Influence of applied voltage on optimal performance and durability of tungsten and vanadium oxide co-sputtered thin films for electrochromic applications

Mehmood, Ahmar; Haidry, Azhar Ali; Long, Xueyuan; Zhang, Xiaogang

doi:10.1016/j.apsusc.2020.147873

Cited by 16 publications

(7 citation statements)

References 42 publications

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“…As another important figure-of-merit for EC materials, the switching time was defined as the time required for 90% of the total optical change. As shown in Figure c, the V 2 O 5 @C microrods electrode exhibited fast colored/bleached times of 1.1/1.0 s, which were faster than most in the literature (Table S2 in the Supporting Information). ,,,− In contrast, EC electrodes with V 2 O 5 @C and commercial V 2 O 5 particles showed a much slower switching time of 3.1/1.7 s and 10.2/17.8 s (Figure S15 in the Supporting Information), respectively. This is because of the synergistic effect of (i) fast electron transport induced by uniformly coated carbon layer of V 2 O 5 @C and (ii) fast ionic diffusion in the hierarchical porous structure of V 2 O 5 @C microrods network …”

Section: Resultsmentioning

confidence: 77%

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network

Liang

et al. 2022

ACS Appl. Mater. Interfaces

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Vanadium pentoxide (V 2 O 5 ) with multicolor transition is widely studied in the electrochromic (EC) field to enrich color species of transition-metal oxides; yet, it always suffers from slow switching speed caused by poor electron conductivity and slow ion diffusion, poor cycling stability induced by large volume change during the EC reaction process. Herein, hierarchical network assembly of V 2 O 5 @C microrods is introduced to develop an ultrafast, stable, multicolor EC film. Using a two-step pyrolysis that involves metal−organic framework templates, porous microrods with a well-preserved one-dimensional structure are prepared through the assembly of V 2 O 5 @C nanocrystals at nanoscale, providing more active sites for ionic insertion and accessible pathways for electron transport. After spray-coating the V 2 O 5 @C microrods on conductive substrates, interconnected networks composed of V 2 O 5 @C microrods at microscale ensures the infiltration of electrolyte and provide ion transport channels. In addition, the nanoscale porous structure and coated carbon layer can accommodate volumetric changes during ion insertion/extraction process, ensuring high electrochemical stability. As a result, EC electrode with V 2 O 5 @C microrods network performed rapid switching speed (1.1/1.0 s) and stable cycle ability (96% after 2000 cycles). At last, flexible large-scale devices and multicolor digital displays were assembled to demonstrate potential application in next-generation wearable electronics.

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Section: Resultsmentioning

confidence: 77%

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network

Liang

et al. 2022

ACS Appl. Mater. Interfaces

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“…The reason was that of the difficulty of ion penetration and higher internal resistance 30 . CE refers to the ratio factor between the optical density (ΔOD) at a certain wavelength and the injected/exhausted electrochemical charge density ( Q d ) 31 demanded in the electrochromic light absorption change to induce a complete switching. CE is an important property of electrochromic materials.…”

Section: Resultsmentioning

confidence: 99%

Preparation and electrochromic properties of polyamides based on 3,4‐dimethylthieno[2,3‐b]thiophene

Hou

Zhang

et al. 2022

J of Applied Polymer Sci

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Based on the performance of improving the stabilities and coloring efficiencies of triphenylamine polymers, this paper separately synthesized different diamines and 3,4-dimethylthieno[2,3-b]thiophene-2,5-dicarboxylic acid, and the electrochromic functions of the polymer films were studied on indium-tin oxide glass (ITO) glass. The polymers had a thiophene group, which was rich in π-electrons and conducive to molecular stability, and showed good stabilities. Ultraviolet spectrum showed that all the six polymers had a wide absorption band in the neutral range of 200-700 nm. Electrochromic analysis showed that the six kinds of polymer films all showed reasonable optical contrast, short response time and low band gap in the infrared spectrum range of 200-1000 nm. Among them, the film formed by PAD2 on ITO glass had better electrochromic properties, longer bleaching response time (t c = 1.3 s, t b = 4.1 s), PAD3 had better coloration efficiency (214 cm 2 C À1 ).

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“…[86] Apart from the long-term stability, durability is another important metric to determine whether a PESW can be used in different seasons. [87,88] A qualified PESW should maintain good EC performance for years. More importantly, the PESW should also maintain stable EC performance in a severely cold environment below 30 C or a in an environment as hot as 60 C.…”

Section: Cementioning

confidence: 99%

Advances in Energy‐Efficient Plasmonic Electrochromic Smart Windows Based on Metal Oxide Nanocrystals

Wang

Meng

Wang

et al. 2021

Adv Energy and Sustain Res

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Energy consumption of buildings during heating and cooling accounts for about 15% of global total energy consumption. Advanced dynamic switchable windows that enable independent control of solar heat will contribute to optimal energy efficiency in heating, cooling, and artificial lighting systems throughout buildings. Recently, energy‐efficient plasmonic electrochromic smart windows (PESWs) based on metal oxide nanocrystals (NCs) have been gaining increasing attention due to their effective and controllable regulation over the near‐infrared region of the solar spectrum without affecting the dynamic visible transmittance of the smart windows. Herein, the current state‐of‐the‐art results of colloidal metal oxide NCs for PESWs are highlighted, along with their design strategies and working principles. The recent research status of PESWs in typical colloidal metal oxide NCs is reviewed in detail, and the challenges and corresponding countermeasures in this field are discussed. Furthermore, an outlook into novel opportunities in PESW‐related academic research and how to accelerate the pace of real‐world applications is presented.

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Influence of applied voltage on optimal performance and durability of tungsten and vanadium oxide co-sputtered thin films for electrochromic applications

Cited by 16 publications

References 42 publications

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network

Preparation and electrochromic properties of polyamides based on 3,4‐dimethylthieno[2,3‐b]thiophene

Advances in Energy‐Efficient Plasmonic Electrochromic Smart Windows Based on Metal Oxide Nanocrystals

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Influence of applied voltage on optimal performance and durability of tungsten and vanadium oxide co-sputtered thin films for electrochromic applications

Cited by 16 publications

References 42 publications

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V2O5@C Microrod Network

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V2O5@C Microrod Network

Preparation and electrochromic properties of polyamides based on 3,4‐dimethylthieno[2,3‐b]thiophene

Advances in Energy‐Efficient Plasmonic Electrochromic Smart Windows Based on Metal Oxide Nanocrystals

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Product

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Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network

Ultrafast, Stable Electrochromics Enabled by Hierarchical Assembly of V₂O₅@C Microrod Network