High-performance carbon nitrogen compound/polyoxometallate composite material electrochromic device

A polyoxometalate, electrochromic device technology, applied in instruments, nonlinear optics, optics, etc., to achieve the effects of easy operation, reduced voltage range, and simple process

Pending Publication Date: 2022-07-08
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of preparing a high-performance carbonitride / polyoxometalate composite electrochromic device, the present invention improves the electrochromic performance of the device by improving the working electrode

Method used

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  • High-performance carbon nitrogen compound/polyoxometallate composite material electrochromic device
  • High-performance carbon nitrogen compound/polyoxometallate composite material electrochromic device
  • High-performance carbon nitrogen compound/polyoxometallate composite material electrochromic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 High-performance carbonitride / polyoxometalate composite electrochromic device

[0028] (1) The preparation method is as follows

[0029] 1. Preparation of working electrode

[0030] ①Carbonitride Ti 3 C 2 T X Preparation of MXenes

[0031] 1 g of lithium fluoride (LiF, AR) was added to 10 mL of hydrochloric acid (HCl, 86%), and after stirring at 35 °C for 5 min, 0.5 g of Ti was slowly added3 AlC 2 powder, and continued stirring at 35°C for 24h. After the reaction, the product was centrifuged and washed with deionized water until the pH was 6, centrifuged and washed, the obtained precipitate was dissolved in 10 mL of deionized water, sonicated for 10 min, and the obtained suspension was centrifuged at 2000 rpm for 10 min to obtain Ti. 3 C 2 T X MXene solution with a concentration of 3.2 g / mL and an average flake size of 1 μm.

[0032] ②Keggin type polyacid K 6 [α-P 2 W 18 O 62 ]·14H 2 O(P 2 W 18 ) preparation

[0033] 30g Na 2 WO 4 ·2H 2 O...

Embodiment 2

[0047] Example 2 High-performance carbonitride / polyoxometalate composite electrochromic device

[0048] (1) The preparation method is as follows

[0049] 1. Preparation of working electrode

[0050] ①Carbonitride Ti 3 C 2 T X Preparation of MXenes

[0051] Same as Example 1

[0052] ②Keggin type polyacid K 6 [α-P 2 W 18 O 62 ]·14H 2 O(P 2 W 18 ) preparation

[0053] Same as Example 1

[0054] ③Ti 3 C 2 T X / P 2 W 18 Preparation of composite membranes

[0055] Add polyvinyl alcohol (PVA) powder into deionized water at a ratio of 5 mg:100 mL of material to liquid, and stir magnetically at 120° C. until PVA is completely dissolved in water to obtain a PVA crosslinking agent solution.

[0056] Ti 3 C 2 T X The MXene solution (3.2 g / mL) was placed in a cell crusher in an ice-water bath, and sonicated at 300 W for 30 min. Ti before and after crushing 3 C 2 T X The MXene solutions were named MX S and MX WS, respectively.

[0057] Take 2g P 2 W 18 Powd...

Embodiment 3

[0066] The prepared MX S / P 2 W 18 The working electrode of the composite film device or the MX WS / P2W18 composite film device is the positive electrode, and the counter electrode is the negative electrode for testing. The applied voltage is 1.5~-1.5V, the period is 50s, and the positive voltage and negative voltage are applied for the same time. In-meter test at 576nm with MX S / P 2 W 18 Composite film, MX WS / P 2 W 18 The charge-discharge curves of the device prepared with the composite film as the working electrode are as follows: Figure 3b shown. Depend on Figure 3b Visible, MX S / P 2 W 18 The charge-discharge curve of the composite film device is larger than that of the MX WS / P2W18 composite film device, which indicates that the MX S / P 2 W 18 The mass specific capacitance of the composite film device is higher, the calculated MX S / P 2 W 18 The mass specific capacitance of the composite membrane device is 5F / g. Ti used in this device 3 C 2 T X / P 2 W 18 The...

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Abstract

The invention discloses a high-performance carbon nitrogen compound/polyoxometallate composite material electrochromic device and a preparation method thereof. The electrochromic device comprises a working electrode, an electrolyte and a counter electrode, the working electrode is formed by covering an electrochromic layer on FTO (Fluorine-doped Tin Oxide) glass, and the electrochromic layer is a carbon nitrogen compound/polyoxometallate composite film; the electrolyte is a solution or sol containing active ions Li < + >; the counter electrode is formed by covering a charge balance layer on FTO glass, and the charge balance layer is a metal oxide film. The electrochromic device disclosed by the invention has excellent performance in light modulation, response time and coloring efficiency, and can still be colored and faded in the same polarity voltage range, so that the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a high-performance MXene / polyoxometalate composite material electrochromic device. Background technique [0002] With the rise of low-carbon environmental protection concepts such as carbon peaking and carbon neutrality, the development of new energy-saving devices is a current research hotspot. Electrochromic material, as a kind of optoelectronic material, will change its color and transmittance when the voltage changes, and it is a kind of energy-saving material with better performance. As an emerging electrochromic material, polyoxometalate material has high chemical stability and UV stability. In terms of electrochromic performance, it avoids the poor optical performance, slow color conversion and poor radiation resistance of traditional electrochromic materials. and other shortcomings. Electrochromic energy storage devices, which have both charge storage and electrochromic pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1514G02F1/155G02F1/163
CPCG02F1/1514G02F1/155G02F1/163Y02E60/13
Inventor 王诗铭李东升李超陈姿蓉穆文雨
Owner LIAONING UNIVERSITY
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