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Graphite phase C3N4/carbon nanotube composite counter electrode preparation method

A carbon nanotube composite and C3N4 technology, which is 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, so as to improve electrical conductivity and benefit electronics. The transfer, the effect of increasing the catalytic surface area

Inactive Publication Date: 2016-03-02
BOHAI UNIV
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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 C3N4/carbon nanotube composite counter electrode preparation method
  • Graphite phase C3N4/carbon nanotube composite counter electrode preparation method
  • Graphite phase C3N4/carbon nanotube composite counter electrode preparation method

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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 C3N4 / carbon nanotube composite counter electrode preparation method, comprising the steps of: adding a carbon nanotube into a cyanamide or dicyandiamide solution, and performing heating circumfluence, filtering, and drying to obtain a carbon nanotube having the surface adsorbing cyanamide or dicyandiamide; putting the prepared carbon nanotube in a tubular furnace for heating, and performing heat treatment in a nitrogen atmosphere; cooling the carbon nanotube to a room temperature to obtain a graphite phase C3N4 / carbon nanotube composite material; mixing the obtained composite material and an additive in a solvent to form a dispersion liquid; uniformly coating the dispersion liquid on the surface of an electrode substrate to prepare an electrode substrate having the surface being covered by a C3N4 / carbon nanotube composite material film; and performing drying treatment on the prepared electrode substrate under a vacuum condition to prepare a C3N4 / carbon nanotube composite counter electrode. The method is in favor of electronic transmission, and can effectively reduce carbon nanotube and graphite phase C3N4 aggregation, and increase a catalysis surface; the method has a simple preparation process, does not require complex equipment, and is easy to realize 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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IPC IPC(8): H01G9/20H01G9/042
Inventor 王桂强况帅张伟
Owner BOHAI UNIV
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