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Copolymerization of Azobenzene-bearing Monomer and 3,4-Ethylenedioxythiophene(EDOT): Improved Electrochemical Performance for electrochromic device Applications

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Chinese Journal of Polymer Science 2020年第2期38卷 109-117,I0004页

作者： Serife O.Hacioglu Iskenderun Technical University Department of Engineering Science

In this study,novel electrochromic copolymers of 3,4-ethylenedioxythiophene(EDOT)and(E)-1,2-bis(2-fluoro-4-(4-hexylthiophen-2-yl)phenyl)diazene(M1)with different monomer feed ratios were designed and synthesized *** and spectroelectrochemical characterizations were performed using voltammetry and UV-Vis-NIR spectrophotometry techniques to test the applicability of copolymers for electrochromic *** terms of electrochemical behaviors,addition of an electron-rich EDOT unit into the azobenzenecontaining copolymer increased the electron density on the polymer chain and afforded copolymers with very low oxidation potentials at around0.30 *** the homopolymers(P1 and PEDOT)exhibited neutral state absorptions centered at 510 and 583 nm,EDOT-bearing copolymers showed red shifted absorptions compared to those of P1 with narrower optical band *** addition,the poor optical contrast and switching times of azobenzene-bearing homopolymer were significantly improved with EDOT addition into the copolymer *** a result of the promising electrochromic and kinetic preperties,Co P1.5-bearing single layer electrochromic device that works between purple and light greenish blue colors was constructed and characterized.

关键词： Azobenzene EDOT Copolymerization electrochromic device

A high-performance electrochromic device assembled with WO_(3)/Ag and TiO_(2)/NiO composite electrodes towards smart window

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Frontiers of Materials Science 2024年第1期18卷 123-135页

作者： Haorui Liu Jikai Yang Decai Nie Chunlei Liu Liumenghan Zheng Yining Mu Weijun Chen Chongqing Research Institute Changchun University of Science and TechnologyChongqing 400000China School of Physics Changchun University of Science and TechnologyChangchun 130022China

The choice of cathode and anode materials for electrochromic devices plays a key role in the performance of electrochromic smart *** this research,WO_(3)/Ag and TiO_(2)/NiO composite thin films were separately prepared by the hydrothermal method combined with *** electrochromic properties of the single WO_(3) thin film were optimized,and TiO_(2)/NiO composite films showed better electrochromic performance than that of the single NiO ***_(3)/Ag and TiO_(2)/NiO composite films with excellent electrochromic properties were respectively chosen as the cathode and the anode to construct a WO_(3)/Ag‒TiO_(2)/NiO electrochromic *** response time(tc=4.08 s,tb=1.08 s),optical modulation range(35.91%),and coloration efficiency(30.37 cm^(2)·C^(-1))of this electrochromic device are better than those of WO_(3)-NiO and WO_(3)/Ag-NiO electrochromic *** work provides a novel research idea for the performance enhancement of electrochromic smart windows.

关键词： WO_(3)/Ag composite film TiO_(2)/NiO composite film electrochromic device

Li_(x)Na_(2-x)W_(4)O_(13) nanosheet for scalable electrochromic device

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Frontiers of Optoelectronics 2021年第3期14卷 298-310页

作者： Yucheng LU Xin YANG Hongrun JIN Kaisi LIU Guoqun ZHANG Liang HUANG Jia LI Jun ZHOU Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Shenzhen Geirn Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

The printed electronics technology can be used to efficiently construct smart devices and is dependent on functional inks containing well-dispersed active ***-dimensional(2D)materials are promising functional ink candidates due to their superior ***,the majority 2D materials can disperse well only in organic solvents or in surfactant-assisted water solutions,which limits their ***,we report a lithium(Li)-ion exchange method to improve the dispersity of the Na_(2)W_(4)O_(13) nanosheets in pure *** Li-ion-exchanged Na_(2)W_(4)0_(13)(Li_(x)Na_(2-x)W_(4)O_(13))nanosheets show highly stable dispersity in water with a zeta potential of-55 ***,this aqueous ink can be sprayed on various substrates to obtain a uniform LixNa2_xW4O13 nanosheet film,exhibiting an excellent electrochromic performance.A complementary electrochromic device containing a Li_(x)Na_(2-x)W_(4)O_(13) nanosheet film as an electrochromic layer and Prussian white(PW)as an ion storage layer exhibits a large optical modulation of 75% at 700 nm,a fast switching response of less than 2 s,and outstanding cyclic *** Na2W4Oi3-based aqueous ink exhibits considerable potential for fabricating large-scale and flexible electrochromic devices,which would meet the practical application requirements.

关键词： printed electronics technology two-dimensional material ink ion exchange electrochromic device

Preparation of a Star Network PEG-based Gel Polymer Electrolyte and Its Application to electrochromic devices

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Chinese Journal of Chemistry 2007年第11期25卷 1743-1747页

作者：龚永峰傅相锴张树鹏蒋庆龙 Research Institute of Applied Chemistry College of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China The Key Laboratory of Applied Chemistry of Chongqing Municipality Chongqing 400715 China

A star network polymer with a pentaerythritol core linking four PEG-block polymeric arms was synthesized, and its corresponding gel polymer electrolyte based on lithium perchlorate and plasticizers EC/PC with the character being colorless and highly transparent has been also prepared. The polymer host was characterized and confirmed to be of a star network and an amorphous structure by FTIR, ^1H NMR and XRD studies. The polymer host hold good mechanical properties for pentaerythritol cross-linking. Maximum ionic conductivity of the prepared polymer electrolyte has reached 8.83 × 10 ^-4 S·cm^-1 at room temperature. Thermogravimetry （TG） of the polymer electrolyte showed that the thermal stability was up to at least 150 ℃. The gel polymer electrolyte was further evaluated in electrochromic devices fabricated by transparent PET-ITO and electrochromically active viologen derivative films, and its excellent performance promised the usage of the gel polymer electrolyte as ionic conductor material in electrochrornic devices.

关键词： ionic conductivity star network polymer gel polymer electrolyte electrochromic device

Bifunctional flexible electrochromic energy storage devices based on silver nanowire flexible transparent electrodes

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International Journal of Extreme Manufacturing 2023年第1期5卷 307-316页

作者： He Zhang Fangyuan Sun Ge Cao Dongyan Zhou Guofan Zhang Jiayun Feng Shang Wang Fengyu Su Yanqing Tian Yan Jun Liu Yanhong Tian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055People’s Republic of China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055People’s Republic of China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Key Laboratory of Energy Conversion and Storage Technology(Southern University of Science and Technology) Ministry of EducationShenzhen 518055People’s Republic of China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450041People’s Republic of China

Flexible electrochromic energy storage devices(FECESDs)for powering flexible electronics have attracted considerable *** nanowires(AgNWs)are one kind of the most promising flexible transparent electrodes(FTEs)materials for the emerging flexible ***,fabricating FECESD based on AgNWs FTEs is still hindered by their intrinsic poor electrochemical *** address this issue,a hybrid AgNWs/Co(OH)_(2)/PEDOT:PSS electrode is *** PEDOT:PSS could not only improve the resistance against electrochemical corrosion of AgNWs,but also work as functional layer to realize the color-changing and energy storage ***,the Co(OH)_(2)interlayer further improved the color-changing and energy storage *** on the improvement,we assembled the symmetrical *** the same condition,the areal capacitance(0.8 mF cm^(−2))and coloration efficiency(269.80 cm^(2)C−1)of AgNWs/Co(OH)_(2)/PEDOT:PSS FECESDs were obviously higher than AgNWs/PEDOT:PSS ***,the obtained FECESDs exhibited excellent stability against the mechanical *** areal capacitance remained stable during 1000 times cyclic bending with a 25 mm curvature *** results demonstrated the broad application potential of the AgNWs/Co(OH)_(2)/PEDOT:PSS FECESD for the emerging portable and multifunctional electronics.

关键词： electrochromic device energy storage device silver nanowires flexible transparent electrode