Silane modified composite electrochromic material and preparation method thereof

Abstract

The invention discloses a silane modified composite electrochromic material and a preparation method thereof, and relates to the field of electrochromic materials, and the silane modified composite electrochromic material is composed of tungsten trioxide, polyaniline, a titanium element, a tantalum element, an anilino silane coupling agent, an organic tin catalyst, a conductive substrate, an ethanol aqueous solution and an aniline electrolyte. The tungsten trioxide-titanium dioxide is doped with elements such as titanium and tantalum, the insertion / output quantity of Li < + > can be increased through proper doping, the optimized tungsten trioxide-titanium dioxide further has the rapid dynamic property and the cycling stability, the double-layer composite thin film is characterized in that the inner layer is a tungsten trioxide nanopore array, and the outer layer is a sputtering-deposited tungsten trioxide-titanium doped film; therefore, the response speed and the coloring efficiency can be improved, and the electrochromic performance of the tungsten trioxide film can be improved.

Description

Technical Field

[0001] The present application relates to the field of color-changing materials, and in particular to a silane-modified composite electrochromic material and a preparation method thereof. Background Art

[0002] Silane-modified composite electrochromic material is a material whose electrochromic properties are enhanced by silane modification technology. Electrochromic material refers to a material that can change color under the action of an external electric field. This material has broad application prospects in smart windows, displays, optical devices and other fields.

[0003] The preparation of the silane-modified composite electrochromic material is carried out by adding tungsten trioxide and aniline silane coupling agent into an ethanol aqueous solution to obtain a mixed solution, then dropping the mixed solution on a conductive substrate, and then sending it into an aniline electrolyte for electrochemical precipitation polymerization of aniline, and finally washing and drying to prepare the silane-modified composite electrochromic material.

[0004] In electrochromic materials, the speed of electron movement is one of the key factors affecting their performance. Traditional tungsten trioxide has a large charge transfer impedance, which leads to poor electron movement speed in silane-modified composite electrochromic materials, slow electrochromic response, and long response time. Summary of the invention

[0005] The purpose of the present application is to solve the problem that the traditional tungsten trioxide proposed in the above background technology has a large charge transfer impedance, resulting in poor electron mobility speed, slow electrochromic response and long response time of the silane-modified composite electrochromic material. The present application provides a silane-modified composite electrochromic material and a preparation method thereof.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0007] A silane-modified composite electrochromic material consists of tungsten trioxide, polyaniline, titanium element, tantalum element, aniline-based silane coupling agent, organic tin catalyst, conductive substrate, ethanol aqueous solution and aniline electrolyte.

[0008] A method for preparing a silane-modified composite electrochromic material, the preparation method is as follows:

[0009] S1: Add 1% to 5% of tungsten trioxide and 0.3% to 2% of anilinosilane coupling agent to an ethanol aqueous solution, stir and disperse, then add 0.1% to 0.5% of an organic tin catalyst and stir evenly to obtain a mixed solution;

[0010] S2: then taking out a portion of the mixed solution, adding titanium or tantalum element to the mixed solution, and stirring and mixing to obtain a doped mixed solution;

[0011] S3: then drop-coating the mixed solution on the conductive substrate, and then drying it. After drying, drop-coating the doped mixed solution again and drying it to form a double-layer composite film;

[0012] S4: The conductive substrate is then subjected to electrochemical deposition of polymerized aniline in an aniline electrolyte, and then washed and dried with ultrapure water to complete the preparation of the silane-modified composite electrochromic material.

[0013] Furthermore, the doping mixed solution is added with elements such as titanium and tantalum, and the doping ratio is determined by the actual situation. By doping with elements such as titanium and tantalum, the electrochromic performance of the tungsten trioxide film can be improved. Thus, Li+ and electrons can be injected into / out of the tungsten trioxide film more quickly, and the optimized tungsten trioxide-titanium dioxide also has fast kinetic properties and cycle stability.

[0014] Furthermore, the double-layer composite film is composed of a tungsten trioxide nanopore array film and a sputtering deposited tungsten trioxide doped film, thereby improving the response speed and coloring efficiency.

[0015] Furthermore, the film adopts a nano-array structure, and the nano-array structure is a nano-sphere array, a nano-sheet array or a nano-rod array, so as to facilitate ion exchange.

[0016] Furthermore, the aniline electrolyte contains 0.1-1 mol / l aniline and 0.5-1 mol / l hydrochloric acid, so that polyaniline can be obtained conveniently and quickly.

[0017] Furthermore, the aniline electrolyte adopts a parallel double-pair electrode structure, which can help achieve better color change uniformity on the entire electrochromic fiber.

[0018] In summary, the present application includes at least one of the following beneficial effects:

[0019] 1. In the present application, the electrochromic performance of tungsten trioxide thin film can be improved by doping with titanium, tantalum and other elements. The appropriate amount of doping can increase the insertion / output of Li+. A double-layer composite film is designed, in which the inner layer is a tungsten trioxide nanopore array and the outer layer is a sputtered deposited tungsten trioxide-titanium doped film, which can improve the response speed and coloring efficiency, enable Li+ and electrons to be injected / flowed out of the tungsten trioxide film faster, and the optimized tungsten trioxide-titanium dioxide also has the purpose of fast kinetic properties and cycle stability.

[0020] 2. In the present application, the film adopts a nano-array structure, which is a nano-sphere array, a nano-sheet array or a nano-rod array. The nano-array structure can provide a larger contact area with the electrolyte, so that tungsten trioxide can provide a large number of particle binding sites, thereby achieving the purpose of facilitating ion exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the preparation method in this application. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 This application is described in further detail.

[0023] The embodiments of the present application disclose a silane-modified composite electrochromic material and a preparation method thereof.

[0024] A silane-modified composite electrochromic material consists of tungsten trioxide, polyaniline, titanium element, tantalum element, aniline-based silane coupling agent, organic tin catalyst, conductive substrate, ethanol aqueous solution and aniline electrolyte.

[0025] A method for preparing a silane-modified composite electrochromic material, the preparation method is as follows:

[0026] S1: Add 1% to 5% of tungsten trioxide and 0.3% to 2% of anilinosilane coupling agent to an ethanol aqueous solution, stir and disperse, then add 0.1% to 0.5% of an organic tin catalyst and stir evenly to obtain a mixed solution;

[0027] S2: then taking out a portion of the mixed solution, adding titanium or tantalum element to the mixed solution, and stirring and mixing to obtain a doped mixed solution;

[0028] S3: then drop-coating the mixed solution on the conductive substrate, and then drying it. After drying, drop-coating the doped mixed solution again and drying it to form a double-layer composite film;

[0029] S4: The conductive substrate is then subjected to electrochemical deposition of polymerized aniline in an aniline electrolyte, and then washed and dried with ultrapure water to complete the preparation of the silane-modified composite electrochromic material.

[0030] Elements such as titanium and tantalum are added to the doping mixed solution, and the doping ratio is determined by the actual situation. By doping with elements such as titanium and tantalum, the electrochromic properties of the tungsten trioxide film can be improved. The appropriate amount of doping can increase the insertion / output of Li+, so that Li+ and electrons can be injected / flowed out of the tungsten trioxide film faster. The optimized tungsten trioxide-titanium dioxide also has fast kinetic properties and cycle stability.

[0031] The double-layer composite film is composed of a tungsten trioxide nanopore array film and a sputtered tungsten trioxide doped film. By designing a double-layer composite film, the inner layer is a tungsten trioxide nanopore array, and the outer layer is a sputtered tungsten trioxide-titanium doped film, which can improve the response speed and coloring efficiency.

[0032] The film adopts a nano-array structure, which is a nano-sphere array, a nano-sheet array or a nano-rod array. By adopting a nano-array structure, the nano-array structure can provide a larger contact area with the electrolyte, so that tungsten trioxide can provide a large number of particle binding sites, which is conducive to ion exchange.

[0033] The aniline electrolyte contains 0.1-1 mol / l aniline and 0.5-1 mol / l hydrochloric acid. Polyaniline, as a conductive polymer material, is considered to be the most likely electrochromic polymer to be used in practice due to its low conversion voltage, good reversibility and rich color changes. In the process of electrochemical synthesis of polyaniline, aniline monomers are formed into polyaniline by electropolymerization in the electrolyte, so that polyaniline can be obtained conveniently and quickly.

[0034] The aniline electrolyte adopts a parallel double-pair electrode structure. The parallel double-pair electrode structure can provide a more uniform potential distribution, which can help achieve better color change uniformity on the entire electrochromic fiber.

Claims

1. A silane-modified composite electrochromic material, characterized in that: The silane-modified composite electrochromic material consists of tungsten trioxide, polyaniline, titanium element, tantalum element, aniline-based silane coupling agent, organic tin catalyst, conductive substrate, ethanol aqueous solution and aniline electrolyte.

2. A method for preparing a silane-modified composite electrochromic material, characterized in that: The preparation method is as follows: S1: Add 1% to 5% of tungsten trioxide and 0.3% to 2% of anilinosilane coupling agent to an ethanol aqueous solution, stir and disperse, then add 0.1% to 0.5% of an organic tin catalyst and stir evenly to obtain a mixed solution; S2: then taking out a portion of the mixed solution, adding titanium or tantalum element to the mixed solution, and stirring and mixing to obtain a doped mixed solution; S3: then drop-coating the mixed solution on the conductive substrate, and then drying it. After drying, drop-coating the doped mixed solution again and drying it to form a double-layer composite film; S4: The conductive substrate is then subjected to electrochemical deposition of polymerized aniline in an aniline electrolyte, and then washed and dried with ultrapure water to complete the preparation of the silane-modified composite electrochromic material.

3. The method for preparing a silane-modified composite electrochromic material according to claim 2, characterized in that: Elements such as titanium and tantalum are added to the doping mixed solution, and the doping ratio is determined by actual conditions.

4. The method for preparing a silane-modified composite electrochromic material according to claim 2, characterized in that: The double-layer composite film consists of a tungsten trioxide nanopore array film and a sputtering deposited tungsten trioxide doped film.

5. The method for preparing a silane-modified composite electrochromic material according to claim 4, characterized in that: The film adopts a nano array structure, and the nano array structure is a nano sphere array, a nano sheet array or a nano rod array.

6. The method for preparing a silane-modified composite electrochromic material according to claim 2, characterized in that: The aniline electrolyte contains 0.1-1 mol / l aniline and 0.5-1 mol / l hydrochloric acid.

7. The method for preparing a silane-modified composite electrochromic material according to claim 6, characterized in that: The aniline electrolyte adopts a parallel double-pair electrode structure.

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