic performance

Cited by 53 publications

References 53 publications

Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Preparation of WO₃ Films with Controllable Crystallinity for Improved Near-Infrared Electrochromic Performances

Recent Advances on Dual‐Band Electrochromic Materials and Devices

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Crystalline WO3 nanowires array sheathed with sputtered amorphous shells for enhanced electrochromic performance

Cited by 53 publications

References 53 publications

Thickness Dependence of WO3 and NiOx Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Thickness Dependence of WO3 and NiOx Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Preparation of WO3 Films with Controllable Crystallinity for Improved Near-Infrared Electrochromic Performances

Recent Advances on Dual‐Band Electrochromic Materials and Devices

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Product

Resources

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Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Thickness Dependence of WO₃ and NiO_x Thin Films in All‐Solid‐State Complementary Electrochromic Devices

Preparation of WO₃ Films with Controllable Crystallinity for Improved Near-Infrared Electrochromic Performances