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graphite phase c 3 no 4 Preparation method of carbon nanotube composite counter electrode

A carbon nanotube composite, C3N4 technology, applied in the field of solar cells, can solve the problems of low electrical conductivity, low photoelectric conversion efficiency of dye-sensitized solar cells, and reduced electron transport rate, etc. the transfer and the effect of improving the catalytic surface area

Inactive Publication Date: 2018-02-23
BOHAI UNIV
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  • Description
  • Claims
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Problems solved by technology

But due to the graphite phase C 3 N 4 The conductivity itself is low, so pure graphite phase C is used 3 N 4 As the counter electrode of dye-sensitized solar cells, the transport rate of electrons is reduced, resulting in low photoelectric conversion efficiency of the prepared dye-sensitized solar cells

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  • graphite phase c <sub>3</sub> no <sub>4</sub> Preparation method of carbon nanotube composite counter electrode
  • graphite phase c <sub>3</sub> no <sub>4</sub> Preparation method of carbon nanotube composite counter electrode
  • graphite phase c <sub>3</sub> no <sub>4</sub> Preparation method of carbon nanotube composite counter electrode

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[0028] A kind of graphite phase C that the present invention relates to 3 N 4 / The preparation method of carbon nanotube composite counter electrode, comprises steps as follows:

[0029] (1) Add carbon nanotubes into cyanamide or dicyandiamide solution, heat and reflux for 1 to 6 hours, preferably at a heating temperature of 90 to 100°C, then filter and dry under vacuum to obtain cyanide adsorbed on the surface Carbon nanotubes of amine or dicyandiamide; the concentration of the cyandiamide or dicyandiamide solution is 20-50wt%, and the weight of cyandiamide or dicyandiamide in the carbon nanotubes and cyandiamide or dicyandiamide solution The ratio is 1:10~1:30.

[0030] (2) Put the carbon nanotubes prepared in step (1) into a tubular furnace, control the heating rate to 2-6°C / min, heat up to 500-600°C, and heat-treat for 2-6 hours in a nitrogen atmosphere; cool to room temperature, the graphitic phase C 3 N 4 / carbon nanotube composites.

[0031] (3) The composite mat...

Embodiment 1

[0036] A kind of graphite phase C that the present invention relates to 3 N 4 / The preparation method of carbon nanotube composite counter electrode, comprises steps as follows:

[0037] (1) Add 200mg of carbon nanotubes into 12mL, 50wt% cyanamide solution, heat and reflux at 100°C for 1 hour, then filter, and dry at 60°C under vacuum to obtain carbon nanotubes with cyanamide adsorbed on the surface .

[0038] (2) Put the carbon nanotubes prepared in step (1) into a tube furnace, control the heating rate to 2° C. / min, raise the temperature to 500° C., and perform heat treatment in a nitrogen atmosphere for 6 hours; cool to room temperature to obtain a graphite phase C 3 N 4 / carbon nanotube composites.

[0039](3) Disperse the composite material obtained in step (2) into 10 mL of n-butanol solvent, then add butyl titanate, and form a uniform dispersion by stirring. The mass fraction of the composite material in the dispersion liquid is 20 parts, and the mass fraction of...

Embodiment 2

[0043] A kind of graphite phase C that the present invention relates to 3 N 4 / The preparation method of carbon nanotube composite counter electrode, comprises steps as follows:

[0044] (1) Add 500mg of carbon nanotubes to 25mL, 20wt% cyanamide solution, heat and reflux at 90°C for 6 hours, then filter, and dry at 60°C under vacuum to obtain carbon nanotubes with cyanamide adsorbed on the surface .

[0045] (2) Put the carbon nanotubes prepared in step (1) into a tube furnace, control the heating rate to 6° C. / min, raise the temperature to 600° C., and heat-treat for 2 hours under a nitrogen atmosphere; cool to room temperature to obtain a graphite phase C 3 N 4 / carbon nanotube composites.

[0046] (3) Disperse the composite material obtained in step (2) into 10 mL of isopropanol solvent, then add titanium isopropoxide, and form a uniform dispersion by grinding. The mass fraction of the composite material in the dispersion is 60 parts, and the mass fraction of the add...

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Abstract

The invention discloses a graphite phase C 3 N 4 The preparation method of carbon nanotube composite counter electrode comprises the steps as follows: carbon nanotubes are added in cyandiamide or dicyandiamide solution, filtered after heating and refluxing, and dried to obtain cyanamide or dicyandiamide adsorbed on the surface Carbon nanotubes; put the prepared carbon nanotubes into a tube furnace, heat up, and heat-treat in a nitrogen atmosphere; cool to room temperature to obtain graphite phase C 3 N 4 / carbon nanotube composite material; mix the obtained composite material with solvent and additives to form a dispersion; apply the dispersion evenly to the surface of the electrode substrate to make the surface covered with graphite phase C 3 N 4 / The electrode substrate of the carbon nanotube composite film; the electrode substrate is dried under vacuum conditions to prepare the graphite phase C 3 N 4 / carbon nanotube composite counter electrode. The beneficial effect is: it is beneficial to the transfer of electrons; it can effectively reduce carbon nanotubes and graphite phase C 3 N 4 The aggregation increases its catalytic surface area. The preparation process is simple, does not require complex equipment, and is easy for industrial mass production.

Description

technical field [0001] The present invention relates to solar cell technology, in particular to a graphite phase C for dye-sensitized solar cells 3 N 4 Preparation method of carbon nanotube composite counter electrode. Background technique [0002] Dye-sensitized solar cells have attracted widespread attention due to their simple manufacturing process, low cost, and high conversion efficiency. The counter electrode is the main component of dye-sensitized solar cells. Its main function is to accept electrons from an external circuit and catalyze the reduction of electrolytes. I in 3 - for I - . At present, the counter electrode of dye-sensitized solar cells is mainly platinum counter electrode, but platinum is a rare and precious metal, the price is too high, and it contains I - / I 3 - The poor stability of redox couples in electrolytes thus hinders the large-scale industrial production and commercial application of dye-sensitized solar cells. Therefore, it has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/20H01G9/042
Inventor 王桂强况帅张伟
Owner BOHAI UNIV
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