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212. Macromol. Rapid Commun. 20/2010

Author

Yee, Wu Aik, primary, Xiong, Shanxin, additional, Ding, Guoqiang, additional, Nguyen, Chien Anh, additional, Lee, Pooi See, additional, Ma, Jan, additional, Kotaki, Masaya, additional, Liu, Ye, additional, and Lu, Xuehong, additional

Published
2010
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244. Red-to-black electrochromism of 4,9-dihydro- s-indaceno[1,2-b:5,6-b']dithiophene-embedded conjugated polymers.

Author

Cho, Ching, Ye, Qun, Neo, Wei, Lin, Tingting, Song, Jing, Lu, Xuehong, and Xu, Jianwei

Subjects
ELECTROCHROMIC effect, THIOPHENES, CONJUGATED polymers, ORGANIC synthesis, ELECTROCHEMICAL analysis
Abstract

A series of 4,9-dihydro- s-indaceno[1,2-b:5,6-b′]dithiophene-based conjugated polymers with 3,4-bis(dodecyloxy)thiophene, 3,3-bis((dodecyloxy)methyl)-3,4-dihydro-2 H-thieno[3,4- b] [, ] dioxepine and 3,4-ethylenedioxythiophene as co-monomers were synthesized via Stille coupling reaction in more than 50 % yields. These polymers possess relatively high number-average molecular weights of 14,900-21,000 g mol and exhibit good solubility in common organic solvents. The physical and electrochemical properties of these polymers were studied, and the polymers showed optical bandgap between 2.04 and 2.08 eV. Electrochromic devices showed a rare and reversible colour change between dark red at neutral state and black at oxidized state with optical switching contrast ratios of up to 50 % at λ and 90 % at 1500 nm in the visible and NIR regions, respectively. Graphical abstract: 4,9-dihydro- s-indaceno[1,2-b:5,6-b']dithiophene-based conjugated polymers showing rare and reversible colour change between dark red at neutral state and black at oxidized state were synthesized via Stille coupling. These polymers possess high optical contrast in both the visible and NIR regions.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2015
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245. Poly(vinylidene fluoride) nanofibrous mats with covalently attached SiO2 nanoparticles as an ionic liquid host: enhanced ion transport for electrochromic devices and lithium-ion batteries.

Author

Zhou, Rui, Liu, Wanshuang, Yao, Xiayin, Leong, Yew Wei, and Lu, Xuehong

Abstract

In this article, it is demonstrated that the electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF–HFP)) nanofibrous mat functionalized with (3-aminopropyl)triethoxysilane is a versatile platform for the fabrication of hybrid nanofibrous mats by covalently attaching various types of inorganic oxide nanoparticles on the nanofiber surface via a sol–gel process. In particular, SiO2-on-P(VDF–HFP) nanofibrous mats synthesized using this method is an excellent ionic liquid (IL) host for electrolyte applications. The IL-based electrolytes in the form of free-standing mats are obtained by immersing SiO2-on-P(VDF–HFP) mats in two types of liquid electrolytes, namely LiClO4/1-butyl-3-methylimidazolium tetrafluoroborate and bis(trifluoromethane)sulfonimide lithium salt/1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. It is found that the surface attached SiO2 nanoparticles can effectively serve as salt dissociation promoters by interacting with the anions of both ILs and lithium salts through Lewis acid–base interactions. They dramatically enhance the ionic conductivity and lithium transference number of the electrolytes. In addition, better compatibility of the electrolytes with lithium electrodes is also observed in the presence of surface-attached SiO2. Using IL-loaded SiO2-on-P(VDF–HFP) nanofibrous mats as the electrolytes, electrochromic devices display higher transmittance contrast, while Li/LiCoO2 batteries show significantly improved C-rate performance and cycling stability. This class of novel non-volatile electrolytes with high ionic conductivity also has the potential to be used in other electrochemical devices. [ABSTRACT FROM AUTHOR]

Published
2015
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