An overview and experimental analysis of WO_(3)/TiO_(2)composite with enhanced electrochromic properties for smart windows application  

作　　者：Ayesha Khan Mayur A.Gaikwad Jin Hyeok Kim Anamika Kadam 

机构地区：[1]The Institute of Science,Dr.Homi Bhabha State University,No.15 Madam Cama Road,Mumbai,400032,India [2]Optoelectronics Convergence Research Center and Department of Materials Science and Engineering,Chonnam National University,Gwangju,61186,South Korea

出　　处：《Tungsten》2024年第4期732-747,共16页钨科技（英文）

基　　金：supported by the Human Resources Development Program(No.20194030202470)of the Korea Institute of Energy Technology Evaluation;Planning(KETEP)with the support of the Korean Government Ministry of Trade,Industry and Energy;the Department of Science and Technology,India,under the DST-FIST(SR/FST/PSI173/2012)program。

摘　　要：Internationally,standards for electrochromic(EC)requirements in smart window applications have been established,with ongoing global initiatives aimed at elevating them to highly advanced levels.This paper covers a comprehensive investigation of the structural,optical,morphological,and electrochemical properties of WO_(3)/TiO_(2)composite films.Simultaneously,an experimental analysis of WO_(3)/TiO_(2)was envisaged by a two-step process.Initially,WO_(3)thin films were hydrothermally deposited onto indium-doped tin oxide-coated glass substrates using an aqueous solution of Na_(2)WO_(4)·2H_(2)O at a pH value of 1.Subsequently,a layer of TiO_(2)was electrodeposited onto the WO_(3)thin films.X-ray diffraction analysis confirmed the successful formation of WO_(3)/TiO_(2)composite films,with the WO_(3)phase exhibiting a hexagonal tunnel structure.Scanning electron microscopy revealed the formation of porous nanorods(NRs)of WO_(3),uniformly coated with TiO_(2),resulting in a porous morphology of the WO./TiO_(2)samples.The EC performance of the WO_(3)/TiO_(2)films was thoroughly assessed through cyclic voltammetry and chronoamperometry measurements over a potential window ranging from-2.0 to+1.2 V(versus Ag/AgCl)in a 0.5 mol·L^(-1)LiClO_(4)-PC electrolyte.The WO_(3)/TiO_(2)composite films exhibited cathodic electrochromism,characterized by a reversible color change from dark blue to transparent.This improved EC performance in comparison to pure WO_(3)films is attributed to enhanced double ion/electron insertion and extraction efficiency.Furthermore,the WO_(3)/TiO_(2)composite films demonstrated excellent optical modulation properties,with a significant modulation at 633 nm(46.87%).The coloration efficiency reached a high value of 193.25 cm^(2)·C^(-1),indicating their potential for practical EC applications.Moreover,the WO_(3)/TiO_(2)composite films displayed exceptional EC stability,with no significant degradation observed over 2500 cyclic voltammetry cycles.This superior EC performance can be attributed to the synergis

关 键 词：ELECTROCHROMISM WO_(3)/TiO_(2) Stability Smart window 

分 类 号：TB33[一般工业技术—材料科学与工程] TU228[建筑科学—建筑设计及理论]