Graphene composite porous counter electrode, preparation method and application thereof

A graphene composite and graphene technology, applied in circuits, capacitors, photosensitive equipment, etc., can solve the problems of expensive raw materials, lower surface energy, and insufficient pores, and achieve simple and effective preparation methods, reduce current loss, and reduce energy loss Effect

Active Publication Date: 2012-02-08
中国科学院上海硅酸盐研究所苏州研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used counter electrode material is mainly metal platinum, which counters the I in the electrolyte. 3 - The reduction reaction has high catalytic performance, but it also has the following outstanding disadvantages: ①The price of raw materials is very expensive; ②It needs to be prepared by high-temperature sputtering method, so it cannot meet the requirements of large-scale roll-to-roll production of flexible batteries; ③Easy with I 3 - corroded by reaction
Graphene is a two-dimensional planar structure. Graphene sheets will spontaneously exist in an electrode in a flat, stacked configuration to minimize surface energy, and this stacked structure will address the following three aspects: Negative impact on electrode performance: the stacking and agglomeration of graphene sheets will significantly reduce the effective catalytic area; the lack of pores in the stacking structure lacks effective electrolyte transport and

Method used

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  • Graphene composite porous counter electrode, preparation method and application thereof
  • Graphene composite porous counter electrode, preparation method and application thereof
  • Graphene composite porous counter electrode, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add 1g graphite to 100mL concentrated sulfuric acid, add 4.5g KMnO 4 and 0.6g NaNO3 , mix well, react at room temperature for 5 days, add deionized water, after reacting for 2 hours, add H 2 o 2 , reducing unreacted potassium permanganate, the resulting brown product, washed with HCl, washed with water, and dried to obtain graphene oxide; dissolve 0.1g of the above graphene oxide in 100mL of water, add 0.5g of triton, ultrasonic 30min , add 0.2mL hydrazine hydrate dropwise, react at 100°C for 24h, wash with deionized water, and obtain graphene, figure 2 Its TEM photo; 0.1g of the above graphene powder and 0.025g of SnO 2 Mix the nano-powders, add 2mL ethanol and 0.05g ethyl cellulose, and ball mill for 16h. 2 Heat treatment at 450 °C for 3 h in a mixed gas to prepare a graphene / titanium oxide composite counter electrode. The photoelectric conversion efficiency of the dye-sensitized solar cell prepared by using the graphene / titanium oxide composite counter electrode...

Embodiment 2

[0035] Add 1g graphite to 100mL concentrated sulfuric acid, add 4.5g KMnO 4 and 0.6g NaNO 3 , mix well, react at room temperature for 5 days, add deionized water, after reacting for 2 hours, add H 2 o 2 , reducing unreacted potassium permanganate, the resulting brown product, washed with HCl, washed with water, and dried to obtain graphene oxide; dissolve 0.1g of the above graphene oxide in 100mL of water, add 0.5g of triton, ultrasonic 30min , add 0.2mL of hydrazine hydrate dropwise, react at 100°C for 24h, wash with deionized water to obtain graphene; mix 0.1g of the above graphene powder with 0.025g of P25 nanopowder, add 2mL of terpineol and 0.05g of ethyl cellulose, After ball milling for 16 hours, the resulting composite slurry was coated on the conductive glass by scraping, and the Ar / H 2 Heat treatment at 500 °C for 2 h in a mixed gas to prepare a graphene / titanium oxide composite counter electrode. The photoelectric conversion efficiency of the dye-sensitized sola...

Embodiment 3

[0037] Add 1g graphite to 100mL concentrated sulfuric acid, add 4.5g KMnO 4 and 0.6g NaNO 3 , mix well, react at room temperature for 5 days, add deionized water, after reacting for 2 hours, add H 2 o 2 , reducing unreacted potassium permanganate, the resulting brown product, washed with HCl, washed with water, and dried to obtain graphene oxide; dissolve 0.1g of the above graphene oxide in 100mL of water, add 0.5g of triton, ultrasonic 30min , add 0.2mL hydrazine hydrate dropwise, react at 100°C for 24h, wash with deionized water to obtain graphene; mix 0.1g of the above graphene powder with 0.025g of P25 titanium oxide nanopowder, add 2mL of terpineol and 0.05g of ethyl cellulose element, ball milled for 16h, and the resulting composite slurry was coated on a stainless steel sheet by scraping or screen printing. 2 Heat treatment at 500°C for 2h in mixed gas. image 3 It is the SEM photo of the graphene / titanium oxide composite counter electrode prepared above. It can be...

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Abstract

The invention discloses a graphene composite porous counter electrode, a preparation method and application thereof. The composite porous counter electrode is a mixture of grapheme and inorganic nanometer particles coated on a conductive substrate. The preparation method concretely comprises the following steps of: mixing the grapheme prepared through chemical reduction with the inorganic nanometer particles; adding a small amount of organic binder; coating the organic binder on a substrate material, such as metal, conductive glass or conductive plastic and the like; and obtaining the graphene composite porous counter electrode through thermal treatment. The porosity of the composite counter electrode ensures that the composite counter electrode and a liquid electrolyte have larger effective contact area; and the composite counter electrode has the photoelectric conversion efficiency equivalent to a magnetron sputtering Pt electrode when being applied to a dye sensitized solar cell. The composite electrode has the advantages of low cost, favorable stability and mechanical property and the like and has important significant on the wide application of the dye sensitized solar cell.

Description

technical field [0001] The invention designs a graphene composite porous counter electrode, a preparation method and an application thereof, and belongs to the technical field of dye-sensitized solar cell energy. Background technique [0002] While society is developing at a high speed, human beings are facing unprecedented energy crisis and environmental pollution. The use of renewable energy has become the only way for human sustainable development. As a non-polluting and clean energy device, solar cells are highly valued by governments all over the world. At present, silicon-based solar cells are mainly used widely, but their prices are very expensive. Dye-sensitized solar cells have the advantages of low cost, high stability, environmental friendliness, and can be fabricated into flexible cells. They are the most promising new solar cells to replace traditional silicon-based photovoltaic cells. Dye-sensitized solar cells are mainly composed of transparent conductive f...

Claims

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Application Information

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IPC IPC(8): H01G9/042H01G9/20H01M14/00H01L51/44H01L51/48H01L51/42
CPCY02E10/542Y02E10/549Y02P70/50
Inventor 刘阳桥孙静高濂孙盛睿罗建强杨帆
Owner 中国科学院上海硅酸盐研究所苏州研究院
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