电解质浓度对氧化钨薄膜电致变色性能的影响规律及作用机理  

Influence Law and Mechanism of Electrolyte Concentration on Electrochromic Performance of Tungsten Oxide Films

作　　者：黄树灿 李睿聪 唐岩 陈胜海 周兴龙 林子聪 唐秀凤 关雄聪 Huang Shucan;Li Ruicong;Tang Yan;Chen Shenghai;Zhou Xinglong;Lin Zicong;Tang Xiufeng;Guan Xiongcong(School of Applied Physics and Materials,Wuyi University,Jiangmen 529020,Guangdong,China)

机构地区：[1]五邑大学应用物理与材料学院,广东江门529020

出　　处：《光学学报》2023年第23期317-325,共9页Acta Optica Sinica

基　　金：2022年大学生创新创业训练计划(202211349014);2022年广东省攀登计划(pdjh2022a0524,pdjh2022a0522)。

摘　　要：电解质为电致变色器件的变色提供离子,是器件中不可缺少的一部分。然而,目前对电解质层的研究主要集中在复合电解质和极限浓度,少有探究电解质浓度对电致变色性能的影响规律和机理,尤其是循环稳定性。因此,本文系统研究了高氯酸锂(LiClO_(4))电解质浓度(0.1、0.5、1.0、2.0 mol/L)对氧化钨(WO_(3))薄膜循环前后电致变色性能的影响,及对其循环稳定性的作用机理。结果表明,当LiClO_(4)浓度为1.0 mol/L时,WO_(3)薄膜表现出最短的着色/褪色时间,初始电荷储存量高达25.2 m C·cm^(-2),6000圈伏安(CV)循环后,衰退率仅为25.4%,表现出最佳的循环稳定性。该研究详细介绍了电解质浓度对WO_(3)薄膜电致变色性能及其循环稳定性的影响规律及作用机理,对WO_(3)基电致变色器件的设计和制备具有重要的指导意义。Objective As the main ion supplier of the electrochromic process,the electrolyte layer is one of the most important components for electrochromic devices.Currently,researchers mainly focus on composite electrolyte and limit concentration.There are few studies about the relationship between electrolyte concentration and electrochromic performance,especially cycle stability.Therefore,we aim to investigate the electrochromic performance of tungsten oxide films before and after the cyclic voltammetry-based cycling test in electrolytes with varied lithium perchlorate(LiClO_(4))concentrations(0.1,0.5,1.0,and 2.0 mol/L).The results show that the film using the 1.0 mol/L electrolyte possesses the shortest coloring and fading time.The charge capacity is as high as 25.2 mC∙cm^(-2),and the decay rate of film at 1.0 mol/L electrolyte is only 25.4%after 6000 cycles.We reveal the influence of electrolyte concentration on electrochromic performance,which is of significance for the development and design of tungsten oxide-based electrochromic devices.Methods Tungsten oxide films are prepared on ITO bases by the radio frequency(RF)magnetron sputtering method.The thicknesses of the films are measured by a step meter(Bruker-DektakXT),and the scanning electron microscopy(SEM)images are conducted on Zeiss-Sigma 500 at a voltage of 15 kV.The crystalline structure of tungsten oxide films is examined on an X-ray diffractometer(Philips-X'Pert)by Cu Ka radiation.The LiClO_(4) is dissolved in propylene carbonate(PC)solution to prepare LiClO_(4)-PC electrolytes with varied LiClO_(4) concentrations(0.1,0.5,1.0,and 2.0 mol/L).The response time,cycle performance,and diffusion coefficient of the tungsten oxide film are evaluated by chronoamperometry and cyclic voltammetry tests at a CHI760E electrochemical workstation.The modulation rate is characterized by ultraviolet-visible spectrophotometry(Shimadzu-UV3150).Results and Discussions The prepared amorphous tungsten oxide films exhibit a nano-size peak-like surface structure at a constant thi

关 键 词：电致变色性能 氧化钨 电解质浓度 循环稳定性 

分 类 号：O484[理学—固体物理]