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Method for improving electrode catalytic activity of CO2 for electrochemical reduction

A catalytically active and electrochemical technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as mass transfer polarization, and achieve the effects of sufficient supply, improved selectivity, and increased generation rate

Active Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the ERC reaction rate is high, the ERC reaction will be affected by the CO 2 Insufficient concentration constraints, which lead to severe mass transfer polarization and promote the violent occurrence of competitive hydrogen evolution side reactions

Method used

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  • Method for improving electrode catalytic activity of CO2 for electrochemical reduction
  • Method for improving electrode catalytic activity of CO2 for electrochemical reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Electrode material pretreatment: copper content ≥ 99.5%, thickness 100 microns, area 10 cm 2 The copper sheet is used as the electrode material. First, soak it in concentrated hydrochloric acid with a volume fraction of 36% to 38% at room temperature for 20 minutes to remove surface impurities, then rinse it with a large amount of deionized water until it is neutral, and use high-purity nitrogen blow dry;

[0024] 2. Preparation of the surface modifier solution: use analytically pure ethanol as the solvent and polycarbonate (PC) as the solute to prepare a solution with a mass concentration of PC of 5 mM.

[0025] 3. Surface modification of Cu sheet electrode: At room temperature, use a pipette to absorb 1ml of the surface modifier solution prepared in step 2, drop-coat it on the surface of the Cu sheet electrode that will be treated in step 1, and let it stand for 20s, and the Cu sheet electrode will appear Surface dry, control high purity N 2 The flow rate does no...

Embodiment 2

[0029] 1. Electrode material pretreatment: Silver content ≥ 99.5%, thickness 50 microns, area 10 cm 2 The silver sheet was used as the electrode material. First, it was soaked in 85% phosphoric acid at room temperature as the working electrode, the Pt sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. Use a potentiostat, control the electrolysis voltage to 1V and treat for 10 minutes to remove impurities such as surface scale, then rinse with a large amount of deionized water until neutral, and dry with high-purity argon;

[0030] 2. Preparation of the surface modifier solution: use analytically pure isopropanol as the solvent and dimethyl carbonate as the solute to prepare a surface modifier solution with a mass concentration of 20 mM.

[0031] 3. Surface modification of the Ag sheet electrode: At room temperature, use a straw to absorb 1ml of the surface modifier solution prepared in step 2, use a spray pen to sp...

Embodiment 3

[0035] 1. Preparation of Au electrode supported by porous carbon paper: with a thickness of 0.10mm and an area of ​​5cm 2 The TGP-H-090 carbon paper is used as a porous conductive material, in the presence of 5mM HAuCl 4 , 0.5M H 2 SO 4 In the plating solution, at 5mAcm -2 , Deposit a thin layer of Au particles on the surface of carbon paper under the condition of 30min, the loading of Au is about 0.3mg cm -2 . After taking out the electrode, rinse the surface with a large amount of deionized water, and dry it with high-purity Ar for later use;

[0036] 2. Electrode material pretreatment: use the loaded Au obtained in step 1 as the electrode material, first soak it in phosphoric acid with a mass fraction of 85% at room temperature as the working electrode, and use the Pt sheet as the counter electrode, and saturate calomel electrode as a reference electrode. Use a potentiostat, control the electrolysis voltage to 4V and treat for 5 minutes to remove impurities such as su...

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Abstract

The invention provides a method for improving electrode catalytic activity of carbon dioxide for electrochemical reduction. The method is characterized in that surface modification is performed on electrode materials by a surface modification agent, the surface modification agent is an ester compound containing carbonyl group which has the capacity of adsorbing and capturing CO2 and changes the adsorption and desorption strength of electrode surfaces on reaction intermediate products, by means of the electrode treated by the surface modification agent, the generation rate of the target productof ERC reaction can be increased, the restriction of CO2 mass transfer polarization is alleviated, meanwhile, the generation rate of competitive hydrogen dissociation side reaction is reduced, and then the selectivity of the target product of the ERC reaction is improved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to a method for improving the catalytic activity of an electrode. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 Reduction to the target product to achieve CO 2 A technology for transformation and efficient use. Since ERC technology can use water as the source of protonated hydrogen, CO2 can be realized at normal temperature and pressure. 2 The high-efficiency transformation has the advantages of simple operation and low cost. [0003] At present, the main factors for the slow development of ERC technology include: (1) high reaction overpotential; (2) low catalytic activity and slow reaction rate; (3) poor selectivity of target products. In the ERC reaction system with an aqueous solution as the supporting electrolyte, flat metals (such as sheets, foils, and blocks) are ...

Claims

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Application Information

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IPC IPC(8): C25B11/06
CPCC25B11/04
Inventor 邱艳玲张华民钟和香李先锋张桃桃
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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