CN213122541U

CN213122541U - Flexible electrochromic device

Info

Publication number: CN213122541U
Application number: CN202022354649.7U
Authority: CN
Inventors: 张守仁; 冯同; 白丹丹; 杨保成; 王建方
Original assignee: Henan Najing Technology Co ltd
Current assignee: Henan Najing Technology Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-05-04
Anticipated expiration: 2030-10-21

Abstract

A flexible electrochromic device belongs to the technical field of electrochromic intelligent windows and comprises two PET-ITO substrates, and a PANI electrochromic layer and a PEDOT ion storage layer which are respectively arranged on the ITO surfaces of the two PET-ITO substrates, wherein the PEDOT ion storage layer and the PANI electrochromic layer are connected through a gel electrolyte layer. The utility model discloses a portable electrical power generating system can be very big extends electrochromic device's application universality. The thickness of the whole device is within 2mm, the device is very light and convenient, and the color change speed is very high.

Description

Flexible electrochromic device

Technical Field

The utility model belongs to electrochromic intelligence window field, concretely relates to flexible electrochromic device.

Background

With the development of society and the improvement of living standard of people, the daily life of people is being changed profoundly by intelligent devices, and color-changing intelligent windows, intelligent sunglasses and automobile rearview mirrors based on optical regulation and control and the application thereof in the energy-saving field of aerospace buildings begin to become new consumption hotspots and economic growth points. Based on the NanoMarkets industry analysis company data, the market value of electrochromic glass is expected to reach $ 22 billion by 2020 and exceed $ 30 billion by 2022. Only two companies, namely SAGE and VIEW, in the United states realize the industrialized production of all-solid electrochromic glass, and the companies have monopoly on technology and equipment and are expensive. At present, the intelligent glass scale manufacturing technology is not completely mastered in China, and the market share of products is extremely low. The development of the fields of rapidly developing energy-saving buildings, high-speed rails, new energy automobiles and the like puts new requirements on light weight, compound functionalization, slaving performance and the like of glass on the basis of intellectualization. Therefore, the key point is that China accelerates the development of the electrochromic intelligent window industry.

The electrochromic matrix materials on the market at present are mainly inorganic transition metal oxides and organic conjugated polymers. At present, electrochromic devices based on tungsten trioxide are gradually commercialized, but the commercial development of the electrochromic devices is greatly limited due to the disadvantages of low discoloration efficiency, slow response speed, high switching potential and the like of the transition metal oxides. Although nanoscale metal oxides may improve their performance to some extent, the fabrication of large-area nanostructured thin films presents difficulties. Compared with inorganic color-changing materials, the organic conjugated polymer is easier to design and optimize, has more excellent electrochromic performance, and can overcome the limitation of metal oxides to a certain extent. As one of polymer electrochromic materials, Polyaniline (PANI) has the advantages of simple synthesis, low price, high conductivity, good environmental stability and cycle reversibility, and the like, and becomes one of the most interesting conductive polymer materials. Polyaniline is doped and dedoped in a special structure to form different oxidation states, and the color of PANI can be changed from yellow in a fully reduced state (LE) to green in a doped partial oxidation state (ES) and blue in an undoped partial oxidation state (EB) and purple in a fully oxidized state (Pernigraniline).

The flexible electronic device is an electronic device made of flexible materials, has good flexibility and ductility, can be bent and folded freely, has flexible and various structural forms, can be arranged randomly according to the requirements of measurement conditions, has great application value in the fields of electronic skin, health monitoring, electronic and electrician, sports equipment, textiles, environment monitoring and the like, and becomes one of the current popular research fields and is developed rapidly. The flexible electrochromic intelligent window has the advantages of smaller volume, lighter weight and random attachment on the surface of a non-planar object, and is widely concerned.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a flexible electrochromic device with simple preparation method, easy encapsulation, low cost and controllable transmittance and color-changing area on the basis that polyaniline is an electrochromic film.

Based on the above-mentioned purpose, the utility model discloses take following technical scheme:

the flexible electrochromic device is characterized by comprising two PET-ITO substrates, and a PANI electrochromic layer and a PEDOT ion storage layer which are respectively arranged on ITO surfaces of the two PET-ITO substrates, wherein the PEDOT ion storage layer and the PANI electrochromic layer are connected through a gel electrolyte layer.

Further, the gel electrolyte layer is LiClO₄A PMMA/PC gel electrolyte layer.

Further, the thicknesses of the PANI electrochromic layer, the gel electrolyte layer and the PEDOT ion storage layer are 950nm, 1mm and 400nm in sequence.

The utility model discloses a portable electrical power generating system can be very big extends electrochromic device's application universality. The thickness of the whole device is within 2mm, the device is very light and convenient, and the color change speed is very high.

Drawings

Fig. 1 is a schematic structural diagram of a flexible electrochromic device according to the present invention;

FIG. 2 is a graph of the transmittance of the device in the colored and bleached states;

fig. 3 is a test plot of the electrochromic time of the device.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

As shown in fig. 1, the flexible electrochromic device comprises a first PET-ITO substrate 1, a second PET-ITO substrate 5, a PANI electrochromic layer 2 arranged on the ITO surface of the first PET-ITO substrate 1, and a PEDOT ion storage layer 4 arranged on the ITO surface of the second PET-ITO substrate 5, wherein the PEDOT ion storage layer 4 and the PANI electrochromic layer 2 are connected through a gel electrolyte layer 3.

Further, the gel electrolyte layer 3 is LiClO₄A PMMA/PC gel electrolyte layer.

The preparation process of the flexible electrochromic device is as follows:

(1) the flexible conductive film PET-ITO (the utility model discloses the PET-ITO that adopts buys from south China Hunan City science and technology Limited company, and thickness is 185nm, and the square resistance is for being less than or equal to 6 omega, and the transmissivity is greater than or equal to 80%) weathers with high-purity nitrogen gas after 20 min with ultrapure water, acetone, ethanol and difference ultrasonic cleaning, puts into the plasma cleaning ware with the ITO conductive surface up, takes out after plasma cleaning 3 minutes. And (3) putting the cleaned ITO glass into a three-electrode electrolytic cell, adding an electrochemical deposition solution, and depositing in a three-electrode system by an electrochemical volt-ampere circulation method. ITO glass is used as a working electrode, a platinum sheet is used as a counter electrode, a Saturated Calomel Electrode (SCE) is used as a reference electrode, wherein the scanning potential range of Cyclic Voltammetry (CV) is-0.2V-1.2V, and the scanning speed is 50 mV s^-1And depositing a polyaniline electrochromic film with uniform appearance and color, and drying the polyaniline electrochromic film in a vacuum drying oven to obtain the PANI electrochromic layer with the thickness of 950 nm.

Specific preparation processes can be referred to documents d, Zhou, b.y. Che, x.h. Lu, j. mater. chem. C,2017, 5, 1758.

(2) PEDOT is prepared on PET-ITO by adopting an electrochemical deposition method, the thickness is 400nm, and the specific process can be referred to documents J.H. Kang, Y.J. Oh, S.M. Paek, and Solar Energy Materials & Solar Cells 93 (2009) 2040-.

(3) For The preparation of gel state electrolytes, reference is made in particular to The documents S.H. Zhang, S.Chen, Y.H. ZHao, Journal of The Electrochemical Society, 166 (2) H77-H86 (2019).

(4) Preparation of flexible electrochromic device

Respectively adopting PANI as a working electrode, PEDOT as a counter electrode, taking the prepared gel electrolyte as an electrolyte, sticking a double-sided tape around the PANI, and dripping into a groove (4 cm groove area) stuck with the double-sided tape (1 mm thickness) by using a dropper²) Then, PEDOT was covered on top to minimize gel overflow and to prevent bubbles from occurring in the electrolyte, and a conductive tape was attached to the ITO glass as a wire. And (4) after the device is prepared, beating epoxy resin glue on the periphery of the device by using a glue gun for waterproof insulation, and thus obtaining the device.

(5) Development of portable dry cell power supply system

In order to facilitate the use of electrochromic devices, corresponding portable energy storage power systems have been developed, which include a battery pack for supplying power to the system, a parallel capacitor connected to the battery pack for increasing the speed of applying voltage, and a boat-shaped switch.

Test method of electrochromic device

The photoelectric properties of the electrochromic device were tested by means of a uv spectrophotometer in combination with a CHI 760E electrochemical workstation. The ultraviolet spectrophotometer selects a liquid phase mode for testing, the electrochemical workstation adopts a double-electrode mode for testing, and the testing voltage range is-1V-1.2V.

Results of the experiment

At present, the research and development processes of materials and devices are completed, the positive electrode of the flexible electrochromic film is driven by a direct current power supply system, a transparent conductive layer is led out through a copper foil adhesive tape, the negative electrode of the flexible electrochromic film is connected with another transparent conductive layer through a bonded copper foil, and the color change efficiency of the electrochromic film is controlled by adjusting the voltage of a direct current power supply, so that as shown in fig. 2 and fig. 3, fig. 2 shows the transmittance of the device in the full spectrum range of a colored state and a faded state, as can be seen from the figure, the light transmittance difference of the device at a waveband of 565nm is approximately 25%, as can be seen from fig. 3, when the voltage is 1V, the device is changed from colorless to dark color; then the anode and the cathode of the power supply are exchanged, and the voltage is regulated to-1V, so that the device is colorless again. The color changing speed is about 5S, and the method has wide application prospect in the application of intelligent windows.

Finally, compared with other electrochromic devices, the device prepared by the utility model has the advantages of high contrast, low manufacturing cost, simple process, wide working temperature range, low driving voltage, rich colors and the like. The optimization of the color change response time, the change times and the like meets the engineering application.

The above embodiments are intended to illustrate rather than to limit the technical solution of the present invention, and although the present invention has been described with reference to preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. The flexible electrochromic device is characterized by comprising two PET-ITO substrates, and a PANI electrochromic layer and a PEDOT ion storage layer which are respectively arranged on ITO surfaces of the two PET-ITO substrates, wherein the PEDOT ion storage layer and the PANI electrochromic layer are connected through a gel electrolyte layer.

2. The flexible electrochromic device of claim 1, wherein the gel electrolyte layer is LiClO₄A PMMA/PC gel electrolyte layer.

3. The flexible electrochromic device according to claim 1 or 2, wherein the PANI electrochromic layer, the gel electrolyte layer and the PEDOT ion storage layer have thicknesses of 950nm, 1mm and 400nm in sequence.