Sub-second electrochromic switching and ultra-high coloration efficiency in halloysite nanoclay incorporated metallo-supramolecular polymer nano-hybrid based electrochromic device

2020 ◽  
Vol 208 ◽  
pp. 110392 ◽  
Author(s):  
Susmita Roy ◽  
Chanchal Chakraborty
Keyword(s):  
Electrochromic Device ◽  
Supramolecular Polymer ◽  
Coloration Efficiency

scholarly journals Dual-Cation Electrolytes Crosslinked with MXene for High-Performance Electrochromic Devices

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 874
Author(s):  
Soyoung Bae ◽  
Youngno Kim ◽  
Jeong Min Kim ◽  
Jung Hyun Kim
Keyword(s):  
Ionic Conductivity ◽  
Response Time ◽  
Indium Tin Oxide ◽  
High Performance ◽  
Fast Response ◽  
High Ionic Conductivity ◽  
Electrochromic Device ◽  
Fast Response Time ◽  
Coloration Efficiency ◽  
Conduction Pathway

MXene, a 2D material, is used as a filler to manufacture polymer electrolytes with high ionic conductivity because of its unique sheet shape, large specific surface area and high aspect ratio. Because MXene has numerous -OH groups on its surface, it can cause dehydration and condensation reactions with poly(4-styrenesulfonic acid) (PSSA) and consequently create pathways for the conduction of cations. The movement of Grotthuss-type hydrogen ions along the cation-conduction pathway is promoted and a high ionic conductivity can be obtained. In addition, when electrolytes composed of a conventional acid or metal salt alone is applied to an electrochromic device (ECD), it does not bring out fast response time, high coloration efficiency and transmittance contrast simultaneously. Therefore, dual-cation electrolytes are designed for high-performance ECDs. Bis(trifluoromethylsulfonyl)amine lithium salt (LiTFSI) was used as a source of lithium ions and PSSA crosslinked with MXene was used as a source of protons. Dual-Cation electrolytes crosslinked with MXene was applied to an indium tin oxide-free, all-solution-processable ECD. The effect of applying the electrolyte to the device was verified in terms of response time, coloration efficiency and transmittance contrast. The ECD with a size of 5 × 5 cm2 showed a high transmittance contrast of 66.7%, fast response time (8 s/15 s) and high coloration efficiency of 340.6 cm2/C.

Electrochromic Properties of Reactive Magnetron Sputtered WO3 Thin Films Prepared by Neon as Sputter Gas

2020 ◽  
Vol 20 (6) ◽  
pp. 3724-3733
Author(s):  
K. Uday Kumar ◽  
A. Subrahmanyam
Keyword(s):  
Thin Films ◽  
Maximum Efficiency ◽  
Electrochromic Device ◽  
Conducting Layer ◽  
Lithium Ions ◽  
Coloration Efficiency ◽  
Energy Applications ◽  
Sputtered Films ◽  
Ion Conducting ◽  
Wo3 Thin Films

Electrochromic phenomenon is an emerging technology for renewable energy applications. Several material oxides used for the electrochromic application, the tungsten oxide (WO3) has shown good coloration efficiency (CE). Present manuscript, we are reporting the results of the coloration efficiency of DC magnetron sputtered WO3 films for electrochromic applications (thicknesses 190 nm to 700 nm) with sputter gas neon at 300 K. Hydrogen and Lithium ions have been intercalated into WO3 lattice for coloration. The CE value is increasing with increase of thickness of WO3 thin films; CE for 700 nm thick films are: 87 cm2/C and 137 cm2/C for H+ and Li+ respectively. The coloration efficiency (CE) observed to be increasing with wavelength. The maximum efficiency of the hydrogen intercalated neon sputtered films achieved at 860 nm wavelength is about 129.9 cm2/C and for the lithium intercalatedWO3 films the maximum efficiency achieved at 780 nm with 238.5 cm2/C. These neon sputtered WO3 thin films show good stability of coloration efficiency even after 500 cycles of coloring and bleaching cycles. The work function of the colored and transparent states of WO3 thin films are 4.513 eV and 4.755 eV respectively. Finally we have fabricated the electrochromic device (ECD) prepared with nafion thin film as an ion conducting layer and the ECD has shown a maximum coloration efficiency (CE) of 112.1 cm2/C.

Effect of TiO2 Particle Size on the Performance of Viologen-Anchored TiO2 Electrochromic Device

2007 ◽  
Vol 7 (11) ◽  
pp. 4106-4110 ◽  
Author(s):  
Yong Joo Kim ◽  
Hyun Ki Jeong ◽  
Jung Kyu Seo ◽  
Seung Yong Chai ◽  
Young Seok Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Contrast Ratio ◽  
Tio2 Particle ◽  
The Other ◽  
Optical Transparency ◽  
Electrochromic Device ◽  
Coloration Efficiency ◽  
Other Hand ◽  
Counter Ions ◽  
Anchored Tio2

The effect of TiO2 particle size on the performance of the electrochromic device (ECD) has been investigated in this work by applying the TiO2 nanoparticles in 7, 15, and 30 nm sizes. The phosphonated viologen, bis(2-phosphonoethyl)-4,4′-bipyridinium dibromide, was anchored on the TiO2 surfaces for the construction of ECD. The ECD derived from 7 nm-sized TiO2 demonstrated the highest contrast ratio with high optical transparency, whereas it showed the slowest switching response. The enhancement of coloration efficiency with decrease of TiO2 particle size is due to the increased amount of the anchored viologen on TiO2 electrode. On the other hand, the relatively slower switching response would be caused by the difficulty of diffusion for the electrolytes and counter-ions through the small pores of the nanocrystalline TiO2 electrode derived from 7 nm-sized nanoparticles.

A panchromatic electrochromic device composed of Ru(ii)/Fe(ii)-based heterometallo-supramolecular polymer

2019 ◽  
Vol 7 (25) ◽  
pp. 7554-7562 ◽  
Author(s):  
Li-Yin Hsiao ◽  
Ting-Hsiang Chang ◽  
Hsin-Che Lu ◽  
Yen-Chun Wang ◽  
Yen-An Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Prussian Blue ◽  
Memory Effect ◽  
Electrochromic Device ◽  
Supramolecular Polymer ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A panchromatic electrochromic device composed of PolyRuFe and Prussian blue is proposed in this study and the memory effect of PolyRuFe is improved by the incorporation of multi-walled carbon nanotubes.

scholarly journals An All-Solid-State Electrochromic Device Based on WO3–Nb2O5 Composite Films Prepared by Fast-Alternating Bipolar-Pulsed Reactive Magnetron Sputtering

Coatings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 9 ◽  
Author(s):  
Chien-Jen Tang ◽  
Ju-Liang He ◽  
Cheng-Chung Jaing ◽  
Chen-Jui Liang ◽  
Ching-Hung Chou ◽  
...  
Keyword(s):  
Solid State ◽  
Magnetron Sputtering ◽  
Response Times ◽  
Composite Films ◽  
Optical Modulation ◽  
Electrochromic Device ◽  
Coloration Efficiency ◽  
Sputtering Power ◽  
Bleaching Response ◽  
Negative Effect

In this study, WO3–Nb2O5 electrochromic films and an ITO/WO3–Nb2O5/Nb2O5/NiVOx/ITO all-solid-state electrochromic device were deposited using fast-alternating bipolar-pulsed magnetron sputtering using tungsten and niobium targets. The influence of different sputtering powers from the niobium target on the refractive index, extinction coefficient, optical modulation, coloration efficiency, reversibility, and durability of the WO3–Nb2O5 films is discussed. The aim of this work is to find the suitable Nb proportion to increase durability and less negative effect in the electrochromic performance of Nb2O5-doped WO3 films. The lifetime of the WO3–Nb2O5 films is 4 times longer than pure WO3 films when the sputtering power of the Nb target is higher than 250 W. The results show that WO3–Nb2O5 composite films used for an all-solid-state electrochromic device can sustain over 3 × 104 repeated coloring and bleaching cycles while the transmission modulations can be kept above 20%. The coloring and bleaching response times are 7.0 and 0.7 s, respectively.

Sub-phthalocyanine-incorporated Fe(ii) metallo-supramolecular polymer exhibiting blue-to-transmissive electrochromic transition with high transmittance and coloration efficiency

2018 ◽  
Vol 47 (45) ◽  
pp. 16036-16039 ◽  
Author(s):  
Arockiam Jesin Beneto ◽  
Jae Yoon Jeong ◽  
Jong S. Park
Keyword(s):  
Supramolecular Polymer ◽  
Coloration Efficiency

The preparation of a new Fe(ii) metallo-supramolecular polymer (poly-subPc-Fe) constructed from a terpyridine-functionalized sub-phthalocyanine with axially substituted polyisobutylene is presented.

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