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Gas diffusion electrode for electrochemical reduction of carbon dioxide

A gas diffusion electrode and carbon dioxide technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problem of increased product separation cost, and achieve the effect of improving hydrophobic characteristics and efficient current collection and conductivity

Pending Publication Date: 2021-08-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, the main challenge of electrocatalytic carbon dioxide reduction is how to use low-cost equipment to efficiently reduce carbon dioxide with the lowest energy consumption. However, this process often produces a variety of reduction products, including carbon monoxide (CO), formic acid (HCOOH), methane (CH 4 ), ethylene (C 2 h 4 ) and ethanol (C 2 h 5 OH), etc., which increases the cost of product separation in the later stage

Method used

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  • Gas diffusion electrode for electrochemical reduction of carbon dioxide
  • Gas diffusion electrode for electrochemical reduction of carbon dioxide
  • Gas diffusion electrode for electrochemical reduction of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1: Use HESEN HCP120 as the carrier of the base layer of the gas diffusion electrode;

[0044] Step 2: Do not perform high-temperature sintering or magnetron sputtering hydrophobic treatment;

[0045] Step 3: Add 10 mg of copper powder catalyst and 40 μl of 5% Nafion into a mixed solution of 750 μl of ethylene glycol and 250 μl of ultrapure water, and sonicate for 2 hours. Spray the copper catalyst dispersion onto the base layer of HESEN HCP120 with a spray gun. During this process, the spray gun spray knob is adjusted to the minimum. According to the principle of small amount of multiple spraying, the heating platform is used to heat the solvent to quickly volatilize. Finally, the loading capacity is 1mg cm -2 the catalyst;

[0046] Step 4: Assemble the gas diffusion electrode into a three-chamber liquid flow electrolytic cell, with the waterproof base layer facing the catholyte (1M KOH) chamber side, and the catalytic layer facing the carbon dioxide gas side, and...

Embodiment 2

[0049] Step 1: Use HESEN HCP030N as the carrier of the base layer of the gas diffusion electrode;

[0050] Step 2: Do not perform high-temperature sintering or magnetron sputtering hydrophobic treatment;

[0051] Step 3: Add 10 mg of copper powder catalyst and 40 μl of 5% Nafion into a mixed solution of 750 μl of ethylene glycol and 250 μl of ultrapure water, and sonicate for 2 hours. Spray the copper catalyst dispersion onto the base layer of HESEN HCP030N with a spray gun. During this process, the spray gun spray knob is adjusted to the minimum. According to the principle of small amount of multiple spraying, the heating platform is used to heat the solvent to quickly volatilize, and finally the loading capacity is 1mg cm -2 the catalyst;

[0052] Step 4: Assemble the gas diffusion electrode into the three-chamber liquid flow electrolytic cell, the waterproof base layer faces the side of the catholyte (1M KOH) chamber, the catalytic layer faces the side of the carbon dioxid...

Embodiment 3

[0055] Step 1: Use YLS-30T as the carrier of the base layer of the gas diffusion electrode;

[0056] Step 2: Do not perform high-temperature sintering or magnetron sputtering hydrophobic treatment;

[0057] Step 3: Add 10 mg of copper powder catalyst and 40 μl of 5% Nafion into a mixed solution of 750 μl of ethylene glycol and 250 μl of ultrapure water, and sonicate for 2 hours. Spray the copper catalyst dispersion onto the YLS-30T base layer with a spray gun. During this process, the spray gun spray knob is adjusted to the minimum. According to the principle of small amount of multiple spraying, the heating platform is used to heat the solvent to evaporate quickly, and finally the loading capacity is 1mg cm -2 the catalyst;

[0058] Step 4: Assemble the prepared electrode into the three-chamber flow electrolysis cell, the waterproof base layer of the gas diffusion electrode faces the catholyte (1M KOH) cavity side, and the catalytic layer of the gas diffusion electrode faces...

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Abstract

The invention discloses a gas diffusion electrode for preparing hydrocarbon fuel through electrochemical reduction of carbon dioxide. The process of obtaining the gas diffusion electrode comprises the following steps: selecting substrate materials with different hydrophobic properties as a first waterproof breathable layer substrate; performing high-temperature sintering or magnetron sputtering on the waterproof breathable substrate to complete further hydrophobic treatment of the gas diffusion electrode; and finally, improving the conductivity and the electro-catalytic performance of the waterproof breathable electrode through a spray gun spraying method. According to the invention, the influence of the key factors on the performance of electrochemical reduction of carbon dioxide is researched by changing conditions, so that the optimized gas diffusion electrode is obtained; by arranging a layered structure, the effects of preventing electrolyte from overflowing and carbon dioxide gas from permeating in an alkaline flowing electrolytic tank are achieved, so that an ideal gas-liquid-solid carbon dioxide-electrolyte-copper-based catalyst three-phase interface is formed for an electrochemical carbon dioxide reduction reaction.

Description

technical field [0001] The invention relates to a gas diffusion electrode used for electrochemically reducing carbon dioxide to prepare hydrocarbon (oxygen) fuel, and belongs to the field of carbon dioxide reduction. Background technique [0002] With the increasing use of fossil fuels in modern society, the balance of the earth's carbon cycle has been severely disrupted, leading to a dramatic increase in the content of carbon dioxide in the atmosphere, resulting in a series of problems such as global temperature rise (greenhouse effect) and sea level rise. In order to solve the above problems, the efficient capture of excess carbon dioxide and the conversion of carbon dioxide into value-added useful chemicals have become a research hotspot that scientists are paying close attention to. Abundant clean energy such as solar and wind energy can be converted into renewable electrical energy, and the generation of value-added and efficient hydrocarbon (oxygen) fuels by electroche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/032C23C14/35C23C14/20C25B1/23C25B3/26C25B3/03C25B3/07C25B11/075C25B11/052
CPCC25B11/032C23C14/35C23C14/205C25B1/23C25B3/26C25B3/03C25B3/07C25B11/075C25B11/052
Inventor 段静静郑敏杨康陈胜马路山李强
Owner NANJING UNIV OF SCI & TECH