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Method for preparing stable sol of composite oxides of vanadium and tungsten

A composite oxide and sol technology, which is applied in the direction of vanadium compounds, tungsten compounds, chemical instruments and methods, etc., can solve the problems of high price and cost, difficult coating, unstable sol, etc., and achieve good reproducibility and simple preparation method Effect

Inactive Publication Date: 2009-06-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis of vanadium oxide sol mainly uses metal organic compounds of vanadium as raw materials, resulting in high price and cost
On the other hand, since WO 3 The sol itself is unstable, and with V 2 o 5 The crystal structure is different, and it is difficult to obtain a uniform and stable sol after doping, which causes great difficulties for the subsequent coating

Method used

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  • Method for preparing stable sol of composite oxides of vanadium and tungsten
  • Method for preparing stable sol of composite oxides of vanadium and tungsten
  • Method for preparing stable sol of composite oxides of vanadium and tungsten

Examples

Experimental program
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Effect test

Embodiment 1

[0024] V 2 o 5 -WO 3 The preparation of the composite precursor stable sol, the preparation steps are:

[0025] (1)V 2 o 5 The sol was prepared by melting and quenching method, that is, V 2 o 5 After the powder was melted at 800°C, it was quickly poured into deionized water and stirred to obtain a deep red sol; WO 3 The sol was prepared by the ion exchange method, using sodium tungstate solution as the precursor, through H 2 SO 4 In the treated ion exchange column, a light yellow sol was obtained;

[0026] (2) Mass ratio V 2 o 5 :WO 3 =1:0.2 ratio, the WO prepared in step (1) 3 Sol and V 2 o 5 Sol mixing, magnetic stirring in deionized water medium for 30 minutes;

[0027] (3) Move the mixed sol in step (2) into a stainless steel reaction kettle with a polytetrafluoroethylene substrate, and conduct a hydrothermal reaction at 180°C for 24 hours to obtain a uniform and stable V 2 o 5 -WO 3 Composite precursor sol;

[0028] Analytical testing shows (see accompa...

Embodiment 2～5

[0030] Example number Proportion Example 2 1 molar ratio V 2 o 5 +0.10 molar ratio WO 3

[0031] Example 3 1 molar ratio V 2 o 5 +012 molar ratio WO 3 Example 4 1 molar ratio V 2 o 5 +0.24 molar ratio WO 3 Example 5 1 molar ratio V 2 o 5 +0.30 molar ratio WO 3

[0032] According to the above experimental parameters with reference to the method of Example 1, the corresponding uniform and stable V 2 o 5 -WO 3 Composite precursor sol.

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Abstract

This invention relates to a method for preparing stable sol of V2O5-WO3 composite precursor. The method comprises: melting and quenching to obtain V2O5 sol, adding WO3 sol prepared by ion exchange, and performing hydrothermal reaction in a stainless steel reaction kettle with PTFE lining at 180 plus and minus 2 deg.C for 24 plus and minus 0.5 h to obtain uniform and stable mixed sol, and electrochromic thin film. The thin film has high capacitance and wide light-modulation range.

Description

technical field [0001] The invention relates to a method for synthesizing V by combining a sol-gel method and a hydrothermal method. 2 o 5 -WO 3 The invention discloses a method for stabilizing sol with a composite precursor, which belongs to the fields of inorganic non-metallic materials, nanometer materials and nanotechnology. Background technique [0002] Electrochromic materials and all-solid-state electrochromic devices based on them have important research value and development prospects, and the performance of electrochromic materials is one of the keys to the successful preparation of practical electrochromic devices. Inorganic electrochromic material V 2 o 5 As a color-changing layer of an electrochromic device, it has the advantages of a layered structure that is conducive to ion migration, good cycle reversibility, and multiple colors, but its light modulation range is narrow, the diffusion coefficient of lithium ions is small, and the response speed is slow. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00C01G31/00
Inventor 陈文朱泉峣杨莹周静靳艾平维克多·沃尔科夫佳丽娜·扎哈若娃
Owner WUHAN UNIV OF TECH
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