scholarly journals Smart Facades: A Large-Area Smart Window with Tunable Shading and Solar-Thermal Harvesting Ability Based on Remote Switching of a Magneto-Active Liquid (Adv. Sustainable Syst. 1/2018)

2018 ◽  
Vol 2 (1) ◽  
pp. 1870001 ◽  
Author(s):  
Benjamin P. V. Heiz ◽  
Zhiwen Pan ◽  
Lingqi Su ◽  
Si Thien Le ◽  
Lothar Wondraczek
Keyword(s):  
Solar Thermal ◽  
Smart Window ◽  
Large Area ◽  
Active Liquid

scholarly journals A Large-Area Smart Window with Tunable Shading and Solar-Thermal Harvesting Ability Based on Remote Switching of a Magneto-Active Liquid

2017 ◽  
Vol 2 (1) ◽  
pp. 1700140 ◽  
Author(s):  
Benjamin P. V. Heiz ◽  
Zhiwen Pan ◽  
Lingqi Su ◽  
Si Thien Le ◽  
Lothar Wondraczek
Keyword(s):  
Solar Thermal ◽  
Smart Window ◽  
Large Area ◽  
Active Liquid

Diameter dependent transparency changes of nanorod-based large-area flexible smart window devices

2018 ◽  
Vol 6 (47) ◽  
pp. 24157-24165
Author(s):  
Fuqiang Ren ◽  
Shengyun Huang ◽  
Fan Yang ◽  
Aycan Yurtsever ◽  
Dongling Ma
Keyword(s):  
Structural Damage ◽  
Optical Modulation ◽  
Smart Window ◽  
Large Area

Flexible SPDs achieve optical modulation as high as 73.7% and bending capability up to ∼180 degrees without any structural damage.

Solution-processable electrochromic materials and devices: roadblocks and strategies towards large-scale applications

2019 ◽  
Vol 7 (41) ◽  
pp. 12761-12789 ◽  
Author(s):  
Xuefei Li ◽  
Kuluni Perera ◽  
Jiazhi He ◽  
Aristide Gumyusenge ◽  
Jianguo Mei
Keyword(s):  
Large Scale ◽  
Smart Window ◽  
Large Area ◽  
Electrochromic Materials ◽  
Figures Of Merit ◽  
Solution Processable ◽  
Window Applications ◽  
Challenges And Strategies

This review describes figures of merit, challenges and strategies during the development of solution-processable electrochromic materials and devices for large-area smart window applications.

Fabrication of solar and electrically adjustable large area smart windows for indoor light and heat modulation

2017 ◽  
Vol 5 (24) ◽  
pp. 5917-5922 ◽  
Author(s):  
Ashutosh K. Singh ◽  
S. Kiruthika ◽  
Indrajit Mondal ◽  
Giridhar U. Kulkarni
Keyword(s):  
Smart Window ◽  
Large Area ◽  
Smart Windows ◽  
Active Layers ◽  
Window Applications

Invisible Cu mesh electrodes used as ITO alternative serve as transparent heaters for large area smart window applications with commercial thermochromic pigments and gels as active layers.

scholarly journals All-Solid-State Proton-Based Tandem Structure Achieving Ultrafast Switching Electrochromic Windows

2021 ◽  
Author(s):  
Zewei Shao ◽  
Aibin huang ◽  
Chen Ming ◽  
John Bell ◽  
Pu Yu ◽  
...  
Keyword(s):  
Solid State ◽  
Fast Response ◽  
Optical Modulation ◽  
Smart Window ◽  
Large Area ◽  
Solid Polymeric Electrolyte ◽  
Tandem Structure ◽  
Diffusion Speed ◽  
Ultrafast Switching ◽  
Window Applications

Abstract All-solid-state electrochromic devices (ECDs) for smart-window applications currently suffer from limited ion diffusion speed, which lead to slow coloration and bleaching processes. Here, we design an all-solid-state tandem structure with protons as diffusing species achieving an ultrafast switching ECD. We use WO3 as the electrochromic material, while poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) as the solid-state proton source to enable fast switching. This structure by itself exhibits low optical modulation (i.e., difference of on/off transmittance). We further introduce a solid polymeric electrolyte layer on top of PEDOT:PSS to form a tandem structure, which provides Na+ ions to PEDOT:PSS and pump protons there to the WO3 layer through ion exchange. Our new all-solid-state ECD features high optical modulation (>92% at 650 nm), fast response (coloration to 90% in 0.7 s and bleaching to 65% in 0.9 s and 90% in 7.1 s) and excellent stability (<10% degradation after 3000 cycles). Large-area (30×40 cm2) as well as flexible devices are fabricated to demonstrate the great potential for scaling up.

scholarly journals Mixed Nanostructured Ti-W Oxides Films for Efficient Electrochromic Windows

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Nguyen Nang Dinh ◽  
Dang Hai Ninh ◽  
Tran Thi Thao ◽  
Truong Vo-Van
Keyword(s):  
Electrochemical Deposition ◽  
Deposition Process ◽  
Electrochemical Stability ◽  
Electrochromic Devices ◽  
Smart Window ◽  
Large Area ◽  
Doctor Blade ◽  
Electrochemical Deposition Method ◽  
Window Applications

With the aim to enhance the electrochromic (EC) efficiency and electrochemical stability of electrochromic devices (ECD), mixed nanostructured TiO2/WO3films were prepared by an electrochemical deposition method with the purpose of adding WO3nanoparticles to porous nanocrystalline doctor-blade TiO2(nc-TiO2) films. The results of the characterization of electrochromic properties in 1 M LiClO4+ propylene carbonate (LiClO4+ PC) of both the nc-TiO2/F-doped tin oxide (FTO) and WO3/TiO2/FTO configurations showed the reversible coloration and bleaching of the ECDs. The response time of the ECD coloration of WO3/TiO2/FTO was found to be as small as 2 sec, and its coloration efficiency (CE) as high as 35.7 cm2× C−1. By inserting WO3nanoparticles into the porous TiO2structures, WO3/TiO2heterojunctions were formed in the films, consequently enabling both the CE and electrochemical stability of the working electrodes to be considerably enhanced. Since a large-area WO3/TiO2can be prepared by the doctor-blade technique followed by the electrochemical deposition process, mixed nanostructured Ti-W oxides electrodes constitute a good candidate for smart window applications, taking advantage of the excellent coloration and stability properties as well as the simple and economical fabrication process involved.

scholarly journals Influence of single-nanoparticle electrochromic dynamics on the durability and speed of smart windows

2019 ◽  
Vol 116 (26) ◽  
pp. 12666-12671 ◽  
Author(s):  
R. Colby Evans ◽  
Austin Ellingworth ◽  
Christina J. Cashen ◽  
Christopher R. Weinberger ◽  
Justin B. Sambur
Keyword(s):  
Surface Defects ◽  
Building Blocks ◽  
Particle Interactions ◽  
Smart Window ◽  
Large Area ◽  
Smart Windows ◽  
Single Nanoparticle ◽  
Oxide Nanorods ◽  
Li Ion ◽  
Ion Insertion

Nanomaterials have tremendous potential to increase electrochromic smart window efficiency, speed, and durability. However, nanoparticles vary in size, shape, and surface defects, and it is unknown how nanoparticle heterogeneity contributes to particle-dependent electrochromic properties. Here, we use single-nanoparticle-level electro-optical imaging to measure structure–function relationships in electrochromic tungsten oxide nanorods. Single nanorods exhibit a particle-dependent waiting time for tinting (from 100 ms to 10 s) due to Li-ion insertion at optically inactive surface sites. Longer nanorods tint darker than shorter nanorods and exhibit a Li-ion gradient that increases from the nanorod ends to the middle. The particle-dependent ion-insertion kinetics contribute to variable tinting rates and magnitudes across large-area smart windows. Next, we quantified how particle–particle interactions impact tinting dynamics and reversibility as the nanorod building blocks are assembled into a thin film. Interestingly, single particles tint 4 times faster and cycle 20 times more reversibly than thin films made of the same particles. These findings allow us to propose a nanostructured electrode architecture that optimizes optical modulation rates and reversibility across large-area smart windows.

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