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Copper-based graphene aerogel composite catalyst, gas diffusion electrode and application

A graphene airgel and gas diffusion electrode technology, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor catalyst activity, low selectivity, and poor catalyst stability, so as to improve activity and selectivity, improve Favorable effect on selectivity, activity, and specific surface area

Active Publication Date: 2021-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of the copper oxide catalyst is poor, resulting in a small total current density of the reaction and poor catalyst activity; and the copper oxide catalyst has poor stability and is prone to agglomeration during the reaction process, leading to catalyst deactivation; C 2 h 4 Selectivity remains low (<40%)
In recent years, researchers have begun to pay attention to metal-carbon composite materials and use them in the field of electrocatalytic CO2 reduction, but the composite process of metal and carbon materials is still relatively complicated, and metal particles are easy to problems such as reunion

Method used

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  • Copper-based graphene aerogel composite catalyst, gas diffusion electrode and application
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  • Copper-based graphene aerogel composite catalyst, gas diffusion electrode and application

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preparation example Construction

[0038] In a second aspect, the embodiments of the present invention also provide a method for preparing a copper-based graphene airgel composite catalyst, comprising the following steps:

[0039] (1) Dissolve copper nitrate trihydrate in ethylene glycol, stir and heat, and prepare a copper salt precursor solution, which is designated as solution A.

[0040] (2) Disperse the graphene airgel powder in ethylene glycol, and ultrasonically treat it to prepare a uniform suspension, which is denoted as dispersion B.

[0041] (3) Add the dispersion B to the solution A and stir to obtain a mixed solution. The mixed solution is placed in a reaction kettle for solvothermal reaction, the product is naturally cooled, filtered, washed, dried and ground to obtain a catalyst.

[0042] In the preparation process of the above copper-based graphene airgel composite catalyst, copper nitrate trihydrate and graphene airgel were dissolved in ethylene glycol respectively, and then the ethylene glyco...

Embodiment 1

[0065] A copper-based graphene airgel composite catalyst, which includes graphene airgel and nano-copper oxide loaded thereon, the preparation method of the catalyst is a solvothermal method, and the specific steps are as follows:

[0066] (1) Ultrasonically disperse graphene oxide in an aqueous solution, freeze-dry it, and then reduce it to obtain a graphene airgel material.

[0067] (2) Dissolve 0.80 g of copper nitrate trihydrate in 200 mL of ethylene glycol, stir at 100° C. for 1 h, and prepare a copper precursor solution, which is designated as solution A.

[0068] (3) Disperse 0.20 g of graphene airgel in 100 mL of ethylene glycol, and ultrasonically treat it for 1 hour to prepare a uniform suspension, which is designated as dispersion B. Add dispersion B dropwise to solution A and stir for 1 h.

[0069] (4), put the mixed solution in the reactor, which is a 500mL hydrothermal synthesis reactor with a stainless steel jacket and a polytetrafluoroethylene liner, put the r...

Embodiment 2

[0082] A copper-based graphene airgel composite catalyst, which includes graphene airgel and nano-copper oxide loaded thereon, the preparation method of the catalyst is a solvothermal method, and the specific steps are as follows:

[0083] (1) Ultrasonically disperse graphene oxide in an aqueous solution, freeze-dry it, and then reduce it to obtain a graphene airgel material.

[0084] (2) Dissolve 0.80 g of copper nitrate trihydrate in 200 mL of ethylene glycol, stir at 100° C. for 1 h, and prepare a copper precursor solution, which is designated as solution A.

[0085] (3) Disperse 0.20 g of graphene airgel in 100 mL of ethylene glycol, and ultrasonically treat it for 1 hour to prepare a uniform suspension, which is designated as dispersion B. Add dispersion B dropwise to solution A and stir for 1 h.

[0086] (4), the mixed solution is placed in the reactor, which is a 500mL hydrothermal synthesis reactor with a stainless steel jacket and a polytetrafluoroethylene liner, and...

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Abstract

The invention discloses a copper-based graphene aerogel composite catalyst, a gas diffusion electrode and application, and a preparation method of the copper-based graphene aerogel composite catalyst comprises the following steps: respectively dispersing a copper salt and graphene aerogel in ethylene glycol to obtain a copper salt precursor solution and a graphene aerogel dispersion liquid; and mixing a copper salt precursor solution and the graphene aerogel dispersion liquid to obtain a mixed solution, and carrying out one-step solvothermal reaction on the mixed solution to prepare the copper-based graphene aerogel composite catalyst. The copper-based graphene aerogel composite catalyst comprises graphene aerogel, coralline-shaped nano cuprous oxide rods and nano copper rods, wherein the coralline-shaped nano cuprous oxide rods and the nano copper rods are loaded on the graphene aerogel, and the diameter of each of the nano cuprous oxide rods and the nano copper rods is 40-60 nm. The coralline-shaped nano cuprous oxide rod and the nano copper rod loaded on the graphene aerogel construct a Cu < + > and Cu coexisting CO2 catalytic reduction interface environment, and the Cu < + > and Cu coexisting CO2 catalytic reduction interface environment is used for carbon dioxide electric reduction, so that the catalytic reaction efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of electroreduction carbon dioxide catalysts, in particular to a copper-based graphene airgel composite catalyst, a gas diffusion electrode and applications. Background technique [0002] Extensive exploitation and utilization of fossil fuels lead to CO 2 Emissions have increased dramatically, resulting in atmospheric CO 2 The content keeps rising. while CO 2 The large amount of emissions has broken the natural carbon cycle, caused the greenhouse effect, and triggered a series of environmental problems such as sea level rise and abnormal climate. How to reduce CO 2 Emissions and converting them into fuels or chemicals has become a global research hotspot. Currently, CO 2 The main methods of transformation are thermal catalysis, biochemical method, photocatalysis and electrocatalysis. Compared with other conversion methods, the electrocatalytic method has the advantages of mild reaction conditions, con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/032C25B3/26C25B3/03
CPCC25B11/091C25B11/032C25B3/26C25B3/03Y02E60/50
Inventor 王敬楠李程于珊珊崔新安
Owner CHINA PETROLEUM & CHEM CORP
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