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Nickel oxide electrochromic film and preparation method thereof

An electrochromic, nickel oxide technology, applied in nickel oxide/nickel hydroxide, nanotechnology and other directions, can solve the problems of reducing discoloration effect, limited reaction area, long diffusion time, etc., to enhance electrochemical activity and ensure fast Motion, the effect of increasing the mass transfer rate

Inactive Publication Date: 2012-06-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current nano-electrochromic film basically has a two-dimensional planar structure, the contact between the electrode material and the electrolyte is limited to the outer surface of the electrode material, and the reaction area is limited, which cannot significantly improve the electrode reaction kinetics of NiO.
Although the nanoporous structure can provide more reaction area, the inner pore structure is not conducive to OH - Migrating back and forth between the electrodes only partially increases the switching speed
In addition, the two-dimensional planar film structure of NiO also leads to an outstanding contradictory relationship between the color changing effect and the switching speed.
The two-dimensional planar film structure of NiO determines the diffusion of electrons and ions in the film from the surface to the inside, and the diffusion time is longer. In order to shorten the discoloration time of NiO and meet the practical requirements of electrochromic devices, the film thickness needs to be reduced, but This will reduce the ion storage capacity of the NiO film and reduce the discoloration effect

Method used

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  • Nickel oxide electrochromic film and preparation method thereof
  • Nickel oxide electrochromic film and preparation method thereof
  • Nickel oxide electrochromic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cleaning ITO glass:

[0024] The ITO glass was first cleaned with chloroform for 30 minutes, then ultrasonically cleaned with a mixed solution of isopropanol and acetone with a volume ratio of 1:1, then ultrasonically cleaned with absolute ethanol, finally cleaned with deionized water, and dried to obtain the cleaned glass. ITO glass.

[0025] To prepare the polymer solution:

[0026] A block copolymer polymethyl methacrylate-b-polystyrene (PMMA-b-PS) with an average molecular weight of 263,000 and a homopolymer polymethyl methacrylate (PMMA) with an average molecular weight of 15,000 were dissolved in toluene Forming the solution that the total mass percentage of polymer is 2%, wherein, the quality of polymethyl methacrylate (PMMA) is 10% of the quality of polymethyl methacrylate-b-polystyrene (PMMA-b-PS) .

[0027] Preparation of copolymer nanoporous templates on ITO:

[0028] The polymer solution prepared above was spin-coated on the cleaned ITO glass, the spin-c...

Embodiment 2

[0039] Take the same preparation method as Example 1, its difference is only:

[0040] In preparing the polymer solution, the mass of polymethyl methacrylate (PMMA) is 20% of the mass of polymethyl methacrylate-b-polystyrene (PMMA-b-PS).

[0041] XRD and SEM tests were carried out on the final product, and the results showed that the composition was NiO with good crystallization, the surface of the film was NiO nanowire array, the length of NiO nanowire was 100-200nm, and the average diameter of nanowire was about 54nm.

[0042] The same method as in Example 1 was used to test the electrochromic performance of the final product. In a 0.1 mol / liter KOH solution, 0.65V and 0V square pressure were applied respectively, and the NiO nanowire array film was between transparent and brown. reversible change. Detect its light transmittance change value in the 300-1000nm band, and at the same time use the light transmittance response change at λ=600nm to detect the electrochromic speed...

Embodiment 3

[0045] Take the same preparation method as Example 1, its difference is only:

[0046] In preparing the polymer solution, the mass of polymethyl methacrylate (PMMA) is 30% of the mass of polymethyl methacrylate-b-polystyrene (PMMA-b-PS).

[0047] XRD and SEM tests were carried out on the final product, and the results showed that the composition was NiO with good crystallization, the surface of the film was NiO nanowire array, the length of NiO nanowire was 100-200nm, and the average diameter of nanowire was about 65nm.

[0048] The same method as in Example 1 was used to test the electrochromic performance of the final product. In a 0.1 mol / liter KOH solution, 0.65V and 0V square pressure were applied respectively, and the NiO nanowire array film was between transparent and brown. reversible change. Detect its light transmittance change value in the 300-1000nm band, and at the same time use the light transmittance response change at λ=600nm to detect the electrochromic speed...

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Abstract

The invention discloses a nickel oxide electrochromic film and a preparation method thereof. The nickel oxide electrochromic film is a NiO nanowire array film, the diameter of the NiO nanowire is 5-100 nm, and the length is 50 nm to 5 mu m. The preparation method comprises the following steps of: taking polymethylmethacrylate-b-polystyrene segmented copolymer as a template, preparing a precursor Ni(OH)2 nanowire array in a water solution of Ni(NO3)2 and NaNO3 through the cathode electrodeposition method, dissolving the precursor Ni(OH)2 nanowire array in a toluene solution to remove the template, and carrying out head treatment to obtain the NiO nanowire array film. The nickel oxide electrochromic film has good properties, quick color change, high coloring efficiency and excellent cycling stability. The nickel oxide electrochromic film can be assembled into various electrochromic devices and has broad application prospects in the fields of information storage, architectural glass, smart windows, large screen display and the like.

Description

technical field [0001] The invention belongs to the field of thin film materials, and in particular relates to a nickel oxide electrochromic thin film and a preparation method thereof. Background technique [0002] NiO, WO 3 The representative electrochromic material is one of the most promising smart materials at present. The reversible modulation effect of electrochromic materials on light makes it not only used as goggles, anti-glare mirrors for cars, but also as energy-saving smart glass. A few developed countries have listed it as a new generation of energy-saving materials that focus on development; in addition , Electrochromic materials also have broad application prospects in military camouflage, information storage, electronic display and other fields. The core problem hindering the application of electrochromic materials is how to improve electrochromic properties such as discoloration speed, coloring efficiency and cycle stability, so as to meet the requirements...

Claims

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Application Information

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IPC IPC(8): C03C17/23C01G53/04B82Y40/00
Inventor 袁永锋郭绍义杨金林裴有斌方杰
Owner ZHEJIANG SCI-TECH UNIV
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