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Carbon dioxide electroreduction cathode and preparation method thereof

A carbon dioxide, cathode technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve problems such as inapplicability, achieve the effect of improving selectivity and activity, reducing mass transfer resistance, and increasing specific surface area

Active Publication Date: 2019-06-18
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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  • Carbon dioxide electroreduction cathode and preparation method thereof
  • Carbon dioxide electroreduction cathode and preparation method thereof
  • Carbon dioxide electroreduction cathode 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 Purge at 850°C for 1 hour to obtain nanoparticle / carbon composites, then remove calcium carbonate with an appropriate amount of 2M dilute hydrochloric acid, filter and then vacuum dry at 80°C for 24 hours to obtain the macroporous nitrogen-doped nanocarbon material.

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

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 Purge at 850°C for 1 hour to obtain nanoparticle / carbon composites, then remove calcium carbonate with an appropriate amount of 2M dilute hydrochloric acid, filter and then vacuum dry at 80°C for 24 hours 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 the stirring soluti...

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 and become transparent, 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 by carbonization at 900°C for 2h to obtain the nanoparticle / carbon composite, then remove nano-alumina with an appropriate amount of 2M dilute hydrochloric acid, and vacuum dry at 80°C for 24h after filtration to obtain the P-doped macroporous carbon material (phosphorus content 0.9%).

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

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Abstract

The invention relates to a carbon dioxide electroreduction cathode and a preparation method thereof. The cathode structure is based on carbon paper, carbon felt or carbon cloth, and two catalyst layers with different pore diameters are sequentially attached to one side of the substrate. The substrate, the nano-carbon layer doped with large-aperture heteroatoms, the metal with small-aperture and the nano-carbon layer doped with heteroatoms are in sequence. Catalyst layer with large pore size is beneficial for CO 2 Transmission and product transmission, reduce mass transfer resistance; heteroatom-doped nano-carbon layer with small pore size is beneficial to increase catalyst reactivity specific surface area, improve reactivity; apply this structure to ERC, greatly expand the three-phase The area of ​​the electrochemical reaction interface improves the utilization rate of the catalyst, which is beneficial to reduce the mass transfer polarization of the electrolytic cell, and utilizes its interaction with CO 2 Adsorptivity or chemical bond formation between electroreduction products increases the selectivity and conversion rate of specified reduction products, and achieves the goal of high selectivity for reduction products.

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 conversion technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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