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Negative electrode for electroreduction of carbon dioxide and preparation method thereof

A carbon dioxide and cathode technology, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of inapplicability, achieve the effects of improving selectivity and activity, increasing concentration, and reducing mass transfer resistance

Active Publication Date: 2018-03-27
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

Therefore, the electrode of this structure of the fuel cell is not suitable for carbon dioxide electroreduction technology

Method used

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  • Negative electrode for electroreduction of carbon dioxide and preparation method thereof
  • Negative electrode for electroreduction of carbon dioxide and preparation method thereof
  • Negative electrode for electroreduction of carbon dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Nitrogen-doped nano-carbon materials were prepared using nano-calcium carbonate as a template. Accurately weigh 5g of sucrose, add 2g of ethylenediamine into 10ml of water and stir until completely dispersed, then add 5g of calcium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in a vacuum at 80°C after the water is completely evaporated Dry for 24h. Then put the dried product into high temperature tube furnace for carbonization, N 2 Treat at 850℃ for 3h, change CO 2 Purging at 850°C for 1 hour to obtain nanoparticle / carbon composites, then removing calcium carbonate with an appropriate amount of 2M dilute hydrochloric acid, and then vacuum drying at 80°C for 24 hours after filtration to obtain the macroporous nitrogen-doped nanocarbon material.

[0055] Dissolve 6.16 resorcinol in 7mL deionized water to form solution A; then dropwise add 8.4ml of formaldehyde solution with a mass concentration of 37% to form...

Embodiment 2

[0060] Nitrogen-doped nano-carbon materials were prepared using nano-calcium carbonate as a template. Accurately weigh 5g of sucrose, add 2g of ethylenediamine into 10ml of water and stir until completely dispersed, then add 5g of calcium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in a vacuum at 80°C after the water is completely evaporated Dry for 24h. Then put the dried product into high temperature tube furnace for carbonization, N 2 Treat at 850℃ for 3h, change CO 2 Purging at 850°C for 1 hour to obtain nanoparticle / carbon composites, then removing calcium carbonate with an appropriate amount of 2M dilute hydrochloric acid, and then vacuum drying at 80°C for 24 hours after filtration to obtain the macroporous nitrogen-doped nanocarbon material.

[0061] Dissolve 7.06g of melamine in 10mL of deionized water to form solution A; add dropwise 12.3ml of formaldehyde solution with a mass concentration of 37% to th...

Embodiment 3

[0064] P-doped nano-carbon materials were prepared using nano-alumina as a template. Accurately weigh 3.15g of melamine, 5.0ml of formaldehyde solution, 10ml of water, stir at 85°C for 20min until completely dissolved into a transparent state, then add 4g of alumina after 0.2g of triphenylphosphine, heat in a water bath at 80°C and Stir mechanically to make it completely dispersed, and put it into vacuum drying at 60°C for 24 hours after the water is completely evaporated. Then put the dried product into a high-temperature tube furnace for carbonization, the atmosphere is nitrogen, and the gas flow is controlled at 20ml / min. Take out at 900 DEG C by carbonization for 2 hours to obtain the nanoparticle / carbon composite, remove the nano-alumina with an appropriate amount of 2M dilute hydrochloric acid, and vacuum dry at 80 DEG C for 24 hours after filtration to obtain the P-doped macroporous carbon material (phosphorus content 0.9%).

[0065] Dissolve 7.06g of melamine in 10mL...

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Abstract

The invention relates to a negative electrode for electroreduction of carbon dioxide and a preparation method thereof. The negative electrode is such structured that carbon paper, carbon felt or carbon cloth is used as a substrate; one side surface of the substrate is successively bonded with two catalysis layers of different pore sizes; and the negative electrode is successively composed of the substrate, a large-size heteroatom-doped nanocarbon layer and a small-size metal-and-heteroatom-doped nanocarbon layer. The large-size catalysis layer is favorable for transmission of CO2 and productsand reduction of mass transfer resistance; and the small-size heteroatom-doped nanocarbon layer is beneficial for improving the reaction active specific surface area of a catalyst and enhancing the reaction activity of the catalyst. As the negative electrode with such a structure is applied to ERC, the area of a three-phase electrochemical reaction interface is greatly broadened, the utilization rate of the catalyst is increased, and mass transfer polarization of an electrolytic bath is reduced; and in virtue of adsorptivity or formation of chemical bonds between the negative electrode and products of electroreduction of carbon dioxide, the selectivity and conversion rate of an assigned reduction product can be improved, and high selectivity of the reduction product is realized.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide electroreduction (ERC), in particular to a carbon dioxide electroreduction cathode material. Background technique [0002] In recent years, with the rapid development of renewable energy technologies, the cost of power generation is expected to drop significantly. If CO 2 Combining the effective conversion of carbon dioxide with renewable energy technology, it converts carbon dioxide into organic chemicals and realizes the conversion of electrical energy into chemical energy, which not only makes CO 2 The conversion technology is more economical, and can also form a closed cycle of carbon and energy conversion cycle, so that CO 2 be used effectively. Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 Reduction to various organic chemicals to achieve CO 2 A technology for resource utilization. with other COs 2 Compared with the conversion tech...

Claims

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Application Information

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IPC IPC(8): C25B11/12C25B11/06C25B3/04C25B3/25
CPCC25B3/25C25B11/055C25B11/091
Inventor 钟和香张华民邱艳玲李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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