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Method for preparing aluminum-doped nickel oxide electrochromic film by virtue of hydrotalcite precursor pyrolysis

An electrochromic and aluminum oxidation technology, which is applied in the field of preparing aluminum-doped nickel oxide electrochromic films by pyrolysis of hydrotalcite precursors, can solve the problems of poor cycle stability and slow electrochromic speed, and achieves fast transformation speed, good Effects of Cyclic Stability

Active Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiO thin film has abundant sources of raw materials, low price, simple preparation process, large optical modulation range, and is the most studied anode electrochromic material, but its commercial application is limited due to its slow electrochromic speed and poor cycle stability.

Method used

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  • Method for preparing aluminum-doped nickel oxide electrochromic film by virtue of hydrotalcite precursor pyrolysis
  • Method for preparing aluminum-doped nickel oxide electrochromic film by virtue of hydrotalcite precursor pyrolysis
  • Method for preparing aluminum-doped nickel oxide electrochromic film by virtue of hydrotalcite precursor pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Prepare hydrotalcite by co-precipitation method, the specific method is to weigh 11.632g Ni(NO 3 ) 2 ·6H 2 O and 5gAl(NO 3 ) 3 9H 2 O was dissolved in deionized water to make 100mL mixed salt solution, and 4.68g NaOH and 3.77g NaOH were weighed 2 CO 3 Dissolve in deionized water to make 100mL alkali solution, drop the two mixed solutions into a three-necked flask filled with 120ml deionized water at the same time and with mechanical stirring, in a water bath at 40°C, adjust the reaction to a final pH of 10, and crystallize for 24 hours. Centrifugal washing, drying, and grinding into powder, the chemical formula of the obtained nickel aluminum hydrotalcite is: Ni 0.753 Al 0.247 (OH) 2 (CO 3 ) 0.124 ·H 2 O;

[0023] 2. Weigh 10 mg of the nickel-aluminum hydrotalcite powder prepared in step 1 and disperse it in 10 ml of ethanol, and ultrasonicate for 20 minutes to obtain a colloidal solution; select a 2 cm*3 cm ITO sheet, and soak it in dilute hydrochloric a...

Embodiment 2

[0029] 1. Prepare hydrotalcite by co-precipitation method, the specific method is to weigh 11.632g Ni(NO 3 ) 2 ·6H 2 O and 3.75gAl(NO 3 ) 3 9H 2 O was dissolved in deionized water to make 100mL mixed salt solution, and 4.4g NaOH and 3.551g NaOH were weighed 2 CO 3 Dissolve in deionized water to make 100mL alkali solution, drop the two mixed solutions into a three-necked flask filled with 120ml deionized water at the same time and with mechanical stirring, in a 40°C water bath, adjust the reaction to a final pH of 10, centrifuge, wash, and dry , ground into powder, the chemical formula of the obtained nickel aluminum hydrotalcite is: Ni 0.831 Al 0.169 (OH) 2 (CO 3 ) 0.085 0.8H 2 O;

[0030] 2. With embodiment 1;

[0031] 3. With embodiment 1;

[0032] 4. With embodiment 1;

[0033] 5. Same as embodiment 1.

[0034] To characterize the product: by figure 1 The characteristic peaks such as 003, 006, and 012 in b can be known as the XRD pattern of nickel aluminum ...

Embodiment 3

[0036] 1. Prepare hydrotalcite by co-precipitation method, the specific method is to weigh 11.632g Ni(NO 3 ) 2 ·6H 2 O and 1.67gAl(NO 3 ) 3 9H 2 O was dissolved in deionized water to make 100mL mixed salt solution, and 3.91g NaOH and 3.16g NaOH were weighed 2 CO 3 Dissolve in deionized water to make 100mL alkali solution, drop the two mixed solutions into a three-necked flask filled with 120ml deionized water at the same time and with mechanical stirring, in a 40°C water bath, adjust the reaction to a final pH of 10, centrifuge, wash, and dry , ground into powder, the chemical formula of the obtained nickel aluminum hydrotalcite is: Ni 0.895 al 0.105 (OH) 2 (CO 3 ) 0.052 2H 2 O;

[0037] 2. With embodiment 1;

[0038] 3. With embodiment 1;

[0039] 4. With embodiment 1;

[0040] 5. Same as embodiment 1.

[0041] To characterize the product: by figure 1 The characteristic peaks such as 003, 006, and 012 in c can be known as the XRD pattern of nickel aluminum ca...

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Abstract

The invention discloses a method for preparing an aluminum-doped nickel oxide electrochromic film by virtue of hydrotalcite precursor pyrolysis. The method comprises the following steps: firstly, synthesizing Ni-Al LDHs differing in cationic proportion by virtue of a conventional coprecipitation method, dispersing the Ni-Al LDHs in ethanol so as to obtain a colloidal solution, spin-coating the colloidal solution by virtue of a film coating machine and pyrolyzing in a muffle furnace so as to obtain the aluminum-doped nickel oxide electrochromic film. The electrochromic film prepared by the method disclosed by the invention is a novel uniform aluminum-doped nickel oxide electrochromic film. The film is wide in optical modulating range (58%), high in transformation rate (bleaching time is 1.8s and coloring time is 4.2s) and good in cycling stability (15% of electrochromic performance is reduced by cycling for 200 times). The film can be also used for changing the performance of the aluminum-doped nickel oxide electrochromic film by regulating and controlling the cationic proportion.

Description

technical field [0001] The invention belongs to the technical field of electrochromic thin film preparation, and in particular relates to a method for preparing an aluminum-doped nickel oxide electrochromic thin film by pyrolyzing a hydrotalcite precursor. Background technique [0002] Electrochromic materials refer to substances that can undergo permanent and reversible changes in color under a certain voltage. Due to the special properties and good application prospects of this type of materials, people have paid great attention to them. Electrochromic materials can be divided into four categories: inorganic, organic, inorganic / organic composites, and inorganic / inorganic composites. The electrochromic material NiO involved in the present invention belongs to the category of inorganic, and there are many methods for preparing NiO electrochromic thin films, for example, magnetron sputtering, chemical vapor deposition, electrodeposition, spray pyrolysis, pulse Laser depositi...

Claims

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Application Information

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IPC IPC(8): C03C17/22
Inventor 陆军赖林聪李海龙高原纯雪罗镭
Owner BEIJING UNIV OF CHEM TECH
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