复合电极互补型电致变色器件的制备与性能研究

发布时间：2018-03-10 06:37

本文选题：水热法　切入点：WO_3薄膜　出处：《东华大学》2017年硕士论文　论文类型：学位论文

【摘要】：电致变色材料是指在外加电压的作用下可以实现光学性质可逆变化的一类材料。电致变色器件是由电致变色材料、电解质和对电极组成的,其在智能窗、显示和汽车反光镜等领域的应用具有重要意义。智能窗不仅可以提升传统玻璃窗的美观度,还可以通过控制玻璃窗两侧光透过率而起到节能作用。单电极的电致变色材料往往具有其无法克服的缺点,而复合电致变色材料却可以弱化单一材料的缺点,实现材料优势的累加,因此复合电致变色材料已成为电致变色材料最活跃的研究领域之一。相比于单电极电致变色器件,互补型电致变色器件可以实现阴极和阳极电致变色材料之间电荷转移平衡,从而可以得到更好的电致变色性能,在智能窗和显示等方面具有的实际应用价值。本论文以阴极和阳极电致变色材料复合薄膜的制备及组装互补型器件为研究对象,主要开展了以下三个方面的工作:(1)以乙二醇作为结构导向剂,采用水热法,在FTO导电玻璃上制备出具有架状结构的WO_3?0.33H_2O薄膜。这种结构可以显著增大电致变色层与电解液的接触面积,从而大大缩短了离子的迁移路径,提高离子传输效率。按照(PEDOT:PSS):乙醇=1:2的比例将(PEDOT:PSS)稀释,采用旋涂法将稀释液负载到WO_3?0.33H_2O薄膜上。对WO_3?0.33H_2O薄膜和WO_3?0.33H_2O/PEDOT:PSS复合电致变色薄膜分别进行电化学性能测试,相比于单层WO_3?0.33H_2O薄膜,含PEDOT:PSS的薄膜的阳极电流密度增大了45%,阴极电流密度增大16%,呈现出更快地离子扩散速率。对其组装的电致变色器件进行电致变色性能测试发现,含PEDOT:PSS复合电极的光调制范围与响应速度等方面都有明显的提高与优化。(2)通过水热法在FTO导电玻璃上制备了NiO电致变色薄膜。以硫酸铵作为结构导向剂,制得的NiO薄膜呈直立生长的片状结构。垂直生长的纳米片交错连接形成多孔洞结构,这种独特的结构为电致变色离子传输过程提供了较大的反应活性面积。采用电沉积的方法在NiO薄膜上复合一层PB,制得NiO/PB复合薄膜。将单层的NiO薄膜电极和NiO/PB薄膜电极分别组装器件,测试器件的电致变色性能。与单层的NiO薄膜器件相比,复合薄膜组装的器件光调制范围和着色效率等都有显著的提高。(3)为了测试复合电致变色薄膜的电致变色性能,对薄膜进行了器件封装,分别为glass/FTO/WO_3?0.33H_2O/PEDOT:PSS/LiClO_4-PC/PB/NiO/FTO/glass,glass/FTO/WO_3?0.33H_2O/LiClO_4-PC/NiO/FTO/glass,并分别研究了器件的电致变色性能。结果显示,复合电极的互补型电致变色器件具有卓越的电致变色性能,其光调制范围可以达到52%(700 nm),着色和褪色时间分别为6 s和7.5 s,着色效率可以达到121 cm2/C。复合电极互补型电致变色器件在实际应用方面具有更好的发展前景。
[Abstract]:Electrochromic material is a kind of material which can realize the reversible change of optical property under the action of applied voltage. The electrochromic device is composed of electrochromic material, electrolyte and opposite electrode. Applications in fields such as display and automotive mirrors are of great significance. Smart windows not only enhance the beauty of traditional glass windows, The single electrode electrochromic material often has its insuperable disadvantages, while the composite electrochromic material can weaken the disadvantage of a single material. Therefore, composite electrochromic materials have become one of the most active research fields of electrochromic materials. The complementary electrochromic device can realize the charge transfer balance between cathode and anode electrochromic material, thus obtaining better electrochromic performance. In this thesis, the preparation and assembly of the cathode and anode electrochromic composite films are the object of study. The main work of this paper is as follows: (1) with ethylene glycol as the structure guide, WO _ 3s with scaffold structure were prepared on FTO conductive glass by hydrothermal method. 0.33H2O thin film. This structure can significantly increase the contact area between electrochromic layer and electrolyte, thus greatly shorten the ion migration path and improve the ion transport efficiency. The diluent was loaded into WO3s by spin coating method. 0.33H2O thin film. 0.33 H2O thin films and WOCs 3? The electrochemical properties of 0.33H _ 2O / PEDOT: PSS composite electrochromic films were measured respectively, compared with those of the monolayer WO _ s _ 3? 0.33H _ 2O thin film, the anode current density of the thin film containing PEDOT:PSS increases by 45% and the cathode current density increases by 16%, showing a faster ion diffusion rate. The electrochromic properties of the assembled electrochromic device are tested. The photomodulation range and response speed of the composite electrode containing PEDOT:PSS have been improved and optimized. The photochromic film of NiO was prepared on FTO conductive glass by hydrothermal method. Ammonium sulfate was used as the structure guide. The NiO films were grown vertically, and the perpendicular nanochips were interlaced to form porous structures. This unique structure provides a large reactive area for the electrochromic ion transport process. NiO/PB composite thin films were prepared by electrodeposition on NiO thin films. Single layer NiO thin film electrodes and NiO/PB thin films were prepared. Electrode assembly device, Compared with single-layer NiO thin film devices, the photomodulation range and coloring efficiency of composite thin film assembled devices are significantly improved. (3) in order to test the electrochromic properties of composite electrochromic films, The thin films were encapsulated as glass-r / FTO / WO _ s _ 3? 0.33H _ 2O / PEO _ 2O / PSS _ P _ S _ I _ O _ _ _. 0.33H _ 2O / LiClO _ S _ 4-PC-Ni _ O / FTO / glassass. the electrochromic properties of the devices have been studied separately. The results show that the complementary electrochromic devices with composite electrodes have excellent electrochromic properties. The photomodulation range can reach 52nm and 700 nm, the coloring and fading time are 6 s and 7.5 s, respectively, and the coloring efficiency can reach 121 cm 2 / C. the complementary electrochromic device with composite electrode has a better prospect in practical application.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN383.1;TB34

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