A kind of method of hydrothermal synthesis cu-n-c catalyst

A catalyst, hydrothermal technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of incomplete four-electron transfer, low ORR activity, etc., and achieve tunable catalytic performance, simple preparation process, and high ORR activity. and stability effects

Active Publication Date: 2019-02-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these carbon-based catalysts all exhibit good ORR activities, their ORR activities are all limited by the 2 / 2 electron mechanism, that is, the former two-electron transfer (oxygen is reduced to hydrogen peroxide) is more important than the latter two-electron transfer ( Peroxide reduction to water) is faster, resulting in an incomplete four-electron transfer (oxygen is reduced to water) (Journal of Materials Chemistry A, 2013, 1(42): 13179-13185. )
In order to solve the problem of low ORR activity caused by the two-electron transfer of metal-free carbon-based catalysts, transition metals such as iron (Fe), cobalt (Co), and manganese (Mn) were incorporated into carbon materials to make carbon-based catalysts achieve four-electron transfer, which improves the ORR activity; but so far, the catalytic performance of carbon-based catalysts is still far behind that of platinum (Pt)-based catalysts; therefore, it is still challenging to explore high-performance carbon-based catalysts.

Method used

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  • A kind of method of hydrothermal synthesis cu-n-c catalyst
  • A kind of method of hydrothermal synthesis cu-n-c catalyst
  • A kind of method of hydrothermal synthesis cu-n-c catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) First, grind the copper block with a purity of 99.99% into copper powder with a particle size of 10-50 μm, then weigh 30 mg of copper powder and put it into a 20 mL glass bottle, then add 15 mL of ammonia (NH 3 ) ammonia water with a concentration of 25%, until the colorless transparent liquid in the glass bottle turns into a light blue liquid; seal the light blue liquid and put it in the refrigerator at 4°C, after 4 days, the light blue The liquid becomes a colorless and transparent liquid again. After removing the copper residue in the colorless and transparent liquid in a glove box under anaerobic conditions, Cu[NH] containing monovalent copper ions (Cu(I)) is obtained. 3 ] 2 OH is a colorless transparent liquid, called Cu(I) liquid;

[0026] (2) Take 100mg of graphene oxide and prepare 20mL of graphene oxide distilled solution with a concentration of 5mg / mL (ultrasound for 30min), mix it with the Cu(I) liquid in step (1) and put it into a Teflon-lined container...

Embodiment 2

[0029] (1) First, grind the copper block with a purity of 99.99% into copper powder with a particle size of 50-100 μm, then weigh 22.5 mg of copper powder and put it into a 20 mL glass bottle, then add 15 mL of ammonia (NH 3) content of 30% ammonia water, until the colorless transparent liquid in the glass bottle turns into a light blue liquid. Put the light blue liquid into a refrigerator at 4°C after sealing it well, and after standing for 3 days, the light blue liquid becomes a colorless and transparent liquid again. After removing copper residues in a colorless transparent liquid in a glove box under anaerobic conditions, Cu[NH] containing monovalent copper ions (Cu(I)) 3 ] 2 OH is a colorless and transparent liquid, called Cu(I) liquid; Cu(I) liquid is placed in the air for 10 minutes, and after the colorless and transparent liquid turns blue, the solution containing divalent copper ions (Cu(II) ) Cu[NH 3 ] 4 (OH) 2 Light blue liquid, called Cu(II) liquid;

[0030] ...

Embodiment 3

[0032] (1) First, grind the copper block with a purity of 99.99% into copper powder with a particle size of 10-100 μm, then weigh 20 mg of copper powder and put it into a 20 mL glass bottle, then add 15 mL of ammonia (NH 3 ) ammonia water with a content of 15%, the colorless transparent liquid in the glass bottle turns into a light blue liquid; after sealing the light blue liquid, put it in the refrigerator at 10°C, and after 3 days, the light blue The liquid becomes a colorless and transparent liquid again; after removing the copper residue in the colorless and transparent liquid in a glove box under anaerobic conditions, Cu[NH] containing monovalent copper ions (Cu(I)) is obtained 3 ] 2 OH is a colorless transparent liquid, called Cu(I) liquid;

[0033] (2) Take 30 mL of graphene oxide nanoribbon distilled aqueous solution (prepared by ultrasonication for 40 min) with a concentration of 1 mg / mL, mix it with the Cu(I) liquid in step (1), and put it into a stainless steel hig...

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Abstract

The invention relates to a synthesis method for a Cu-N-C catalyst by a hydrothermal method, and belongs to the technical field of a new energy material. According to the synthesis method, high-purity copper powder is added to ammonium hydroxide to obtain a copper ammonia coordination compound solution through a chemical reaction; next, a copper ammonia solution is mixed with a carbon oxide nanomaterial; and by virtue of a flocculation phenomenon generated by the electrostatic interaction between a copper ammonia coordination compound and the carbon oxide nanomaterial, the copper ammonia coordination compound is tightly attached to the periphery of the carbon oxide nanomaterial to form a copper ammonia coordination compound-graphene oxide complex. The carbon-based catalyst disclosed by the invention is synthesized at a relatively low temperature, so that high-temperature pyrolysis is not required; and in addition, the synthesized Cu-N-C carbon-based catalyst has relatively high ORR activity and stability and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for synthesizing a high-performance Cu-N-C catalyst by a hydrothermal method, belonging to the technical field of new energy materials. Background technique [0002] Fuel cells are regarded as one of the effective tools to deal with global environmental and energy problems, and the main content of current research focuses on improving energy conversion efficiency. At present, platinum (Pt)-based catalysts are mainly used for fuel cell cathode oxygen reduction reaction (ORR), but Pt resources are scarce and expensive. Therefore, the cost problem is the main reason for limiting the commercialization of fuel cells, and the development of low-cost, high ORR activity and high stability cathode catalysts is of great significance to promote the commercialization of fuel cells. [0003] In recent years, heteroatom-doped carbon materials have been investigated as effective metal-free ORR electrocatalysts, especially nitrogen (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/96
CPCH01M4/88H01M4/96Y02E60/50
Inventor 杨喜昆李卫张晋谭丰闵春刚
Owner KUNMING UNIV OF SCI & TECH
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