TiO2 reflective electrochromic film and preparation method thereof

An electrochromic and reflective technology, applied in the direction of electrolytic coating, electrophoretic coating, titanium oxide/hydroxide, etc., can solve the problem of low optical contrast of electrochromic film, limited application in electrochromic field, unfavorable ion migration, etc. problem, to achieve the effect of improving the kinetic activity of the electrochemical reaction, facilitating large-scale production, and good repeatability

Active Publication Date: 2022-01-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time TiO 2 Electrochromic films have problems such as low optical contrast, slow discoloration, and low reactivity, which severely limit their application in the field of electrochromism.
In particular, the dense titanium dioxide film makes the contact surface between the film and the electrolyte relatively small, so it is not conducive to the ion migration in the electrolyte, making its reaction kinetics poor

Method used

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  • TiO2 reflective electrochromic film and preparation method thereof
  • TiO2 reflective electrochromic film and preparation method thereof
  • TiO2 reflective electrochromic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Put the FTO conductive glass in acetone, absolute ethanol, and deionized water for ultrasonic cleaning, and dry it for later use.

[0041] (1) Mix 27mL of N,N-dimethylformamide (DMF) with 3mL of methanol, add 1.65g of terephthalic acid with magnetic stirring to fully dissolve, then add 1.8mL of tetrabutyl titanate (relative density is 0.996 g / cm 3 ) to continue stirring evenly to obtain a mixed solution, transfer the above mixed solution to a polytetrafluoroethylene-lined reactor, then put the reactor into a blast drying oven at 160°C for solvothermal reaction for 24 hours, after the reaction is completed, The solution in the reaction kettle was collected by centrifugation at 8000r / min, then washed with DMF and methanol for 3 times, and dried to obtain Ti-MOF particles.

[0042] (2) Calcinate Ti-MOF particles at 450°C for 4h, wash and filter, then dry at 60°C for 12h to obtain TiO 2 Particles; take 40mg of the above TiO 2 Particles were ultrasonically dispersed in 80...

Embodiment 2

[0046] Put the FTO conductive glass in acetone, absolute ethanol, and deionized water for ultrasonic cleaning, and dry it for later use.

[0047] (1) Mix 27mL of N,N-dimethylformamide with 3mL of methanol, add 1.65g of terephthalic acid with magnetic stirring to fully dissolve, then add 1.8mL of tetrabutyl titanate (relative density is 0.996g / cm 3 ) to continue stirring evenly to obtain a mixed solution, transfer the above mixed solution to a polytetrafluoroethylene-lined reactor, then put the reactor into a blast drying oven at 160°C for solvothermal reaction for 24 hours, after the reaction is completed, The solution in the reactor was collected by centrifugation at 8000r / min, then washed with DMF and methanol three times, and dried to obtain Ti-MOF particles.

[0048] (2) Calcinate Ti-MOF particles at 500°C for 4h, wash and filter, then dry at 60°C for 12h to obtain TiO 2 Granules; take 32mg of the above TiO 2 Particles were ultrasonically dispersed in 80mL acetone, and T...

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Abstract

The invention discloses a preparation method of a TiO2 reflective electrochromic film. The preparation method comprises the following steps of: preparing Ti-MOF particles by using titanium salt and an organic ligand as raw materials, calcining to obtain micron-sized TiO2 particles with a specific pore structure, and loading the TiO2 particles on conductive glass through electrophoretic deposition to prepare the TiO2 reflective electrochromic film. The prepared TiO2 reflective electrochromic film has loose and porous surface morphology and is formed by stacking the micron-sized TiO2 particles with uniform particle sizes. The TiO2 reflective electrochromic film has a relatively large specific surface area and can establish a stable ion transmission channel, so that reaction active sites are more, the electrochemical reaction kinetic activity is high, and the electrochromic time is short. The TiO2 reflective electrochromic film has a wide application prospect in the fields of intelligent display, intelligent windows and the like.

Description

technical field [0001] The invention relates to the field of electrochromic thin films, in particular to a TiO 2 Reflective electrochromic thin film and its preparation method. Background technique [0002] Under the action of an external electric field, the optical properties of the electrochromic material can undergo stable and reversible changes. The optical properties include transmittance, reflectivity, absorptivity, etc. In appearance, the color of the material changes with the change of the external electric field. . According to the different reaction potentials, electrochromic materials can be divided into anode electrochromic materials and cathode electrochromic materials. Anode electrochromic materials mainly include nickel oxide (NiO), Prussian blue (PB), etc., and cathode electrochromic materials Mainly tungsten trioxide (WO 3 ), titanium dioxide (TiO 2 )Wait. [0003] TiO 2 The research on electrochromic thin films mainly focuses on transmissive thin film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C01G23/053
CPCC25D15/00C01G23/053C01P2002/72C01P2004/03C01P2006/40C01P2002/84
Inventor 刘涌赵方园马晔城徐刚韩高荣
Owner ZHEJIANG UNIV
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