Electrochromics for energy efficient buildings: Towards long-term durability and materials rejuvenation

Wen, Rui‐Tao; Arvizu, Miguel A; Niklasson, Gunnar A.; Granqvist, Claes‐Göran

doi:10.1016/j.surfcoat.2015.06.047

Cited by 24 publications

(13 citation statements)

References 51 publications

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“…Summarizing, we have used ToF-ERDA to demonstrate (i) that Li + intercalation can take place rather evenly throughout the cross-section of an electrochromic WO 3 -based film, which is different from the case of electrochromic NiO-based films where the interaction with Li + is a surface phenomenon; (ii) that the degradation of WO 3 -based films under excessive voltammetric cycling is associated with Li + trapping; and (iii) that galvanostatic rejuvenation of WO 3 films is unambiguously related to Li + detrapping. The results of this study are almost certainly applicable to other cathodically coloring electrochromic oxides, and possibly to batteries and other types of ionic-based devices.…”

mentioning

confidence: 74%

Galvanostatic Ion Detrapping Rejuvenates Oxide Thin Films

Arvizu¹,

Wen²,

Primetzhofer³

et al. 2015

ACS Appl. Mater. Interfaces

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Ion trapping under charge insertion−extraction is wellknown to degrade the electrochemical performance of oxides. Galvanostatic treatment was recently shown capable to rejuvenate the oxide, but the detailed mechanism remained uncertain. Here we report on amorphous electrochromic (EC) WO 3 thin films prepared by sputtering and electrochemically cycled in a lithium-containing electrolyte under conditions leading to severe loss of charge exchange capacity and optical modulation span. Time-of-flight elastic recoil detection analysis (ToF-ERDA) documented pronounced Li + trapping associated with the degradation of the EC properties and, importantly, that Li + detrapping, caused by a weak constant current drawn through the film for some time, could recover the original EC performance. Thus, ToF-ERDA provided direct and unambiguous evidence for Li + detrapping.

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mentioning

confidence: 74%

Galvanostatic Ion Detrapping Rejuvenates Oxide Thin Films

Arvizu¹,

Wen²,

Primetzhofer³

et al. 2015

ACS Appl. Mater. Interfaces

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“…C.G. Granqvist reviewed the gradual evolution of TCs and ECs in the latest years, highlighting the recent steps towards the commercial spread of such technologies: TC nanoparticles and VO 2 doping are reported as promising approaches for improving TC features; on the other hand, it was observed that mixed oxides will probably be a suitable strategy for future research outcomes; moreover, Wen et al [88] showed that degraded EC films, based on both W oxide and Ti oxide, can be rejuvenated by means of a suitable galvanostatic treatment. This important result may improve the cyclability of EC devices, extending the durability of smart windows.…”

Section: Considerations About Building-integration Of Chromogenic Tecmentioning

confidence: 99%

Chromogenic Technologies for Energy Saving

Cannavale

2020

Clean Technol.

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Chromogenic materials and devices include a wide range of technologies that are capable of changing their spectral properties according to specific external stimuli. Several studies have shown that chromogenics can be conveniently used in building façades in order to reduce energy consumption, with other significant effects. First of all, chromogenics influence the annual energy balance of a building, achieving significant reductions in consumption for HVAC and artificial lighting. In addition, these technologies potentially improve the indoor level of visual comfort, reducing the risks of glare and excessive lighting. This brief review points to a systematic discussion—although not exhaustive and mainly limited to recent results and investigations—of the main studies that deal with building-integrated chromogenics that have appeared, so far, in the scientific literature.

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“…Spectral modulation of optical properties may result in an optimized tuning of the energy flux through glazing, with particular reference to the visible and infrared ranges of the impinging solar radiation. An accurate design and building integration of chromogenics may eventually reduce cooling/heating loads and enhance indoor visual comfort as well [153][154][155][156]. Over the last few decades, a strong impulse towards experimental research dealing with TiO 2 has come via nanoscience.…”

Section: Tio 2 In the Design Of Chromogenic Devices-general Considerationsmentioning

confidence: 99%

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

2020

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The use of titanium dioxide (TiO2) within two specific classes of devices, namely electrochromic and photoelectrochromic, is described hereafter, with respect to its inherent properties and chromogenic features within architectures that have appeared so far, in this field. The new research trends, involving the applications of TiO2 in chromogenic materials are reported, with particular attention paid to the techniques used for film deposition as well as the synthesis of nanoparticles. Furthermore, the main studies concerning its chemical-physical properties and approaches to its chemical syntheses and fabrication are reviewed, with special regard to “green” routes. In addition, the main aspects relating to toxicological profiles are exposed, with reference to nanoparticles and thin films.

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Electrochromics for energy efficient buildings: Towards long-term durability and materials rejuvenation

Cited by 24 publications

References 51 publications

Galvanostatic Ion Detrapping Rejuvenates Oxide Thin Films

Galvanostatic Ion Detrapping Rejuvenates Oxide Thin Films

Chromogenic Technologies for Energy Saving

Titanium Dioxide in Chromogenic Devices: Synthesis, Toxicological Issues, and Fabrication Methods

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