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Method for preparing three-dimensional spherical anatase type TiO2 photo-anode

An anatase type, photoanode technology, applied in the field of solar cell photoanode, can solve the problems of long preparation time, expensive, toxic, etc., and achieve the effects of obvious performance improvement, short operation time and simple operation

Inactive Publication Date: 2013-06-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many current methods for preparing three-dimensional hierarchical structures require harsh conditions, such as high temperature and pressure, long preparation time, and the use of expensive, toxic, and volatile organic solvents.

Method used

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  • Method for preparing three-dimensional spherical anatase type TiO2 photo-anode
  • Method for preparing three-dimensional spherical anatase type TiO2 photo-anode
  • Method for preparing three-dimensional spherical anatase type TiO2 photo-anode

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Preparation of three-dimensional anatase TiO by low temperature hydrothermal method 2 nanosphere

[0035] Prepare 30mL reaction aqueous solution, this solution contains 0.3M NaOH, 15wt%H 2 o 2 , and then wash a piece of titanium and place it in the above solution, and seal it in a hydrothermal kettle, react at 80°C for 1 hour, and cool at room temperature to obtain a light yellow precipitate, which is obtained by washing and filtering with deionized water and 0.1M hydrochloric acid solution respectively. Pale yellow precipitate, finally dried at 60°C and air calcined at 450°C for 2h, can get three-dimensional TiO with high surface area 2 nanospheres. Such as figure 1 As shown, the diameter of nanospheres before high-temperature calcination is about 500nm, and they are assembled by many extremely thin ribbon units, while figure 2 showed that after high-temperature calcination, these ribbon-like units break into smaller sheets, image 3 The TEM images also echoe...

Embodiment 2

[0043] Prepare 30mL reaction aqueous solution, this solution contains 0.3M NaOH, 15wt%H 2 o 2 , and then wash a piece of titanium and place it in the above two solutions, and seal it in a hydrothermal kettle, react at 60°C for 2 hours, cool at room temperature, a pale yellow precipitate can be obtained, wash and filter with deionized water and 0.1M hydrochloric acid solution respectively The obtained pale yellow precipitate was finally dried at 60°C for 2h. Such as Figure 17 , when the hydrothermal reaction temperature is lowered from 80 °C in Example 1 to 60 °C, three-dimensional TiO can also be obtained 2 Spherical structure, the difference is that the diameter of the sphere increases from about 500 nm at 80 °C to about 700 nm at 60 °C. It can be seen that under lower temperature conditions, the reaction rate of the system decreases, and larger spherical structures are easy to form.

Embodiment 3

[0045] Prepare 30mL reaction aqueous solution, this solution contains 0.3M NaOH, 15wt%H 2 o 2 , and then wash a piece of titanium and place it in the above two solutions, and seal it in a hydrothermal kettle, react at 100°C for 0.5h, cool at room temperature, and a pale yellow precipitate can be obtained, which is washed with deionized water and 0.1M hydrochloric acid solution respectively The resulting pale yellow precipitate was filtered and finally dried at 60 °C for 2 h. Such as Figure 18 , when the hydrothermal reaction temperature is increased from 80 °C in Example 1 to 100 °C, three-dimensional TiO can also be obtained 2 A spherical structure, except that the diameter of the spheres decreases from about 500 nm at 80°C to about 300 nm at 100°C. It can be seen that under higher temperature conditions, the reaction speed of the system is accelerated, and smaller spherical structures will be formed.

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Abstract

The invention discloses a method for preparing a three-dimensional spherical anatase type TiO2 photo-anode, relating to a solar cell photo-anode. The method comprises the steps of: preparing a reaction water solution, wherein the reaction water solution contains 0.1-1M sodium hydroxide and 5wt%-30wt% of hydrogen peroxide; then, cleaning a titanium sheet, placing the cleaned titanium sheet in the reaction water solution, sealing the reaction water solution in a hydrothermal kettle for reaction, and then cooling to obtain light yellow precipitates; then, washing and filtering the light yellow precipitates, drying and sintering the light yellow precipitates to obtain three-dimensional TiO2 nanospheres; and mixing and stirring the three-dimensional TiO2 nanospheres, polyethylene glycol, deonized water and absolute ethyl alcohol to prepare slurry, cleaning and drying FTO electrocondcutive glass, coating a slurry layer on the FTO electroconductive glass, sintering and then carrying out TiCl4 treatment to obtain the three-dimensional spherical anatase type TiO2 photo-anode. The method is simple to operate, short in operation time, low in cost, remarkable in improving the performance of a dye-sensitized solar cell, and easy for industrialization.

Description

technical field [0001] The invention relates to a solar cell photoanode, in particular to a three-dimensional spherical anatase TiO 2 Preparation method of photoanode. Background technique [0002] In 1991, the Swiss Federal Institute of Technology in Lausanne Professor et al. (B.O'Regan and M.Gratzel, Nature, 1991,353,737) reported for the first time based on mesoporous TiO 2 The dye-sensitized solar cell with nanoparticle film photoanode has a photoelectric conversion efficiency of more than 7%. This battery uses rhodium complexes as dye sensitizers to absorb light and generate excited electrons, while mesoporous TiO 2 The nanoparticle film acts as a photoanode to adsorb dye molecules and conduct the excited electrons to the external circuit to complete the photoelectric conversion process. Their pioneering work opens up new possibilities for preparing low-cost third-generation solar cells. At present, the highest efficiency of dye-sensitized solar cells has reached ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/042
CPCY02E10/542
Inventor 林昌健叶美丹吕妙强郑大江陈畅
Owner XIAMEN UNIV
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