Preparation method of zinc indium sulfide and carbon nanotube composite material

Abstract

The invention discloses a preparation method of a zinc indium sulfide and carbon nanotube composite material, and belongs to the technical field of solar cell electrodes. The preparation method comprises the following steps: firstly, mixing a carbon nanotube and various materials in deionized water, adding concentrated hydrochloric acid, stirring, and carrying out ultrasonic dispersion treatment to obtain a mixed solution, carrying out hydrothermal reaction, carrying out centrifugal washing treatment on a product, carrying out freeze drying to obtain precursor powder, mixing and grinding the precursor powder and polyethylene glycol, roasting in an inert atmosphere, and cooling to obtain the carbon nanotube / polyethylene glycol composite material. The zinc indium sulfide and carbon nanotube composite powder is obtained. The composite material obtained by the preparation method is suitable for manufacturing a counter electrode of a dye-sensitized solar cell, has the technical effects of good photoelectric conversion efficiency, good mechanical flexibility and low cost, can break through the development problem of a traditional platinum electrode, and can promote the development of the dye-sensitized solar cell.

Description

Technical Field

[0001] This invention relates to the field of solar cell electrode technology, and more specifically to a method for preparing a composite material of zinc indium sulfide and carbon nanotubes. Background Technology

[0003] Currently, platinum is the primary material used for the counter electrode, which has become a stumbling block to the commercial application of dye-sensitized solar cells. The limited reserves of platinum resources result in high manufacturing costs for platinum electrodes, and their poor mechanical flexibility restricts the development of dye-sensitized solar cells in flexible electronics, building-integrated photovoltaics, and other fields. Existing alternative materials, however, produce counter electrodes with poor photoelectric conversion efficiency, failing to achieve the performance standards of platinum electrodes while controlling manufacturing costs. Summary of the Invention

[0004] The purpose of this invention is to provide a low-cost, flexible, and efficient counter electrode preparation material.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing a zinc indium sulfide-carbon nanotube composite material includes the following steps:

[0007] S1. Carbon nanotubes, zinc nitrate hexahydrate, indium trichloride, thioacetamide, and trisodium citrate are mixed in deionized water, then concentrated hydrochloric acid is added and stirred evenly. Finally, the mixture is obtained by ultrasonic treatment.

[0008] S2. The mixture obtained in step S1 is placed in a reaction vessel for hydrothermal reaction to obtain the reaction product;

[0009] S3. The reaction product obtained in step S2 is centrifuged and washed with water to obtain a solid precipitate. The solid precipitate is then freeze-dried to finally form a precursor solid powder.

[0010] S4. The precursor solid powder obtained in step S3 is mixed with polyethylene glycol and then ground. Subsequently, it is fully calcined under an inert atmosphere to ensure that the precursor solid powder and polyethylene glycol are fully mixed. After the calcined product is cooled to room temperature, ZnInS2@CNT powder is obtained, which is a composite material of zinc indium sulfide and carbon nanotubes.

[0011] Preferably, when adding concentrated hydrochloric acid and stirring in step S1, the pH value is adjusted to 1.

[0012] Preferably, the ultrasonic treatment in step S1 is ultrasonic dispersion, and the ultrasonic dispersion time is 30 minutes.

[0013] Preferably, the temperature of the hydrothermal reaction in step S2 is 120°C, and the time of the hydrothermal reaction is 12 hours.

[0014] Preferably, the centrifugal washing in step S3 requires two washes.

[0015] Preferably, the freeze-drying time in step S3 is 12 hours.

[0016] Preferably, the required raw material ratio in step S1 is: 1 mmol zinc nitrate hexahydrate, 2 mmol indium trichloride, 8 mmol thioacetamide, 300 mg trisodium citrate and carbon nanotubes.

[0017] Preferably, the composite material is ZnInS2@CNT powder, which can be used in the fabrication of electrode materials in dye-sensitized solar cells.

[0018] The beneficial effects of this invention are as follows:

[0019] The composite material of this invention achieves a photoelectric conversion efficiency exceeding that of a platinum counter electrode (18.8%), while reducing manufacturing costs by 10%, demonstrating excellent cost-effectiveness and flexibility. This material overcomes the development challenges of platinum counter electrodes in the commercialization of dye-sensitized solar cells, solves various application technology problems of traditional platinum electrodes, and can promote the development of dye-sensitized solar cells in more fields.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the preparation steps of the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 As shown, a method for preparing a zinc indium sulfide / carbon nanotube composite material includes the following steps:

[0027] S1. Carbon nanotubes, zinc nitrate hexahydrate, indium trichloride, thioacetamide, and trisodium citrate are mixed in deionized water, then concentrated hydrochloric acid is added and stirred evenly. Finally, the mixture is obtained by ultrasonic treatment.

[0028] S2. The mixture obtained in step S1 is placed in a reaction vessel for hydrothermal reaction to obtain the reaction product;

[0029] S3. The reaction product obtained in step S2 is centrifuged and washed with water to obtain a solid precipitate. The solid precipitate is then freeze-dried to finally form a precursor solid powder.

[0030] S4. The precursor solid powder obtained in step S3 is mixed with polyethylene glycol and then ground. Subsequently, it is fully calcined under an inert atmosphere to ensure that the precursor solid powder and polyethylene glycol are fully mixed. After the calcined product is cooled to room temperature, ZnInS2@CNT powder is obtained, which is a composite material of zinc indium sulfide and carbon nanotubes.

[0031] Specifically, when adding concentrated hydrochloric acid and stirring in step S1, the pH value is adjusted to 1.

[0032] Specifically, the ultrasonic treatment in step S1 is ultrasonic dispersion, and the ultrasonic dispersion time is 30 minutes.

[0033] Specifically, the hydrothermal reaction temperature in step S2 is 120°C, and the hydrothermal reaction time is 12 hours.

[0034] Specifically, in step S3, the centrifugal washing needs to be done twice.

[0035] Specifically, the freeze-drying time in step S3 is 12 hours.

[0036] Specifically, the required raw material ratio in step S1 is: 1 mmol zinc nitrate hexahydrate, 2 mmol indium trichloride, 8 mmol thioacetamide, 300 mg trisodium citrate, and carbon nanotubes.

[0037] Specifically, the zinc indium sulfide-carbon nanotube composite material is ZnInS2@CNT powder, which can be used in the fabrication of electrode materials in dye-sensitized solar cells.

[0038] Example

[0039] Carbon nanotubes, 1 mmol zinc nitrate hexahydrate, 2 mmol indium trichloride, 8 mmol thioacetamide, and 300 mg trisodium citrate were mixed into deionized water. Concentrated hydrochloric acid was added to the deionized water and the mixture was stirred continuously. The pH was adjusted to 1, and then ultrasonic dispersion was performed for 30 minutes to obtain the mixture.

[0040] The mixture was then transferred to a reaction vessel and subjected to a hydrothermal reaction at 120°C for 12 hours. After the reaction was completed, the reaction product was obtained. The product was subjected to two centrifugal washing treatments to obtain a solid precipitate. The solid precipitate was placed in a drying device for 12 hours of freeze drying to obtain the precursor solid powder.

[0041] The obtained precursor solid powder is thoroughly mixed with polyethylene glycol and then ground to ensure uniform mixing. The ground mixture is then placed in an inert atmosphere for complete calcination. After calcination, it is cooled to room temperature to obtain ZnInS2@CNT powder, which is a composite material of zinc indium sulfide and carbon nanotubes.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for preparing a composite material of zinc indium sulfide and carbon nanotubes, characterized in that, Includes the following steps: S1. Carbon nanotubes, zinc nitrate hexahydrate, indium trichloride, thioacetamide, and trisodium citrate are mixed in deionized water, then concentrated hydrochloric acid is added and stirred evenly. Finally, the mixture is obtained by ultrasonic treatment. S2. The mixture obtained in step S1 is placed in a reaction vessel for hydrothermal reaction to obtain the reaction product; S3. The reaction product obtained in step S2 is centrifuged and washed with water to obtain a solid precipitate. The solid precipitate is then freeze-dried to finally form a precursor solid powder. S4. The precursor solid powder obtained in step S3 is mixed with polyethylene glycol and then ground. Subsequently, it is fully calcined under an inert atmosphere to ensure that the precursor solid powder and polyethylene glycol are fully mixed. After the calcined product is cooled to room temperature, ZnInS2@CNT powder is obtained.

2. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, When adding concentrated hydrochloric acid and stirring in step S1, the pH value is adjusted to 1.

3. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, The ultrasonic treatment in step S1 is ultrasonic dispersion, and the ultrasonic dispersion time is 30 minutes.

4. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, The hydrothermal reaction temperature in step S2 is 120°C, and the hydrothermal reaction time is 12 hours.

5. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, In step S3, the centrifugal washing needs to be done twice.

6. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, The freeze-drying time in step S3 is 12 hours.

7. The method for preparing a zinc indium sulfide and carbon nanotube composite material according to claim 1, characterized in that, The required raw material ratio in step S1 is: 1 mmol zinc nitrate hexahydrate, 2 mmol indium trichloride, 8 mmol thioacetamide, 300 mg trisodium citrate and carbon nanotubes.

8. A zinc indium sulfide and carbon nanotube composite material obtained by the preparation method of a zinc indium sulfide and carbon nanotube composite material according to any one of claims 1-7, characterized in that, The composite material is ZnInS2@CNT powder, which can be used in the fabrication of electrode materials in dye-sensitized solar cells.

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