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Gas diffusion electrode, preparation method and application thereof

A gas diffusion electrode and body technology, applied in the field of electrochemical catalysis, can solve the problems of low energy utilization rate of electrochemical reduction of carbon dioxide, poor product selectivity, easy deactivation of catalysts, etc., to increase the catalytic activity of electrochemical reduction, increase Effect of contact area and improvement of Faraday efficiency

Pending Publication Date: 2021-01-22
SINOPEC NANJING RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the low energy utilization rate of electrochemical reduction of carbon dioxide, poor product selectivity, and easy deactivation of catalysts are the main factors that limit its application. The key to solving this problem is to develop electrode materials with specific selectivity and high catalytic activity.

Method used

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  • Gas diffusion electrode, preparation method and application thereof
  • Gas diffusion electrode, preparation method and application thereof
  • Gas diffusion electrode, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: catalyst preparation

[0046] Preparation concentration is that the sodium borohydride solution of 0.075%, the trisodium citrate solution that concentration is 1%, the chloroauric acid solution that concentration is 10% and the nickel chloride solution that concentration is 10%, place 100mg multi-walled carbon nanotube Put in a beaker containing 50mL deionized water and ultrasonically disperse for 30min, measure 150mL deionized water into a 500mL round bottom flask, add 1mL chloroauric acid solution and 1mL nickel chloride solution, add 2mL trisodium citrate solution drop by drop and 2mL of sodium borohydride solution, and finally add the graphite phase carbon nitride after pickling and ultrasonic stripping, and stir evenly in an ice-water bath for 2h at a stirring rate of 500rpm. After centrifugation, washing, and vacuum drying, graphite phase carbon nitride is obtained. The supported gold-nickel bimetallic catalyst, which is the electrochemical reduction...

Embodiment 2

[0047] Embodiment 2: catalyst preparation

[0048] The specific preparation process is as shown in Example 1. Only changing the type of the precursor solution of the second metal and adding 1 mL of silver nitrate solution with a concentration of 10% can obtain a gold-silver bimetallic catalyst supported by carbon nitride in the graphite phase, which is called AuAg / C 3 N 4 catalyst. For AuAg / C in embodiment 2 3 N 4 Catalysts were characterized by X-ray diffraction, such as figure 1 As shown, it can be seen that the catalyst includes multi-walled carbon nanotubes and two metal elements of gold and silver.

Embodiment 3

[0049] Embodiment 3: catalyst preparation

[0050] The specific preparation process is as shown in Example 1. Only changing the type of the precursor solution of the second metal, adding 1 mL of ferrous acetate solution with a concentration of 10%, can obtain the gold-iron bimetallic catalyst supported by carbon nitride in the graphite phase, called for AuFe / C 3 N 4 catalyst. For AuFe / C in embodiment 3 3 N 4 Catalysts were characterized by X-ray diffraction, such as figure 1 As shown, it can be seen that the catalyst includes multi-walled carbon nanotubes and two metal elements of gold and iron.

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Abstract

The invention relates to a gas diffusion electrode, which comprises a gas diffusion electrode body and a carbon dioxide electrochemical reduction catalyst loaded on the gas diffusion electrode body, wherein the carbon dioxide electrochemical reduction catalyst is graphite-phase carbon nitride supported gold-based bimetal, and the gold-based bimetal is composed of one of nickel, silver, iron, cobalt, copper, zinc and indium and gold. The invention further discloses a preparation method of the gas diffusion electrode, and application of the gas diffusion electrode in preparation of synthesis gasthrough electrochemical reduction of carbon dioxide. According to the invention, the gas diffusion electrode can improve the Faraday efficiency of the product synthesis gas in the electrochemical reduction of carbon dioxide, and can also accurately regulate and control the ratio of carbon monoxide to hydrogen in the synthesis gas.

Description

technical field [0001] The invention relates to the field of electrochemical catalysis, in particular to a gas diffusion electrode, a preparation method thereof and an application in preparation of synthesis gas by electrochemical reduction of carbon dioxide. Background technique [0002] Carbon dioxide electrochemical reduction is an important direction of carbon dioxide resource utilization technology, which can convert carbon dioxide into gaseous carbon monoxide, methane, ethylene, ethane, propylene, propane and liquid formic acid, methanol, formaldehyde, acetic acid, ethanol, ethane Aldehyde, ethylene glycol, oxalic acid and other substances produce economically valuable chemicals while slowing down the greenhouse effect brought by carbon dioxide. They have dual benefits of environment and economy, and have received extensive attention in recent years. [0003] Carbon dioxide is the product of the highest oxidation stage of carbon. From the perspective of chemical change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/032C25B11/091C25B1/23
CPCC25B1/00
Inventor 毛松柏傅杰李海涛黎梓浩汪东吕秀阳陈曦郭本帅
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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