Photoelectrochromic devices with cobalt redox electrolytes

Dokouzis, Alexandros; Bella, Federico; Theodosiou, Krystallia; Gerbaldi, Claudio; Leftheriotis, G.

doi:10.1016/j.mtener.2019.100365

Cited by 53 publications

(30 citation statements)

References 25 publications

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“…[ 45,46 ] Using a tetramethylthiourea/tetramethylformaminium disulfide (TMTU/TMFDS 2+ )‐based electrolyte, a color contrast of 57% was obtained. [ 27 ] For the viologen‐TiO 2 based ECD using an I − /I 3 − based electrolyte, a reflectance change of 19% was obtained. [ 28 ] On the contrary, the color contrast of the viologen‐TiO 2 based ECD was 55% in the electrolyte containing only LiClO 4 .…”

Section: Resultsmentioning

confidence: 99%

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Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

Wang

et al. 2020

Adv Materials Technologies

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POMs) recently emerged as promising inorganic materials due to their varying structures, high electrochemical activities, and EC performances. [11,12] The most common and widely investigated POM structure is the Keggin structure, which is applied in biochemical, electrochemical, and catalytic areas. [13] However, studies on the EC properties of Keggin-structured POMs are limited, and their reported EC performances were inferior to other POM types. [14] Several attempts were made to improve the EC performance, including modifying the molecular structure or atomic composition, and optimizing the nanostructures [15-19] Notably, for POM-based EC materials, these approaches were employed by simultaneously selecting and controlling their nanostructures. Porous TiO 2 nanoparticle films (TNFs) are successful POMs' hosts displaying satisfactory EC performances due to their large specific surface area and porous morphology. [20-23] Further increases in ΔT were obtained by assisting the EC reaction by charge-balancing species between the working and counter electrodes in a full cell structure. Although some full cell type ECDs were achieved with POMs, [20,23] charge-balancing reactions were rarely examined, possibly because of the complicated EC mechanism, which makes it difficult to select CBMs for POMs. To create a CBM, a redox active material or electron reservoir was coated on the counter electrode (film type) or dissolved in the electrolyte (solution type). To simplify the ECD structure and avoid increasing its thickness, the solution type could be promising for high-performance ECDs. For example, a WO 3-based ECD showed enhanced EC performance when it was assembled with an electrolyte containing a tetramethylthiourea redox couple. [24,25] Similarly, viologen-based ECDs displayed fast switching times and high cycling stability in the presence of an I − /I 3 − redox mediator in a gelatin-electrolyte. [26,27] However, POM-based ECDs with redox couples in the electrolyte are not reported in literature. Noticeably, POM-based ECDs suffer from limited electrolyte choices and low optical contrast (ΔT), and POM-based EC films are mainly operated in aqueous media. [28] Also, the limited electrochemical window (1.23 V) of the aqueous electrolyte restricted their broader application in ECDs. [29] In general, water can be electrolyzed, but generates bubbles at the voltage range for coloration and bleaching of EC materials. In a A nonaqueous charge-balancing electrolyte with a redox couple (I − /I 3 −) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW 12 O 40 3− (PW 12)-coated porous TiO 2 nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW 12-ECDs reached 59.4% with the electrolyte containing the I − /I 3 − redox couple. PW 12-ECDs also show a fast response time for bleaching (t b,90% = 1.9 s) and coloration (t c,90% = 3.1 s). On the contrary, without the I − /I 3 − redox ...

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Section: Resultsmentioning

confidence: 99%

“…[ 24,25 ] Similarly, viologen‐based ECDs displayed fast switching times and high cycling stability in the presence of an I − /I 3 − redox mediator in a gelatin‐electrolyte. [ 26,27 ] However, POM‐based ECDs with redox couples in the electrolyte are not reported in literature.…”

Section: Introductionmentioning

confidence: 99%

Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

Wang

et al. 2020

Adv Materials Technologies

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“…They found that devices embodying the PhmEDOT thin film reported faster kinetics and higher contrast (∆T = 21%) as compared to the one embodying a PEDOT thin film (∆T = 13%). Dokouzis et al reported further works on PECDs, recently, using cobalt redox electrolytes [100] and studying the long term performance, exposing them to insolation in short-circuit and open-circuit conditions [97]. Theodosiou et al fabricated electrolytes with different concentrations of PMMA, having a ionic conductivity in the order of 10 −5 S/cm, which decreased if the PMMA increased [98].…”

Section: A Chronological Review Of Pecdsmentioning

confidence: 99%

The Challenge for Building Integration of Highly Transparent Photovoltaics and Photoelectrochromic Devices

et al. 2020

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This paper holds a critical review of current research activities dealing with smart architectural glazing worldwide. Hereafter, the main trends are analyzed and critically reported, with open issues, challenges, and opportunities, providing an accurate description of technological evolution of devices in time. This manuscript deals with some well-known, highly performing technologies, such as semitransparent photovoltaics and novel photoelectrochromic devices, the readiest, probably, to reach the final stage of development, to disclose the manifold advantages of multifunctional, smart glazing. The complex, overall effects of their building integration are also reported, especially regarding energy balance and indoor visual comfort in buildings.

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“…In recent years, beyond the strategies aiming at improving device performance and new optimization processes for materials on the nanoscale, there has been a clear trend to design devices with extended functionalities, coupling several functions; in the case of photoelectrochromic devices [93,94] and photovoltachromic ones [23], this would allow the separation of the control of optical modulation from photovoltaic conversion. A further approach, aiming at a separation of visible and near-infrared modulation, has been adopted in the design of so-called dual-band devices, produced by the research group of the LBNL [33,34].…”

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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Photoelectrochromic devices with cobalt redox electrolytes

Cited by 53 publications

References 25 publications

Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

The Challenge for Building Integration of Highly Transparent Photovoltaics and Photoelectrochromic Devices

Chromogenic Technologies for Energy Saving

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