Three-dimensional knotting of W_(17)O_(47)@PEDOT:PSS nanowires enables high-performance flexible cathode for dual-functional electrochromic and electrochemical device  

作　　者：Qi Zhao Jinkai Wang Xinghui Ai Yujuan Duan Zhenghui Pan Shaorong Xie John Wang Yanfeng Gao 

机构地区：[1]Department of Materials Science and Engineering,Shanghai University,Shanghai,China [2]Department of Materials Science and Engineering,National University of Singapore,Singapore,Singapore [3]Department of Computer Engineering and Science,Shanghai University,Shanghai,China

出　　处：《InfoMat》2022年第4期100-111,共12页信息材料（英文）

基　　金：Shanghai Municipal Education Commission,Grant/Award Number:2019-01-07-00-09-E00020;Shanghai Municipal Science and Technology Commission,Grant/Award Number:18JC1412800;Singapore Ministry of Education,Grant/Award Number:MOE2018-T2-2-095。

摘　　要：An efficient integration of electrochromic and electrochemical devices into one flexible entity enables both energy storage and energy-saving dual-functionalities.For this purpose,achieving both high electrochromic and electrochemical performance is the key aspect.Herein,a new 3D architecture is successfully made by knotting W_(17)O_(47)@PEDOT(poly(3,4-ethylenedioxythiophene)):PSS(poly(styrenesulfonate))nanowires with NaWO_(3)nanoknots,and interestingly,the 3D W_(17)O_(47)/(NaWO_(3)-knots)@PEDOT:PSS cathode thus-made simultaneously exhibits a large optical modulation(79.7%at 633 nm),an ultra-long cycling life(76%of original optical modulation retained after 12400 cycles),and a high areal capacitance(55.1 mF cm^(-2)at 0.1 mA cm^(-2)).Our density functional theory(DFT)calculations demonstrate that the much improved dual-functional performance is correlated to the raised electronic conductivity and ion adsorption at the W_(17)O_(47)/(NaWO_(3)nanoknots)interface,together with the ion adsorption of PEDOT:PSS in the 3D-knotted architecture.As a proof-of-concept application,different-sized flexible dual-functional electrochromic/electrochemical devices(FDEDs)were assembled and investigated for various application scenarios,including a smart window(15 cm×10 cm),a wearable wristband(20 cm×2.5 cm),and a smart eyeglass.The smart window made of the FDED enables a large temperature difference of 27.6℃ confirm-tested in model houses,where the energy source also powers three light-emitting diodes(LEDs).The understandings of the key governing principles in the electrodes and dual-functionalities provide a timely foundation for the new generation flexible multifunctional devices.

关 键 词：3D knotting of W_(17)O_(47)@PEDOT:PSS nanowires dual-functionalities electrochromic and electrochemical integration flexible cathode 

分 类 号：TB383[一般工业技术—材料科学与工程] O646[理学—物理化学]