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A kind of niobium pentoxide electrochromic film, hydrothermal synthesis method and use thereof

A niobium pentoxide and electrochromic technology, which is applied in coatings and other directions, can solve the problems of unsatisfactory light modulation amplitude and cycle stability, high preparation conditions, and short service life of color-changing devices. Chromogenic properties, low requirements for preparation conditions, high light modulation amplitude effect

Active Publication Date: 2022-08-09
南通晟利特节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently Nb 2 o 5 In terms of the preparation and performance of electrochromic thin films, the main problems are: (1) The preparation process is complicated: the magnetron sputtering method needs to be carried out under high vacuum conditions, which requires high preparation conditions; (2) The environment and safety Problem: The sol-gel method reported by some researchers is prone to produce toxic and harmful gases; (3) The light modulation amplitude and cycle stability are not ideal: the common Nb in the literature 2 o 5 The thin film is granular, the modulation amplitude of this structured light is not large enough, and the cycle stability is poor, resulting in a short service life of the electrochromic device

Method used

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  • A kind of niobium pentoxide electrochromic film, hydrothermal synthesis method and use thereof
  • A kind of niobium pentoxide electrochromic film, hydrothermal synthesis method and use thereof
  • A kind of niobium pentoxide electrochromic film, hydrothermal synthesis method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Cut the FTO conductive glass into 50mm × 25mm rectangular pieces, and then place them in acetone, ethanol and deionized water in sequence, and ultrasonically clean them for 5 to 10 minutes each. use.

[0036]Measure 18 mL of absolute ethanol and 42 mL of deionized water, and mix them evenly to obtain solution A. Weigh 3.2 g of commercially available niobium oxalate powder, add solution A, place in a 100 mL volume beaker, and stir with a magnetic stirrer at medium speed until colorless and transparent to obtain a niobium pentoxide precursor solution. Then move the solution to the lining of a 100mL capacity polytetrafluoroethylene high-pressure hydrothermal kettle, place a piece of pretreated FTO conductive glass conductive side down, and insert it into the solution at an angle of 75° to the horizontal line, the FTO conductive glass is beyond the liquid surface 10mm. After sealing the steel shell of the high-pressure hydrothermal kettle, it was put into an oven for hydr...

Embodiment 2

[0041] The pretreatment method of the FTO conductive glass is the same as that of Example 1.

[0042] Measure 24 mL of absolute ethanol and 36 mL of deionized water, and mix them evenly to obtain solution B. Weigh 3.2 g of niobium oxalate powder, add solution B, place in a 100 mL volume beaker, and stir with a magnetic stirrer at medium speed until colorless and transparent to obtain a niobium pentoxide precursor solution. Then move the solution to the lining of a 100mL capacity polytetrafluoroethylene high-pressure hydrothermal kettle, place a piece of pretreated FTO conductive glass conductive side down, and insert it into the solution at an angle of 75° with the horizontal line, the FTO conductive glass exceeds the liquid surface 10mm. After sealing the steel shell of the high-pressure hydrothermal kettle, it was put into an oven for hydrothermal reaction. The temperature of the oven was set to 160° C. and the reaction time was 3h. After the hydrothermal reaction was comp...

Embodiment 3

[0045] The specific embodiment and the test method are the same as in Example 1, except that the volume ratio of deionized water and ethanol is 4:1, that is, 12 mL of absolute ethanol and 48 mL of deionized water.

[0046] The electrochromic properties of the niobium pentoxide thin films prepared in Examples 1 to 3 are shown in Table 1:

[0047] Table 1 Data Summary of Examples 1 to 3

[0048]

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Abstract

The invention discloses a niobium pentoxide electrochromic film, a hydrothermal synthesis method and use thereof. In the present invention, the soluble niobium salt is firstly dissolved in a mixed solution of deionized water and ethanol to prepare a niobium pentoxide precursor solution, which is then transferred into a stainless steel hydrothermal kettle. Next, insert the clean FTO transparent conductive glass into the aforementioned niobium pentoxide precursor solution, seal the hydrothermal kettle and put it into an oven for hydrothermal reaction, and then grow niobium pentoxide on the conductive layer of the FTO conductive glass. film. The invention is simple to operate, easy to obtain raw materials, suitable for popularization and application, the prepared film exhibits obvious electrochromic effect, and can be used in the fields of smart windows, anti-glare rearview mirrors, building energy-saving smart windows and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of photoelectric functional films, in particular to a niobium pentoxide electrochromic film, a hydrothermal synthesis method and uses thereof. Background technique [0002] Electrochromism refers to the phenomenon in which the optical properties (reflectivity, transmittance, absorption rate, etc.) of materials produce stable and reversible changes under the action of an external electric field, and in terms of appearance performance, it is manifested as reversible changes in color and transparency. . Electrochromic materials are considered to be one of the most promising smart materials. [0003] In recent years, Nb 2 O 5 The electrochromic properties of thin films have been paid attention to by researchers. Romero R prepared Nb by spray pyrolysis. 2 O 5 Thin film, its coloring efficiency (660nm) can reach 25.5cm 2 / C. Miki T prepared Nb by magnetron sputtering 2 O 5 Electrochromic th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34
CPCC03C17/3417C03C2217/241C03C2217/218C03C2218/111C03C2218/31
Inventor 祝向荣禹超王金敏马董云汪哲一朱路平
Owner 南通晟利特节能环保科技有限公司
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