Method of preparing composite metal oxide thin film using hydrotalcite analog as precursor

A technology of oxide film and composite metal, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of loose substrate bonding, uneven film surface, low practicability, etc., and achieve good adhesion, The particles are evenly dispersed to achieve the effect of wide application

Inactive Publication Date: 2007-02-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, there are inevitably defects such as uneven surface of the film, poor combination with the substrate, and low practicability.

Method used

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  • Method of preparing composite metal oxide thin film using hydrotalcite analog as precursor
  • Method of preparing composite metal oxide thin film using hydrotalcite analog as precursor
  • Method of preparing composite metal oxide thin film using hydrotalcite analog as precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Step A: Ultrasonic cleaning the high-purity aluminum sheet in absolute ethanol and deionized water for 3 minutes, then dissolving it in 0.1M NaOH solution for 2 minutes, then rinsing it with deionized water for 1 minute, and putting the washed aluminum sheet in In the electrolytic cell, the aluminum sheet is used as the cathode, the lead sheet is used as the anode, and the sulfuric acid solution with a concentration of 1mol / l is used as the electrolyte for constant voltage oxidation. The working voltage is 16V, the current is 1A, the electrolysis time is 1h, and the electrolysis temperature is room temperature. The oxidation area of ​​aluminum sheet is 10×7×2=126cm 2 . Take out the oxidized aluminum sheet, rinse off the residual acid solution on the surface with deionized water, dry it at 70°C for 12 hours, cut it into a size of 17mm×25mm, and tie thin wires on the two corners on the same side, Put in a desiccator for later use. From the X-ray diffraction pattern ( f...

Embodiment 2

[0038] Step A: the preparation method of anodized aluminum sheet is the same as that in Example 1

[0039] Step B: Weigh Co(NO 3 ) 2 ·6H 2 O 0.04362g, Ni(NO 3 ) 2 ·6H 2 O 0.1310g, urea 2.8829g, dissolved in 200ml deionized water, [Co 2+ ] / [Ni 2+ ]=1 / 3, [urea] / [M 1 2+ +M 2 2+ ] = 40. , the total ion concentration of divalent metals is 0.003mol / l, hang the AAO / Al substrate vertically in a glass reactor, and completely immerse the substrate in the reaction solution, use nitrogen protection, react in a water bath at 90°C for 6h, and then take it out The aluminum sheet was dried at 70° C. for 12 hours after rinsing off the reaction solution remaining on the surface with deionized water.

[0040] Step C: Place the dried hydrotalcite film precursor in a muffle furnace, raise the temperature from room temperature to 600°C at a heating rate of 5°C / min, and keep it at 600°C for 8 hours, and then cool down naturally by cooling with the furnace to room temperature. XRD and S...

Embodiment 3

[0042] Step A: the preparation method of anodized aluminum sheet is the same as that in Example 1

[0043] Step B: Weigh Ni(NO 3 ) 2 ·6H 2 O 1.3086g, Mg(NO 3 ) 2 ·6H 2 O 0.3846g, urea 2.8829g, dissolved in 200ml deionized water, [Mg 2+ ] / [Ni 2+ ]=1 / 3, [urea] / [M 1 2+ +M 2 2+ ]=4, the ion concentration of the total divalent metal is 0.03mol / l, the AAO / Al matrix is ​​vertically suspended in a glass reactor, the AAO / Al matrix is ​​completely immersed in the reaction solution, and reacted in an oven at 90°C for 48h, and then The aluminum sheet was taken out, and the reaction solution remaining on the surface was washed away with deionized water, and then dried at 70° C. for 12 hours.

[0044] Step C: Place the dried hydrotalcite film precursor in a muffle furnace, raise the temperature from room temperature to 600°C at a heating rate of 5°C / min, keep it at 600°C for 8 hours, and then cool down naturally to room temperature. A Ni / Mg / Al composite metal oxide film was obt...

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Abstract

the invention discloses a composite metal oxide film preparing method based on similar hydrotalcite as former, which is characterized by the following: adopting original synthetic technology to obtain the former of similar hydrotalcite on the AAO/Al; realizing the conversion from hydrotalcite film to composite metal oxide film with structural general formula as M12+zM22+1-x-zAl3+xO1+x/2.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite metal oxide films, and in particular provides a method for preparing composite metal oxide films using hydrotalcite-like precursors. Background technique [0002] Hydrotalcite-like compounds (HTLcs for short) are a kind of composite metal hydroxides (layered double hydroxides for short LDHs) with a layered structure. Because of its special properties in chemistry and structure, hydrotalcites can be directly used as catalysts and catalyst supports. However, more applications of hydrotalcites are as catalyst precursors, that is, they are calcined at a certain temperature to obtain composite metal oxides before application. Hydrotalcite-like composite metal oxides, with their special structures, such as high specific surface area, highly uniform dispersion of divalent and trivalent metals, more alkali centers on the surface, variety of types and excellent catalytic performance , an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/24
Inventor 段雪杨兰田媛媛张法智
Owner BEIJING UNIV OF CHEM TECH
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