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Electrode used for CO2 electrochemical reduction, and preparation and applications thereof

An electrochemical and electrode technology, which is applied in the field of electrochemical reduction of carbon dioxide, can solve the problems of small electrode reaction area, reduced electrode reaction area, and high potential, and achieve the effect of satisfying the reaction area, shortening the preparation cycle, and simplifying the preparation process

Active Publication Date: 2019-06-07
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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  • Electrode used for CO2 electrochemical reduction, and preparation and applications thereof
  • Electrode used for CO2 electrochemical reduction, and preparation and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Pretreatment of the base material: with a thickness of 100 microns and an area of ​​10 cm 2 As the base material, the copper foil is first immersed in concentrated hydrochloric acid with a volume fraction of 36% to 38% at room temperature for 10 minutes to remove impurities such as surface oxide scale, and then rinsed with a large amount of deionized water to neutrality. Blow dry with high purity argon;

[0028] 2. Preparation of Cu nano-array modified copper electrode: First, deionized water is used to prepare anodizing treatment solution containing 0.3M sodium chloride and 5mM cetyltrimethylammonium bromide (CTAB), and 0.8M NaOH Cathode auxiliary solution. The two solutions were transferred into the anode and cathode compartments of the H-shaped electrolytic cell. 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 water bath temperature of...

Embodiment 2

[0033] 1. Pretreatment of base material: In content is 99.9%, thickness is 200 microns, area is 5cm 2 As the base material, firstly immerse it in absolute ethanol for 50 minutes at room temperature to remove the surface oil stains, and dry it with high-purity Ar; then immerse it in 5% hydrochloric acid for 30 minutes ,Remove surface oxide scale and other impurities, then rinse with a large amount of deionized water to neutral, and blow dry with high-purity Ar gas;

[0034] 2. Preparation of indium electrode modified by In nanoarray: firstly, deionized water is used to prepare anodizing treatment solution containing 0.2M potassium chloride and 1mM cetyltrimethylammonium chloride (CTAC), and 0.1M NaOH Cathode auxiliary solution. The two solutions were transferred into the anode and cathode compartments of the H-shaped electrolytic cell. The electrolytic cell uses polyimide with a hydroxide ion conductivity of 0.05 Scm as the diaphragm.

[0035] Put the electrolytic cell in a consta...

Embodiment 3

[0039] 1. Pretreatment of base material: Sn content is 99.7%, thickness is 2mm, area is 5cm 2 As the base material, first immerse it in acetone at room temperature for 30 minutes to remove oil stains on the surface, and dry it with high-purity Ar; then immerse it 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 blow dry with high-purity Ar gas;

[0040] 2. Preparation of tin plate electrode modified by Sn nano-array: First, deionized water is used to prepare an anodizing solution containing 0.5M rubidium chloride and 0.5mM octadecyltrimethylammonium bromide, and a cathode of 2.0M NaOH Auxiliary solution. The two solutions were transferred into the anode and cathode compartments of the H-shaped electrolytic cell. The electrolytic cell uses polyimide with a hydroxide ion conductivity of 0.02 Scm as the diaphragm.

[0041] Put the electrolytic cell in a constant temperature ...

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Abstract

The invention relates to a nanometer array electrode used for CO2 electrochemical reduction, and preparation thereof. The nanometer array electrode is prepared through electrochemical anodic oxidationone-step method; on the surface of the electrode, catalytic particles are distributed in nanometer arrays. The preparation method of the electrode comprises following steps: firstly, a substrate material is subjected to oil removing and impurity removing processing; the substrate material is immersed in an anodic oxidation containing a cationic surfactant for electrochemical anodic oxidation processing so as to obtain the modified electrode with nanometer arrays on the surface. The characteristics are that: the nanometer array modified metal electrode is prepared in one step, preparation period is shortened; the catalyst diameter and length in the electrode nanometer arrays can be flexibly regulated and controlled through adjusting anodic oxidation parameters, and requirements of carbon dioxide electrochemical reduction technology on enlarging of electrode reaction area are satisfied.

Description

Technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and particularly relates to electrode materials in this field and preparation techniques thereof. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electric energy to reduce CO 2 Reduce to target product, realize CO 2 A technology for transformation and effective use. Since this technology can use water as a protonated hydrogen source, it has the advantages of abundant resources and low cost. In addition, the technology can be carried out under normal temperature and pressure, so the energy consumption caused by heating and pressurization required by chemical conversion technology is not required, and the equipment investment is small. [0003] At present, the main factors for the slow development of ERC technology include: (1) high reaction overpotential; (2) low catalytic activity; (3) poor selectivity of target products. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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