Metal-nitrogen-carbon catalyst for carbon dioxide electroreduction and preparation method of metal-nitrogen-carbon catalyst

A technology of carbon dioxide and carbon catalysts, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve high degree of graphitization, good electrical conductivity, and the effect of promoting charge and material transport

Pending Publication Date: 2020-09-22
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price of gold and silver limits their application

Method used

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  • Metal-nitrogen-carbon catalyst for carbon dioxide electroreduction and preparation method of metal-nitrogen-carbon catalyst
  • Metal-nitrogen-carbon catalyst for carbon dioxide electroreduction and preparation method of metal-nitrogen-carbon catalyst
  • Metal-nitrogen-carbon catalyst for carbon dioxide electroreduction and preparation method of metal-nitrogen-carbon catalyst

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preparation example Construction

[0023] The preparation method of metal-nitrogen-carbon catalyst for carbon dioxide electroreduction of the present invention comprises the following steps:

[0024] Provide carbon-based nanocages;

[0025] providing a transition metal salt solution;

[0026] After dispersing the carbon-based nanocages with a solvent, adding a transition metal salt solution, reacting, and drying to obtain a precursor;

[0027] The precursor is heat-treated at 800-1000° C. under an inert atmosphere, then pickled and dried to obtain a metal-nitrogen-carbon catalyst for carbon dioxide electroreduction.

[0028] The invention provides a three-dimensional hierarchical carbon-based nanocage with a high specific surface area, by preparing a metal ion salt solution; ultrasonically dispersing the carbon-based nano-cage and evaporating the solvent to dryness; complexing the metal loaded on the carbon-based nano-cage The metal-nitrogen-carbon unit site is formed by heat treatment of the precursor in an ...

Embodiment 1

[0030] Ni-N-hCNCs:

[0031] Weigh 64.8 mg of nickel chloride and 180.2 mg of phenanthroline, add 20 mL of ethanol to dissolve, and prepare the precursor solution of phenanthroline and nickel for future use. Weigh 50 mghCNCs, add it to the precursor solution, mix and stir for 30 min at room temperature, and ultrasonicate for 30 min, then stir the mixed solution at 70 ° C to evaporate the solvent; grind it into powder and place it in a tube furnace, and heat it at 200 mL min -1 Under the protection of Ar flow, at 10°C min -1 After the temperature was raised to 900°C, it was fired for 2 hours. After the sample is cooled to room temperature, the sample is taken out to obtain a catalyst containing nickel nanoparticles. The prepared catalyst containing nickel nanoparticles was placed in a flask, and 250mL1molL was added -1 The hydrochloric acid solution was stirred and washed at 80°C for 16h to dissolve the nickel nanoparticles; after filtration, it was dried in a drying oven at ...

Embodiment 2

[0034] Fe-N-hCNCs:

[0035] Weigh 81.1 mg of ferric chloride and 180.2 mg of phenanthroline, add 20 mL of ethanol to dissolve, and prepare the precursor solution of phenanthroline and iron for future use. Weigh 50 mghCNCs, add it to the precursor solution, mix and stir for 30 min at room temperature, and ultrasonicate for 30 min, then stir the mixed solution at 70 ° C to evaporate the solvent; grind it into powder and place it in a tube furnace, and heat it at 200 mL min -1 Under the protection of Ar flow, at 10°C min -1 After the temperature was raised to 900°C, it was fired for 2 hours. After the sample is cooled to room temperature, the sample is taken out to obtain a catalyst containing iron nanoparticles. The prepared iron-containing nanoparticles catalyst was placed in a beaker, and 250mL1molL was added -1The hydrochloric acid solution was stirred and washed at 80°C for 16h to dissolve the iron nanoparticles; after filtration, it was dried in a drying oven at 70°C for...

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Abstract

The invention provides a metal-nitrogen-carbon catalyst for carbon dioxide electroreduction. The metal-nitrogen-carbon catalyst comprises a carrier and an active component. Metal-nitrogen-carbon unitpoints are loaded on the surface of carbon-based nanocages, and the dispersity and the loading capacity of the unit points are greatly improved by utilizing the three-dimensional hierarchical structure and the high specific surface area of the nanocages. The nickel-nitrogen-carbon single-site catalyst is used for carbon dioxide electroreduction, and the Faraday efficiency of a carbon monoxide product reaches 87-94% at a wide voltage window of -0.6 V to -1.0 V; through sulfur doping, the specific current density of carbon monoxide is increased from 22.3 Ag<-1> to 37.5 Ag<-1>, and the Faraday efficiency of carbon monoxide reaches 90-95% in the same voltage window.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide electroreduction, in particular to a metal-nitrogen-carbon catalyst for carbon dioxide electroreduction and a preparation method thereof. Background technique [0002] Energy shortage and environmental pollution are two major challenges facing human society. At present, the world's energy consumption is still highly dependent on fossil fuels. With the growth of world population, energy consumption continues to grow rapidly, and a large amount of carbon dioxide (CO 2 ) emissions have caused the "greenhouse effect", which has caused serious climate problems such as global temperature rise. Effectively reduce CO in the atmosphere 2 Concentration and further conversion into useful chemicals or fuels has become a hot research topic worldwide. Electrochemical reduction of CO 2 Has great application prospects, but due to CO 2 The molecule is very stable (the dissociation energy of the C=O bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/10B01J37/08C25B1/00C25B11/06
CPCB01J27/24B01J35/0033B01J35/10B01J37/082B01J37/084C25B1/00
Inventor 陈轶群吕品吴强王喜章杨立军胡征
Owner NANJING UNIV
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