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Method for preparing composite-grain diameter nano titanium dioxide powder

A nano-titanium dioxide and powder technology, applied in the direction of titanium dioxide, nanostructure manufacturing, titanium oxide/hydroxide, etc., can solve the problems of single precursor, single particle morphology and size, poor combined electron transport performance, etc., and achieve high performance. The effect of specific surface area and simple preparation process

Inactive Publication Date: 2010-11-24
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these technologies have a single reaction precursor, single particle shape and size, poor inter-particle bonding, and general electron transport performance, which affects their photocatalytic and photoelectric performance.

Method used

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  • Method for preparing composite-grain diameter nano titanium dioxide powder
  • Method for preparing composite-grain diameter nano titanium dioxide powder
  • Method for preparing composite-grain diameter nano titanium dioxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Use 0.3mol of titanium sulfate as a precursor, add 0.6mol of urea as a precipitant, add 300ml of deionized water, and use mechanical stirring to dissolve them to obtain A, use 0.3mol of titanyl sulfate as a precursor, add 0.8mol of urea is used as precipitant, add 300ml of deionized water, dissolve them with mechanical stirring to obtain B, then mix A and B to obtain a reaction solution, and then keep it in a high-pressure reactor at 200°C for 24h, and finally use distilled water and Washing with absolute ethanol twice and then drying to obtain nano-titanium dioxide powder with composite particle size.

Embodiment 2

[0009] Embodiment 2: use 0.3mol of titanium sulfate as a precursor, add 1.2mol of urea as a precipitant, add 300ml of deionized water, and use mechanical stirring to dissolve them to obtain A, use 0.3mol of titanyl sulfate as a precursor, add 1.8mol of urea was used as a precipitant, adding 300ml of deionized water, using mechanical stirring to dissolve them to obtain B, then mixing A and B to obtain a reaction solution, and then keeping it in a high-pressure reactor at 200°C for 24h, and finally using distilled water and Washing with absolute ethanol twice and then drying to obtain nano-titanium dioxide powder with composite particle size.

Embodiment 3

[0010] Embodiment 3: with 0.3mol of titanyl sulfate as precursor, add 0.6mol of ammonia as a precipitant, add 300ml of deionized water, add 0.4mol of nitric acid with a concentration of 1mol / L under mechanical stirring to dissolve them to obtain A , using 0.3mol of titanium sulfate as a precursor, adding 1.8mol of KOH as a precipitant, adding 300ml of deionized water, and then adding 0.6mol of nitric acid with a concentration of 1mol / L, mechanically stirring to dissolve them to obtain B, and then A Mix with B to obtain a reaction solution, then keep it in a high-pressure reactor at 100°C for 48 hours, and finally wash it twice with distilled water and absolute ethanol, and then dry it to obtain nano-titanium dioxide powder with a composite particle size.

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Abstract

The invention discloses a method for preparing composite-grain diameter nano titanium dioxide powder, comprising the following steps: mixing one titanium source from titanyl sulphate, titanic sulfate or titanium tetrachloride, one of urea, NaOH, KOH or ammonia water and one from HNO3, HCl or citric acid according to the molar ratio of 1:(2-6):(0-0.6), and dissolving the mixture into deionized water to obtain a mixed emulsion A; adding one of the other two titanium sources, one of urea, NaOH, KOH or ammonia water and one from HNO3, HCl or citric acid according to the molar ratio of 1:(2-6):(0-0.6), and dissolving the mixture into deionized water to obtain a mixed emulsion B; placing a mixture of the emulsion A and the emulsion B in an autoclave for hydrothermal synthesis reaction; and washing with water and alcohol successively to obtain anatase-type nano titanium dioxide powder with different grain diameters and appearances. By using the method, nano-level uniform mixing of different-grain diameter grains is realized in the presoma stage to secure preparation of high-performance solar cell in later period.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide powder used in dye-sensitized solar cells and photocatalysis-related fields, and belongs to the fields of new material technology and new energy technology. Background technique [0002] As an important semiconductor material, titanium dioxide is widely used in dye-sensitized solar cells and photocatalysis-related fields. To improve the photoelectric performance of titanium dioxide thin films, the two most important aspects are to inhibit the recombination of electron / hole pairs and improve collection and conduction. Electronic efficiency. One of the main ways to solve these two problems is to use titanium dioxide powders with different particle sizes and shapes to improve the combination between particles [Kuang, D.; Wang, P.; Ito, S.; Zakeeruddin, S.M.; Gratzel , M.J.Am.Chem.Soc., 2006, 128:7732-7745]. A great deal of research has been done on the preparation of nano-TiO photoanodes....

Claims

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Application Information

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IPC IPC(8): C01G23/053B82B3/00
Inventor 刘文秀姜春华王立新
Owner IRICO
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