Fabrication of metal-supramolecular polymers of FeL/carbon nanomaterials with enhanced electrochromic properties

Qu, Dawei; Liu, Liwei; Li, Xin; Chen, Kun; Zheng, Yuanyuan; Xue, Yumiao; Chen, Guangming

doi:10.1016/j.compscitech.2020.108252

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…Although different strategies have recently been published to increase the coloring efficiency and duration [ 21 , 22 ], inorganic electrochromic materials still have the challenges of slow switching time and monotonous color. Organic electrochromic materials [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] have also attracted great interest due to their excellent properties, such as easy structure modification, rich redox states, wide voltage window, and high energy density.…”

Section: Introductionmentioning

confidence: 99%

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Zhang

Guan

et al. 2021

Materials

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As a promising electrochromic material, viologens have attracted increasing attention due to their high redox activity and adjustable electrochromic capability. In order to investigate the effect of alkyl substituents on electrochromic behavior, four alkyl-substituted viologens and a benzyl-substituted viologen were synthesized, namely 1,1′-dioctyl-4,4′-bipyridinium dibromide (OV), 1,1′-didekyl-4,4′-bipyridinium dibromide (DeV), 1,1′-didodecyl-4,4′-bipyridinium dibromide (DoV), 1,1′-dihexadecyl-4,4′-bipyridinium dibromide (HV), and 1,1′-dibenzyl-4,4′-bipyridinium dibromide (BV). The different photophysical and electrochemical properties of these viologens were attributed to their deviation in spatial structure caused by different substituents. Compared with benzyl-substituted BV, a slight blueshift occurred for the absorption peaks of alkyl-substituted viologens from 262 to 257 nm with the increase in alkyl chain length. Moreover, the first redox couple increased positively, and the dimerization of the compound decreased gradually, accompanied by the decrease in optical contrast and distinct chromatic difference. A comparison of chromatic and optical contrasts indicated that OV had the longest coloring response time (RTc), while it was shortest for HV. The bleaching response time (RTb) of viologen films gradually decreased with the alkyl chain length, and the OV film had the shortest RTb. Furthermore, when increasing the length of the alkyl chain, the cycling stabilities of alkyl viologens increased gradually. In addition, the OV film exhibited the best contrast after 200 continuous cycles.

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Section: Introductionmentioning

confidence: 99%

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Zhang

Guan

et al. 2021

Materials

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“…Moreover, Qu et al. studied the EC properties of different carbonaceous materials, e. g., SWCNT, graphene oxide, and buckminsterfullerene (C 60 ) in combination with Fe‐MEPE [35] . Here, the poor dispersibility of the carbon nanomaterials was improved by surface modification with an acid solution (HNO 3 /H 2 SO 4 , 3 : 1 (v/v)).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, Qu et al studied the EC properties of different carbonaceous materials, e. g., SWCNT, graphene oxide, and buckminsterfullerene (C 60 ) in combination with Fe-MEPE. [35] Here, the poor dispersibility of the carbon nanomaterials was improved by surface modification with an acid solution (HNO 3 /H 2 SO 4 , 3 : 1 (v/v)). The results after the addition of 4 wt.% of the functionalized nanomaterials indicate that the stability of pristine Fe-MEPE can be availably improved due to the extended conjugated system and the donor-acceptor (D-A) effect, thus resulting in an enhancement of the electrochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells

2023

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Metallopolymers (MEPEs) show a strong absorption band attributed to a metal-to-ligand charge transfer (MLCT) transition. Fe-MEPE and Ru-MEPE thin films switch reversibly from blue-purple (λ max = 584 nm, Fe 2 + ) to colorless (Fe 3 + ) or orange (λ max = 518 nm, Ru 2 + ) to pale green (Ru 3 + ). The addition of multi-walled carbon nanotubes (MWCNTs) enhances the electrochromic (EC) properties of Fe-and Ru-MEPE electrodes in several ways: (1) faster response for bleaching/coloring; (2) enhanced Coulombic efficiency; and (3) improved cycling stability, particularly for Ru-MEPE. Moreover, the charge density of the thin film electrodes can be increased upon the addition of the MWCNTs. This performance improvement is demonstrated in electrochromic devices (ECDs) with titanium-doped vanadium oxide (TiVO x ) as the optically-passive ion storage layer. The visible light transmittance τ v values of the ECDs are improved by the addition of the MWCNTs from 20 %/56 % to 17 %/56 % and from 31 %/47 % and 34 %/55 % in the dark/bright state, for Fe-MEPE and Ru-MEPE, respectively. Thus, the addition of MWCNTs to Fe-or Ru-MEPE is a very promising route for future fast-switching EC applications, e. g., displays, sunroofs, and rear-view mirrors.

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“…Electrochromic materials (ECMs) have drawn widespread attention due to enormous application prospects, such as smart windows, automotive anti-glare rearview mirrors, displays, military camouflage, electronic paper, infrared heat radiation modulation devices, and information storage. − A series of ECMs have witnessed explosive developments in recent years. Among them, Prussian blue (PB) has been considered a promising ECM due to its high redox reversibility, low threshold voltage, and long-term durability, originating from its infinite three-dimensional network. − In most cases, PB works as an anodic ECM, which permits sodium, potassium, and other ions in the solution to migrate in the channel and lattice defects of PB network, compensating the charge generated by the redox reaction occurring in the iron-active center of PB. , Therefore, PB presents different colors at different voltages, such as Prussian blue, Prussian white, and Berlin green according to different oxidation states.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a PB@SiO₂ Photonic Crystal Composite with Enhanced Electrochromic Performance

Zhang

Qin

et al. 2021

ACS Appl. Electron. Mater.

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SiO2 photonic crystals are employed as a template to prepare composite films of Prussian blue (PB) on a SiO2 photonic crystal (PB@SiO2) by a facile method. The surface morphology and crystallinity are characterized, and the optical, electrochemical, and electrochromic properties are measured. Compared with the pure PB film, the redox ability of the PB@SiO2 composite film increases. In addition, the composite displays a maximum contrast as high as 49.1%, accelerated coloration, and bleaching response times of 3.4 and 6.1 s relative to those of the pure PB. Moreover, the cyclic stability of the PB@SiO2 composite film is also enhanced. Results show that the electrochromic function can be significantly improved by judicious construction of the core–shell structure of PB@SiO2, which may open an avenue to fabricate high-performance electrochromic composites and facilitate their applications.

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Fabrication of metal-supramolecular polymers of FeL/carbon nanomaterials with enhanced electrochromic properties

Cited by 5 publications

References 31 publications

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells

Preparation of a PB@SiO₂ Photonic Crystal Composite with Enhanced Electrochromic Performance

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Fabrication of metal-supramolecular polymers of FeL/carbon nanomaterials with enhanced electrochromic properties

Cited by 5 publications

References 31 publications

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Substituent-Adjusted Electrochromic Behavior of Symmetric Viologens

Addition of Multi‐walled Carbon Nanotubes to Fe‐ and Ru‐Metallopolymer Electrodes Enhances Response Time and Cycling Stability in Electrochromic Cells

Preparation of a PB@SiO2 Photonic Crystal Composite with Enhanced Electrochromic Performance

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Preparation of a PB@SiO₂ Photonic Crystal Composite with Enhanced Electrochromic Performance