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a co 2 Electrode for electrochemical reduction and its preparation and application

An electrochemical and electrode technology, applied in the field of electrochemical reduction of carbon dioxide, can solve the problems of loss of electrode activity, low conversion rate, reduction of electrode reaction area, etc.

Active Publication Date: 2020-10-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A prominent defect of this type of metal electrode is that the electrode reaction area is small, and it is only concentrated on the surface in contact with the supporting electrolyte, which constitutes a high ERC reaction overpotential and CO 2 An important reason for the low conversion rate; in addition, the covering and poisoning effect of the intermediate product on the electrode during the ERC reaction process will rapidly reduce the effective reaction area of ​​the electrode, and the electrode will quickly lose its activity.

Method used

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  • a co <sub>2</sub> Electrode for electrochemical reduction and its preparation and application
  • a co <sub>2</sub> Electrode for electrochemical reduction and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Base material pretreatment: with a thickness of 100 microns and an area of ​​10 cm 2 The copper foil is used as the base material. First, it is soaked in concentrated hydrochloric acid with a volume fraction of 36% to 38% for 10 minutes at room temperature to remove impurities such as surface oxide scale, and then rinsed with a large amount of deionized water to neutrality. Dry with high-purity argon;

[0028] 2. Preparation of Cu nanoarray-modified copper electrodes: First, an anodizing solution containing 0.3 M sodium chloride and 5 mM cetyltrimethylammonium bromide (CTAB) was prepared with deionized water, and 0.8 M NaOH Cathodic auxiliary solution. The two solutions were transferred into the anode compartment and cathode compartment of the H-type electrolytic cell, respectively. The electrolytic cell uses polyimide with a hydroxide ion conductivity of 0.08 Scm as the diaphragm.

[0029] Put the electrolytic cell into a constant temperature water bath with a wa...

Embodiment 2

[0033] 1. Pretreatment of the base material: the In content is 99.9%, the thickness is 200 microns, and the area is 5 cm 2 As the base material, the indium foil was first immersed in absolute ethanol for 50 minutes at room temperature to remove oil stains on the surface, and dried with high-purity Ar; then immersed in 5% hydrochloric acid for 30 minutes , remove impurities such as surface oxide scale, then rinse with a large amount of deionized water to neutrality, and dry with high-purity Ar gas;

[0034] 2. Preparation of In nanoarray-modified indium electrodes: First, an anodizing solution containing 0.2 M potassium chloride and 1 mM cetyltrimethylammonium chloride (CTAC) was prepared with deionized water, and 0.1 M NaOH Cathodic auxiliary solution. The two solutions were transferred into the anode compartment and cathode compartment of the H-type electrolytic cell, respectively. The electrolytic cell uses polyimide with a hydroxide ion conductivity of 0.05 Scm as the dia...

Embodiment 3

[0039] 1. Pretreatment of base material: with Sn content of 99.7%, thickness of 2 mm and area of ​​5 cm 2 As the base material, the tin sheet was first immersed in acetone at room temperature for 30 minutes to remove oil stains on the surface, and dried with high-purity Ar; then it was immersed in 1% hydrochloric acid for 5 minutes to remove Surface oxide scale and other impurities, then rinse with a large amount of deionized water to neutrality, and dry with high-purity Ar gas;

[0040] 2. Preparation of Sn nanoarray-modified tin sheet electrodes: First, an anodizing solution containing 0.5M rubidium chloride and 0.5mM octadecyltrimethylammonium bromide was prepared with deionized water, and a cathode with 2.0M NaOH was used auxiliary solution. The two solutions were transferred into the anode compartment and cathode compartment of the H-type electrolytic cell, respectively. The electrolytic cell uses polyimide with a hydroxide ion conductivity of 0.02 Scm as the diaphragm....

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Abstract

The present invention relates to a CO 2 Nano array electrode for electrochemical reduction and its preparation. The electrode is completed in one step by electrochemical anodic oxidation technology. The catalyst particles on the surface of the electrode are distributed in the form of nano-arrays. The preparation of the electrode includes the following steps: first, the substrate material is degreased and impurity-removed; then, the substrate material is soaked in an anodic oxidation solution containing a cationic surfactant for electrochemical anodic oxidation treatment to obtain a nanometer surface. array of modified electrodes. The characteristic of this method is that the nano-array modified metal electrode can be prepared in one step, which shortens the preparation cycle; the diameter and length of the catalyst in the nano-array of the prepared electrode can be flexibly adjusted by adjusting the anodic oxidation parameters, which can meet the electrochemical reduction of carbon dioxide. Technology needs to expand the electrode reaction area.

Description

technical field [0001] The invention belongs to the technical field of electrochemical reduction of carbon dioxide, and particularly relates to an electrode material in this field and a preparation technology thereof. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electrical energy to convert CO 2 Reduction to the target product to achieve CO 2 A technology for transformation and efficient use. Since this technology can utilize water as a protonated hydrogen source, it has the advantages of abundant resources and low cost. In addition, the technology can be carried out at normal temperature and pressure, so there is no need for energy consumption caused by heating and pressurization required by chemical conversion technology, and equipment investment is low. [0003] At present, the main factors for the slow development of ERC technology include: (1) high reaction overpotential; (2) low catalytic activity; (3) poor target p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25D11/34C25B1/00C25B3/04B82Y40/00C25B3/25
Inventor 邱艳玲张华民张桃桃李先锋姚鹏飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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