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Graphene counter electrode for dye-sensitized solar cell and manufacturing method of graphene counter electrode

A technology for solar cells and dye sensitization, applied in the field of solar cells, can solve problems such as hindering the application of dye-sensitized solar cells, restricting the development of dye-sensitizing solar cells, and destroying the conductivity of ITO conductive films, and achieves the benefits of electrolyte reduction, Easy to use flexible electrodes, low cost effect

Inactive Publication Date: 2012-07-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this counter electrode structure has the following Achilles heel: on the one hand, although metal platinum counter electrode has excellent catalytic performance, metal platinum is extremely expensive; on the other hand, the conductive layer of the existing conductive glass is mainly indium-doped Tin oxide (ITO) material, and indium as a strategic resource, is very scarce; moreover, the flexibility of ITO conductive glass is very small, usually when the stress reaches 4%, the conductivity of ITO conductive film will be severely damaged
All these factors greatly limit the development of counter electrodes for DMSCs, thereby hindering the application of DMSCs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, adopt the Graphene prepared by chemical liquid phase reduction method as the graphene counter electrode of graphene catalytic layer, its concrete steps are as follows:

[0019] Graphene is prepared on the metal by chemical vapor deposition, and the graphene is transferred to the glass substrate by the existing transfer technology, and the transfer is repeated twice, so that the glass substrate has three layers of graphene as the graphene conductive layer. Mix and grind the graphene powder prepared by the chemical liquid phase reduction method with hydroxyethyl cellulose, add a small amount of ethanol dropwise, and continue grinding to form a slurry. Wherein the mass mixing ratio between graphene powder, hydroxyethyl cellulose and ethanol is: 30mg: 3mg: 2ml. The slurry was coated on the graphene conductive layer by coating, and then placed in an air environment at 180° C. for 1 hour to obtain the final graphene counter electrode.

[0020] The test found th...

Embodiment 2

[0021] Embodiment 2, adopt nitrogen-doped graphene as the graphene counter electrode of graphene catalytic layer, its concrete steps are as follows:

[0022] Graphene is prepared on the metal by chemical vapor deposition, the graphene is transferred to the glass substrate through the existing transfer technology, and the transfer is repeated once, so that the glass substrate has two layers of graphene as the graphene conductive layer. The graphene powder prepared by the chemical liquid phase reduction method was dispersed in ammonia water, and then treated in a hydrothermal environment at 100°C for 10 hours to obtain nitrogen-doped graphene powder. Mix and grind nitrogen-doped graphene powder and hydroxyethyl cellulose, add a small amount of ethanol dropwise, and continue grinding to form a slurry. Wherein the mass mixing ratio between nitrogen-doped graphene powder, hydroxyethyl cellulose and ethanol is: 30mg: 3mg: 2ml. The slurry was coated on the graphene conductive layer ...

Embodiment 3

[0024] Embodiment 3, adopt boron-doped graphene as the graphene counter electrode of graphene catalytic layer, its concrete steps are as follows:

[0025] Graphene is prepared on the metal by chemical vapor deposition, the graphene film is transferred to the plastic substrate through the existing transfer technology, and the transfer is repeated once, so that the plastic substrate has two layers of graphene as the graphene conductive layer. The graphene powder prepared by the chemical liquid phase reduction method was placed in a quartz boat, passed through diborane at 200 Pa, and kept at 500° C. for 5 hours to obtain boron-doped graphene powder. The boron-doped graphene powder and hydroxyethyl cellulose are mixed and ground, a small amount of ethanol is added dropwise, and the grinding is continued to form a slurry. The mass mixing ratio of boron-doped graphene powder, hydroxyethyl cellulose and ethanol is: 30mg: 3mg: 2ml. The slurry was coated on the graphene conductive lay...

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Abstract

The invention relates to a graphene counter electrode for a dye-sensitized solar cell, belonging to the technical field of solar cells. The graphene counter electrode comprises a transparent substrate, a graphene conducting layer and a graphene catalyst layer, wherein the graphene conducting layer is arranged on the surface of the transparent substrate, the graphene catalyst layer is arranged on the surface of the graphene conducting layer; the graphene catalyst layer is manufactured by coating slurry formed by mixing graphene (or graphene-doped) powder, hydroxyethylcellulose and a volatile organic solvent on the graphene conducting layer, and drying a mixture. According to the graphene counter electrode disclosed by the invention, graphene is taken as a conducting layer to replace a traditional conducting thin film, such as ITO (Indium Tin Oxide); graphene powder with very large specific surface area as a catalyst layer takes the place of traditional metal platinum particles and has better catalysis effect. The graphene counter electrode disclosed by the invention has the characteristics of large area, low cost and high efficiency, the manufacturing process of the graphene counter electrod is simple, and a flexible electrode is conveniently obtained, thus the invention is hopeful to prompt the application of the graphene in the solar field, in particular the aspect of flexible dye-sensitized solar cells.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a dye-sensitized solar cell, in particular to a counter electrode structure of a dye-sensitized solar cell and a preparation method thereof. Background technique [0002] Energy issues have always been hot issues affecting human survival and development. Solar energy is a clean, efficient and inexhaustible new energy that can provide a stable energy supply to human beings. As one of the third-generation solar cells, dye-sensitized solar cells are expected to be put into practical application due to their low cost and simple preparation. The structure of dye-sensitized solar cells consists of three parts: photoanode, electrolyte and counter electrode. Its working principle is as follows: (1) Dye molecules transition from ground state to excited state after being irradiated by sunlight; (2) Dye molecules in excited state Inject electrons into the conduction band of the photoano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/20H01M14/00H01L51/44H01L51/48
CPCY02E10/542Y02E10/549Y02P70/50
Inventor 陈远富王泽高李萍剑陈鹏张万里李言荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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