CN102723122B - A kind of dye-sensitized solar cell photoanode slurry and preparation method thereof - Google Patents

Abstract

The invention relates to a dye-sensitized solar cell photoanode slurry and a preparation method thereof. The method uses a mixed system of pure anatase phase titanium dioxide powder, a certain amount of organic solvent and water to carry out high-power ultrasound, so that the A slurry that can be used for coating is obtained. The method of the invention is low in cost, simple in process, and good in repeatability; the prepared slurry is uniform in concentration, easy to control in coating film thickness, good in coating property, can avoid introducing impurities, and can realize dye-sensitized solar cells in a relatively short time Significant improvement in performance greatly saves time and cost; it can effectively improve the short-circuit current, open-circuit voltage and final photoelectric conversion efficiency of the dye-sensitized solar cell.

Description

A kind of dye-sensitized solar cell photoanode slurry and preparation method thereof

technical field

The invention relates to the research field of dye-sensitized solar cell photoanodes, in particular to a dye-sensitized solar cell photoanode slurry and a preparation method thereof.

Background technique

Dye-sensitized solar cells are a new generation of solar cells inspired by plant photosynthesis. Compared with traditional silicon solar cells, they have the following main advantages: wide source of raw materials, low production cost, simple process technology and environmental friendliness It is very suitable for large-scale industrial production. At present, the highest efficiency reported in the laboratory is about 12.3%, and there is still a certain distance from mass production. More and more researchers have begun to devote themselves to the research of dye-sensitized solar cells.

In order to improve the photoelectric conversion efficiency of dye-sensitized solar cells, many researchers focus on the development of new dyes and new electrolytes. progress, obtained dyes with better spectral response and electrolytes with improved transport properties, but due to the key problem of difficult matching of energy levels between dyes and electrolytes, the final battery performance has not been significantly improved, and the input and output are very high. out of tune. As an important part of dye-sensitized solar cells, the photoanode has also attracted much attention, and its research has always been a hot topic.

At present, the main research direction of researchers is to improve the overall performance of the battery by adjusting its morphology (nanosphere, nanoflower, nanowire, core-shell structure). However, the work required to prepare various anode nanoscale shapes is very delicate and the experimental conditions are very harsh, which is not suitable for rapid production. In addition, the current laboratory mainly prepares photoanodes by hydrothermal rotary distillation, hydrothermal terpineol system method, and ball milling P25 (a commercial titanium dioxide nanopowder) method. However, a common problem with the above methods is the production The cycle is long, and the concentration of the slurry obtained after rotary distillation is different, it is difficult to control the film thickness, and the slurry obtained by the ball milling method cannot avoid the introduction of impurities.

Contents of the invention

The present invention aims at the problems existing in the above-mentioned background technology, and provides a dye-sensitized solar cell photoanode slurry and a preparation method thereof.

The technical scheme that the present invention takes is:

(1) A dye-sensitized solar cell photoanode slurry, characterized in that the slurry components include pure anatase phase titanium dioxide powder, ethanol, acetylacetone, deionized water, emulsifier, and its components The ratio is pure anatase phase titanium dioxide powder/ethanol/acetylacetone/deionized water/emulsifier=(4～5)g/(20～30)ml/(0.8～1)ml/(5～6)ml/ (0.3～0.5)ml;

As a preferred option:

The emulsifier is Triton TX-100 or polyethylene glycol octyl phenyl ether or a mixture of Triton TX-100 and polyethylene glycol octyl phenyl ether.

A preparation method of dye-sensitized solar cell photoanode slurry, the steps are as follows:

1) According to pure anatase phase titanium dioxide powder/ethanol/acetylacetone/deionized water/emulsifier=(4～5)g/(20～30)ml/(0.8～1)ml/(5～6)ml /(0.3～0.5)ml respectively take titanium dioxide powder, ethanol, acetylacetone, deionized water, emulsifier, and set aside;

2) Preparation of mixed system

Add ethanol, acetylacetone, deionized water, and pure anatase phase titanium dioxide powder into the reagent bottle, and stir until fully mixed;

3) Preparation of slurry

Ultrasonic the mixed system, then add the emulsifier, and stir until fully mixed and uniform to obtain a slurry.

As a preferred option:

The emulsifier is Triton TX-100 or polyethylene glycol octyl phenyl ether or a mixture of Triton TX-100 and polyethylene glycol octyl phenyl ether.

The ultrasonic power is 800~1000 W, and the ultrasonic time is 15~90min.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The method of the present invention has low cost, simple process and good repeatability.

2. The slurry prepared by the method of the present invention is uniform in concentration, easy to control the thickness of the coating film, good in paintability, can avoid the introduction of impurities, and can achieve a significant improvement in the performance of the dye-sensitized solar cell in a relatively short time. Save time and cost;

3. The slurry prepared by the method of the present invention can effectively improve the short-circuit current, open-circuit voltage and final photoelectric conversion efficiency of the dye-sensitized solar cell.

Description of drawings

Fig. 1 is the I-V graph of the photoanode corresponding dye-sensitized solar cell prepared by embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, comparative example;

FIG. 2 is a physical comparison diagram of photoanodes prepared in Example 1 and Comparative Example.

Detailed ways

The present invention and its effects will be further described below in conjunction with specific examples, and the specific effects of the present invention will be further clarified according to comparative experiments. This specific embodiment does not limit its protection scope.

Embodiment one

1. Preparation of slurry

1) Add 20 mL of ethanol, 5 mL of deionized water, and 1 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 5 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 15 min under the condition of ultrasonic power of 1000 W, then add 0.5 mL of Triton TX-100, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) Apply the obtained slurry on the conductive glass by scraping method, and then sinter at 500 degrees Celsius for 30 minutes to obtain the photoanode;

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment two:

1. Preparation of slurry

1) Add 30 mL of ethanol, 5 mL of deionized water, and 1 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 5 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 30 min under the condition of ultrasonic power of 1000 W, then add 0.5 mL Triton TX-100, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment three

1. Preparation of slurry

1) Add 30 mL of ethanol, 5 mL of deionized water, and 0.8 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 5 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 30 min at an ultrasonic power of 800 W, then add 0.5 mL of polyethylene glycol octylphenyl ether, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment Four

1. Preparation of slurry

1) Add 30 mL of ethanol, 6 mL of deionized water, and 0.9 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 5 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 90 min under the condition of ultrasonic power of 900 W, then add 0.5 mL of Triton TX-100, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment five

1. Preparation of slurry

1) Add 30 mL of ethanol, 5 mL of deionized water, and 0.8 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 4 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 90 min under the condition of ultrasonic power of 1000 W, then add 0.3 mL Triton TX-100, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment six

1. Preparation of slurry

1) Add 30 mL of ethanol, 6 mL of deionized water, and 1 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 4 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Sonicate the mixed system prepared in the previous step for 90 min under the condition of ultrasonic power of 1000 W, then add 0.4 mL Triton TX-100 and polyethylene glycol octyl phenyl ether mixture, stir until fully mixed Uniformly, a slurry is obtained.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

Embodiment seven

1. Preparation of slurry

Step 1: Homemade pure anatase phase titanium dioxide powder

1) Mix 10ml of titanium isopropoxide and 2.1g of glacial acetic acid, add 50mL of deionized water into the conical flask, pour the mixture of titanium isopropoxide and glacial acetic acid into the conical flask, stir vigorously for 1 hour and then add 0.68 mL of concentrated nitric acid, heat at 80°C for 3 hours, then carry out suction filtration, transfer the filtrate into a hydrothermal kettle, keep at 220°C for 12 hours, and wait for the hydrothermal liquid to cool down to room temperature naturally;

2) Transfer the obtained hydrothermal solution to a centrifuge tube, add ethanol twice its volume, set the centrifugation speed at 5000 rpm, centrifuge for 10 min, and repeat three times. Move the precipitate obtained by centrifugation to an oven for 5 h at 80 degrees Celsius, and then grind to obtain pure anatase phase titanium dioxide powder;

3) Weigh the pure anatase phase titanium dioxide powder prepared in the previous step and set aside.

Step 2: Prepare slurry

1) Add 30 mL of ethanol, 5 mL of deionized water, and 1 mL of acetylacetone into a 60 mL wide-mouth reagent bottle, stir rapidly for 10 minutes, then add 5 g of pure anatase phase titanium dioxide powder into the above mixing system, and stir until Mix well;

2) Ultrasonicate the mixed system prepared in the previous step for 90 min under the condition of ultrasonic power of 1000 W, then add 0.5 mL Triton TX-100, and stir until fully mixed to obtain a slurry.

2. Effect test:

1) The obtained slurry was coated on the conductive glass by scraping method, and then sintered at 500 degrees Celsius for 30 minutes to obtain the photoanode.

2) The sintered photoanode was immersed in N719 dye-sensitized for 12 hours, then the electrolyte was dropped on the photoanode, and the platinum counter electrode was covered to assemble a dye-sensitized solar cell.

3) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

comparative example

1. Preparation of slurry

Step 1: Preparation of Titanium Dioxide Hydrothermal Solution

Mix 10ml of titanium isopropoxide and 2.1g of glacial acetic acid, add 50mL of deionized water to the conical flask, pour the mixture of titanium isopropoxide and glacial acetic acid into the conical flask, stir vigorously for 1 hour, then add 0.68 mL Concentrated nitric acid, at 80°C for 3 h. Then carry out suction filtration, move the filtrate into a hydrothermal kettle, keep warm at 220°C for 12 hours, and wait for the hydrothermal liquid to cool down to room temperature naturally.

Step 2: Prepare slurry

The room temperature hydrothermal solution was transferred to a distillation flask and rotated to a volume of about 25ml, then 0.56g polyethylene glycol and 0.5ml Triton X-100 were added, and stirred at room temperature for 12 hours to obtain a hydrothermal slurry.

2. Effect test:

1) Apply the obtained slurry on the conductive glass with a glass rod, dry it naturally, and then calcinate it in an annealing furnace at 500°C for 0.5 h to obtain a titanium dioxide photoanode, and immerse the sintered photoanode in N719 dye sensitization for 12 hours , and then drop the electrolyte on the photoanode, cover the platinum counter electrode and assemble it into a dye-sensitized solar cell;

2) Test the photoelectric energy conversion efficiency of the obtained dye-sensitized solar cells:

Test conditions: The standard 500W simulated sunlight xenon lamp of the Oriel 91192 model in the United States is used as the light source, the irradiance intensity is 80W/cm ² , and the illuminated area of the battery is 0. 25cm ² .

The measurement result of embodiment and comparative example is as table 1:

Table 1

It can be clearly seen from the table that the open-circuit voltage, short-circuit current and photoelectric conversion efficiency of the dye-sensitized solar cell can be obviously improved by adopting the method of the present invention.

Claims (5)

1. a dye-sensitized solar cell anode slurry, it is characterized in that including pure anatase phase titanium dioxide powder in the component of this slurry, ethanol, acetylacetone,2,4-pentanedione, deionized water, emulsifying agent, the ratio of its each component is pure anatase phase titanium dioxide powder/ethanol/acetylacetone,2,4-pentanedione/deionized water/emulsifying agent=(4～5) g/ (20～30) ml/ (0.8～1) ml/ (5～6) ml/ (0.3～0.5) ml.

2. a kind of dye-sensitized solar cell anode slurry as claimed in claim 1, is characterized in that described emulsifying agent is the mixture of Qu Latong TX-100 or Triton X-100 or triton x-100 and Triton X-100.

3. a preparation method for dye-sensitized solar cell anode slurry as claimed in claim 1, is characterized in that step is as follows:

1) according to pure anatase phase titanium dioxide powder/ethanol/acetylacetone,2,4-pentanedione/deionized water/emulsifying agent=(4～5) g/ (20～30) ml/ (0.8～1) ml/ (5～6) ml/ (0.3～0.5) ml, get respectively titania powder, ethanol, acetylacetone,2,4-pentanedione, deionized water, emulsifying agent, standby;

Prepare mixed system

In reagent bottle, add ethanol, acetylacetone,2,4-pentanedione, deionized water, pure anatase phase titanium dioxide powder, is stirred to fully and mixes;

3) prepare slurry

Mixed system is carried out ultrasonic, then add emulsifying agent, be stirred to fully and mix, obtain slurry.

4. the preparation method of a kind of dye-sensitized solar cell anode slurry as claimed in claim 3, is characterized in that described emulsifying agent is the mixture of Qu Latong TX-100 or Triton X-100 or triton x-100 and Triton X-100.

5. the preparation method of a kind of dye-sensitized solar cell anode slurry as claimed in claim 3, is characterized in that described ultrasonic power is 800 ~ 1000 W, and ultrasonic time is 15 ~ 90min.

Images