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Gas diffusion layer for electrochemical reduction of carbon dioxide and preparation method of gas diffusion layer

A gas diffusion layer, carbon dioxide technology, applied in electrodes, electrolysis components, electrolysis process and other directions, can solve the problems of unfavorable gaseous carbon dioxide transportation, low conversion efficiency, low carbon dioxide reduction current density, etc., and achieves low production cost, simple preparation process, The effect of improving gas diffusivity

Pending Publication Date: 2022-05-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode pores of conventional gas diffusion electrodes contain hydrophilic macropores; this is not conducive to the transportation of gaseous carbon dioxide during the electrochemical reduction of carbon dioxide, resulting in low current density and low conversion efficiency of carbon dioxide reduction.

Method used

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  • Gas diffusion layer for electrochemical reduction of carbon dioxide and preparation method of gas diffusion layer
  • Gas diffusion layer for electrochemical reduction of carbon dioxide and preparation method of gas diffusion layer
  • Gas diffusion layer for electrochemical reduction of carbon dioxide and preparation method of gas diffusion layer

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preparation example Construction

[0037] The preparation method of the aforementioned gas diffusion layer comprises the following steps:

[0038] 1) Immerse the base layer in a certain concentration of hydrophobic agent emulsion for 1-60s, then take it out and dry it at 50-80°C to constant weight;

[0039] 2) Repeat the above process until the base layer and hydrophobic agent reach a certain mass ratio, the mass ratio range is 1:0.05~1:4;

[0040] 3) Mix the conductive material, the hydrophobic agent emulsion and the dispersant, stir fully to make the conductive material and the hydrophobic agent fully contact, and obtain the microporous layer slurry; the mass ratio of the conductive material to the hydrophobic agent is 1:0.05~1:2 The dispersant is a mixture of one or more of dehydrated alcohol, isopropanol, ultrapure water, etc. mixed in any proportion;

[0041]4) Deposit the conductive material / hydrophobic agent mixed slurry obtained in step 3) onto one side of the base layer treated with the hydrophobic ag...

Embodiment 1

[0046] This embodiment relates to a gas diffusion layer for electrolytic electrochemical reduction of carbon dioxide and its preparation method, the steps are as follows:

[0047] 1) Soak the WOS1009 carbon cloth produced by Carbon Energy CeTech Company in 5wt% polytetrafluoroethylene emulsion for 30 seconds, take it out and vacuum dry it to a constant weight in a drying oven at 60°C. Repeat the above steps until the weight difference between the impregnated and dried carbon cloth accounts for 30wt% of the total weight of the impregnated and dried carbon cloth.

[0048] 2) Mix 5g of Vulcan XC-72 conductive carbon black, 25g of 5wt% polytetrafluoroethylene emulsion (containing 1.25g of polytetrafluoroethylene) and 10g of absolute ethanol, stir well to make it evenly mixed.

[0049] 3) Coating the emulsion in 2) by screen printing on one surface of the 6×11 cm carbon cloth obtained in 1) after the hydrophobic treatment, to obtain a diffusion electrode layer precursor.

[0050] ...

Embodiment 2

[0055] A gas diffusion layer for electrolytic electrochemical reduction of carbon dioxide and a preparation method thereof, the steps are as follows:

[0056] 1) Soak Toray TGP-H-060 carbon paper produced by Toray Corporation in Japan in 5wt% polytetrafluoroethylene emulsion for 30 seconds, take it out and vacuum-dry it in a drying oven at 60°C to a constant weight. Repeat the above steps until the weight difference between the impregnated and dried carbon cloth accounts for 10wt% of the total weight of the impregnated and dried carbon cloth.

[0057] 2) 1g Vulcan XC-72R conductive carbon black, 0.42g 60wt% polytetrafluoroethylene emulsion (containing 0.25g polytetrafluoroethylene), 0.1g ultrapure water and 0.2g isopropanol were ultrasonically treated for 30 minutes.

[0058] 3) Spray-coat the uniform emulsion obtained in 2) on one side of Toray TGP-H-060 carbon paper, and the loading amount of conductive carbon black in the microporous layer is 1 mg cm -2 , to obtain the pre...

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Abstract

The invention relates to a gas diffusion layer for electrochemical reduction of carbon dioxide and a preparation method of the gas diffusion layer. The gas diffusion layer is composed of a substrate layer and a microporous layer. The preparation method comprises the following steps: soaking the substrate layer with a water repellent agent; carrying out drying treatment on the soaked substrate layer; a hydrophobic agent, a conductive material and a solvent are blended to prepare a mixed emulsion, and then one side of the dried substrate layer is coated with the mixed emulsion to form a microporous layer; and finally performing high-temperature treatment to prepare the gas diffusion layer. The gas diffusion layer is suitable for the technical field of carbon dioxide electrochemical reduction, the porosity is 70% or above, the pore volume of the hydrophobic pores accounts for 90% or above of the total pore volume, the diffusion layer comprises the hydrophobic micropores with the pore diameter smaller than 5 micrometers, and mass transfer of carbon dioxide gas in a gas diffusion electrode can be promoted. The preparation method of the gas diffusion layer provided by the invention is simple in preparation process and can be amplified on a large scale, and a carbon dioxide reduction electrolytic tank assembled by using the gas diffusion layer as a cathode diffusion layer shows very high running current density and has very high application value.

Description

technical field [0001] The present invention relates to the electrolysis technology of carbon dioxide electrochemical reduction, in particular to a gas diffusion layer for the electrochemical reduction of carbon dioxide and its preparation method, in particular to a carbon dioxide electrolysis layer composed of a base layer, a conductive material and a hydrophobic agent. Chemically reduced gas diffusion layer and method for its preparation. Background technique [0002] Carbon dioxide electrochemical reduction technology can use renewable electricity to convert carbon dioxide into high value-added chemicals and fuels, such as carbon monoxide, formic acid, ethylene, etc. The storage of energy provides a potential method and has become one of the research hotspots in the energy field. [0003] In addition to electrochemical catalysts, the mass transfer of gaseous carbon dioxide is also a key issue in the electrochemical reduction of carbon dioxide. Judging from the literatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/032C25B1/23C25B11/04
CPCC25B11/032C25B1/23C25B11/04
Inventor 柯长春万琦琪章俊良庄小东侯俊波刘莹莹蒋文星桂劼袁磊
Owner SHANGHAI JIAO TONG UNIV
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