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A silver-based catalyst for electrochemical reduction of carbon dioxide and preparation method thereof

A carbon dioxide and catalyst technology, which is applied in the field of silver-based catalyst for electrochemical reduction of carbon dioxide and its preparation, can solve the problem of high silver overpotential, and achieve the effects of improving conversion rate, reducing catalytic overpotential, and stable loading.

Active Publication Date: 2021-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the problem that the overpotential of silver is too high during the electrochemical reduction of carbon dioxide, and to provide a silver-based catalyst for electrochemical reduction of carbon dioxide and its preparation method

Method used

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  • A silver-based catalyst for electrochemical reduction of carbon dioxide and preparation method thereof
  • A silver-based catalyst for electrochemical reduction of carbon dioxide and preparation method thereof
  • A silver-based catalyst for electrochemical reduction of carbon dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Remember 1 cm × 2 cm of rectangular foamed silver sheet with foam, then the resulting foam sheet was tested for 15 min with acetone, ethanol and deionized water, dried in a 50 ° C oven and fell into a dryer. Preferences.

[0027] (2) 0.2 g / ml of polyacrylic acid (PAA) 500 μL and 500 μL of ammonia water (2M) was completely dissolved in 16.5 ml of deionized water, and two steps (1) processed foam sheets were added, and then stirred at room temperature. 10 min, 75 ml of isopropanol (IPA) was sufficiently dispersed in the solution, and then 7.5 ml of 5 mg / ml dopamine hydrochloride solution was added at 50 ° C for 3.5 h in the mixture, with water and IPA final volume. The ratio is 1: 3. The foam piece was taken out.

[0028] (3) Silver ammonia solution configuration: 4 mL of ammonia water (2M) was diluted with water to 50 mL to 10 g / ml of silver nitrate solution until brown disappeared.

[0029] (4) Preparation of foam silver sheets prepared by step (2) in step (3) pre...

Embodiment 2

[0031] (1) The rectangular foam piece of 1 cm × 2 cm with foam, then then treated with acetone, ethanol and deionized water, and dried in a 50 ° C oven and fell into the dryer.

[0032] (2) 0.2 g / ml of polyacrylic acid (PAA) 500 μL and 500 μL of ammonia water (2M) was completely dissolved in 16.5 ml of deionized water, and two steps (1) processed foam sheets were added, and then stirred at room temperature. 10 min, 75 ml of isopropanol (IPA) was sufficiently dispersed in the solution, and then 7.5 ml of 5 mg / ml dopamine hydrochloride solution was added at 50 ° C for 3.5 h in the mixture, with water and IPA final volume. The ratio is 1: 3.

[0033] (3) Silvermonia solution configuration: 4 mL of ammonia (2 m) was diluted to 50 mL to 100 mL of 10 g / ml of silver nitrate solution until brown disappeared.

[0034] (4) Putting the foam silver sheet prepared by step (2) into step (3) prepared for 2 h after preparing for 2 h, placed in silver nitrate, 0.2 g of 3,5-dicarboxylic acid ...

Embodiment 3

[0038] (1) The rectangular foam piece of 1 cm × 2 cm with foam, then then treated with acetone, ethanol and deionized water, and dried in a 50 ° C oven and fell into the dryer.

[0039] (2) Take 0.2 g / ml of polyacrylic acid (PAA) 500 μL and 500 μL of ammonia water (2M) in 16.5 ml of deionized water, add two treated foam, then stirred at room temperature for 10 min, add 75ml Isopropanol (IPA) is sufficiently dispersed in solution, followed by adding 7.5 mg / ml of dopamine hydrochloride solution at 50 ° C for 3.5 h in the mixture, wherein the final volume ratio of water and IPA is 1: 3.

[0040] (3) Silvermonia solution configuration: 4 mL of ammonia (2 m) was diluted to 50 mL to 100 mL of 10 g / ml of silver nitrate solution until brown disappeared.

[0041] (4) Putting the foam silver sheet prepared by step (2) in the step (3) prepared for 2 h, add 40 ml of silver nitrate, 0.2 g of 3,5-dicarboxylic acid pyridine containing 0.64 g of nitrateIn deionized water, ultrasonic mixing is...

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Abstract

The invention discloses a silver-based catalyst for electrochemically reducing carbon dioxide and a preparation method thereof. The invention discloses a silver-based catalyst for electrochemically reducing carbon dioxide, comprising a foamed silver substrate and a metal-organic framework supported on the foamed silver substrate. The preparation method is as follows: 1. Add the foamed silver substrate into the mixed solution of polyacrylic acid and ammonia water, add isopropanol, and then add dopamine hydrochloride solution, and take out the foamed silver substrate after fully reacting. 2. Put the foamed silver substrate obtained in step 1 into the metal-ammonia solution and stir it, then put it into the mixed solution of nitrate and 3,5-dicarboxylic acid pyridine and carry out hydrothermal reaction. The present invention loads metal-organic frameworks on foamed silver, which significantly improves the Faraday efficiency of foamed silver to CO, reaching 91.21%, and basically does not generate formic acid, can efficiently catalyze and electrochemically reduce carbon dioxide to carbon monoxide, and can effectively solve the concentration of carbon dioxide in the atmosphere To improve the carbon cycle industry chain, it has a good application prospect.

Description

Technical field [0001] The present invention belongs to the field of carbon dioxide reducing catalyst, and more particularly to an silver-based catalyst for electrochemically reduction carbon dioxide and a preparation method thereof. Background technique [0002] Since the industrial revolution, traditional fossil fuels including coal, oil and gas become the most important energy supply of human society, while the main combustion product carbon dioxide in the fossil fuel is also increasingly increasing. Excessive emissions of carbon dioxide can lead to a series of environmental problems, including greenhouse effects, sea level rise, El Nio frequent distribution and land saline. Currently, electrochemical, photochemical, thermochemistry and biochemistry can treat carbon dioxide, among which electrochemical reduction carbon dioxide is most potential, the reason is that its reaction conditions are simple and higher conversion, and there is a potential for large-scale industrializati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/23C25B11/031C25B11/095
CPCC25B1/00
Inventor 宋爽朱颖何志桥
Owner ZHEJIANG UNIV OF TECH
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