Electrochromic device based on transparent metal mesh electrode

An electrochromic device and transparent metal technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of uneven discoloration of devices, low production yield of time durability, etc., to reduce the influence of ion polarization, improve the Transmittance adjustment ability to achieve electrochromic effect

Pending Publication Date: 2021-11-05

HAINAN UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

However, there is a problem that at this time, on the counter electrode, in addition to Li+ being inserted into NiO, Cu 2+ 、 Bi 3+ Electrodeposition is a strong side reaction, which also causes uneven discoloration of the device

The N...

Abstract

The invention provides an electrochromic device based on a transparent metal mesh electrode. The electrochromic device comprises four layers of structures, namely a first layer, a second layer, a third layer and a fourth layer in sequence, wherein the first layer is transparent conductive glass, the third layer is a zinc mesh or a galvanized metal mesh, the fourth layer is transparent non-conducting glass and is used for placing the third layer, the second layer is a cavity and is used for accommodating an electrolyte which is a complex ion electrolyte generated by a complex reaction of a zinc salt or zinc oxide and a strong base, and the first layer and the third layer are connected with a wire. According to the prepared electrochromic device, the influence of ion polarization is reduced, better deposition uniformity is obtained, the influence of by-products Zn (OH) 2 and ZnO on the reversibility of the device is reduced through the strong base electrolyte, the good transmittance adjusting capacity is achieved, electrochromism is better achieved, and the device is better applied.

Application Domain

Non-linear optics

Technology Topic

PhysicsChemistry +14

Image

Examples

Experimental program(3)
Comparison scheme(4)

Example Embodiment

[0024] Example 1

[0025] like figure 1 Shown, based on the transparent metal electrode is electrically electrochromic device, a four-layer structure composed of a first layer 1 are sequentially provided, a second layer 2, the third layer 3 and fourth layer 4,

[0026] The first layer is a transparent conductive glass as a FTO glass.

[0027] The third layer 3 is a zinc mesh, an inner diameter of 1 to 1000 mesh, a mesh of 5-300 mesh, transparency of 50% to 99%, in the present embodiment, an inner diameter of 50 m mesh, 50 mesh mesh, transparency of 80% to 95%.

[0028] The fourth layer 4 is a transparent non-conductive glass, for placing a third layer 3; the second layer 2 is a cavity for receiving an electrolyte; the first and third layers are connected to wires.

[0029] Preparation steps:

[0030] (1) Preparation of Electrolyte: 0.1mol of the ZnCl 2 A small amount of deionized water was added to the mixture with stirring, then add 1molKOH, while adding while stirring, the resulting reaction complex Zn (OH) 4 2- , And so the reaction was complete, deionized water was added to 1L when the solution became clear, the obtained Zn 0.1M (OH) 4 2- Complex ion electrolyte.

[0031]Preparation of the electrochromic device (2) electrochromic: set the height of the zinc mesh (third layer) is not placed in a transparent conductive glass (fourth layer) using a rubber glue, rubber cement is around 1-5mm, in the present embodiment Example set height of 2mm, the opposite transparent conductive glass (first layer) affixed prepared containing zinc mesh is not transparent conductive glass (a third layer - the fourth layer), and two lead wires, respectively, four weeks with the UV curing adhesive to seal and leave a small opening for injecting the electrolyte, the better to be cured, through a small port with a syringe an electrolyte injected into the cavity (second layer) inside, and finally with an ultraviolet curing adhesive sealing, to obtain Electrolytic zinc metal electrochromic device.

[0032] Working principle: In the initial state, the device of transparent state, then out through the transparent conductive glass and zinc wire grid voltage is applied, the negative pressure is applied (-0.1 ~ -1.2V), the zinc metal is dissolved in the grid electrolyte, the zinc ions are uniformly electrically electrolyte is deposited on the transparent conductive glass, when the deposited zinc layer 20 ~ 30nm is expressed as completely opaque (opacity <5%), so the electrochromic device may be realized from transparent to opaque change.

[0033] When voltage is applied (+ 0.1 ~ 1.2V), deposited on a transparent conductive glass zinc dissolved in the electrolyte, the transparent conductive glass and back to the transparent state, the zinc ions in the electrolyte is electrodeposited on a zinc re grid, mesh zinc transparency change is small, then the electrochromic device may transition from opaque to transparent.

[0034] like figure 2 As shown in Example 1 using the electrical electrochromic device, 0.8V -0.8V deposition 30s then release the transmittance before and after comparison 30s. From the figure, it can be seen that transmittance change of deposition and release, indicating that the device has good transmittance adjustment capability.

[0035] like image 3 As shown in Example 1 using the electrical electrochromic device, i-t test graph constant voltage -0.8V deposited from the figure, the voltage change can be seen that the deposition process, the deposition process showed sustained.

[0036] like Figure 4 As shown in Example 1 using the electrical electrochromic device, i-t test graph peeling 0.8V constant voltage, from the figure, it can be seen that the release voltage change process, indicating that the release device may be reversible.

[0037] Further, on the basis of the embodiment 1, a first transparent conductive glass layer may also be a rigid glass ITO, AZO glass, transparent conductive glass graphene, or nanocrystalline (Pt, Au, ITO) or conductive polymers (poly aniline, polythiophene, polypyrrole) modified FTO glass, glass the ITO, AZO glass, or a transparent flexible conductive electrode (PET / ITO, PET / graphene electrode, PET / conductive polymer); gel electrolyte may also be electrolyte (a gel of the PVA, sodium alginate, cellulose); ZnCI2 2 It can be replaced ZnSO 4 Or ZnO; KOH of NaOH can be replaced; third layer 3 may be replaced with a zinc galvanized metal mesh grid.

Example Embodiment

[0038] Example 2

[0039] Example 1 with the main difference that the electrolyte was prepared: The 0.08mol of ZnCl 2 A small amount of deionized water was added to the mixture with stirring, was added 1.6 mol of KOH, was stirred while adding while complexation reaction of Zn (OH) 4 2- , And so the reaction was complete, deionized water was added to 1L when the solution became clear, the obtained Zn 0.08M (OH) 4 2- Complex ion electrolyte. The results show, reversible, good electrochromic effect.

Example Embodiment

[0040] Example 3

[0041] Example 1 with the main difference that the electrolyte was prepared: 1mol of the ZnCl 2 A small amount of deionized water was added to the mixture with stirring, was added 4.1mol KOH, stirring plus side, complexation reaction of Zn (OH) 4 2- , And so the reaction was complete, deionized water was added to 1L when the solution became clear, the obtained Zn 1M (OH) 4 2- Complex ion electrolyte. The results show, reversible, good electrochromic effect.

PUM

Property	Measurement	Unit
The inside diameter of	1.0 ~ 1000.0	µm
Mesh	5.0 ~ 300.0	mesh
The inside diameter of	50.0	µm

Description & Claims & Application Information

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Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Electrochromic device based on transparent metal mesh electrode

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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