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Cu2O/N-C oxygen reduction catalyst and preparation and application thereof

A catalyst, cuprous oxide technology, applied in the field of material chemistry, can solve the problems of poor stability of metal nitrogen carbon materials, damage to battery materials and devices, shortage of metal platinum resources, etc., achieve excellent stability, solve poor stability, and improve electrochemical performance effect

Active Publication Date: 2020-12-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the development of aluminum-metal-air batteries is mainly limited by the oxygen reduction reaction of its cathode air. The oxygen reduction reaction is a process with slow kinetics. At present, the catalysts that are more commercially dependent are platinum-based catalysts, but metal platinum resources are in short supply. It is expensive, so it is one of the problems to be solved urgently to develop an efficient and cheap non-platinum oxygen reduction catalyst
[0003] In recent years, the non-platinum catalysts that have been widely studied are metal nitrogen carbon catalysts. [1-3] , the oxygen reduction active sites of metal nitrogen carbon materials are Me-N groups embedded in carbon, nitrogen-doped carbon-coated metal groups, nitrogen-doped carbon groups, etc. [4] , although the metal nitrogen carbon catalyst has excellent oxygen reduction performance, the study found that the stability of the metal nitrogen carbon material is poor. During the working process, the active substance will continue to dissolve and generate H 2 o 2 , damage battery materials and devices

Method used

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  • Cu2O/N-C oxygen reduction catalyst and preparation and application thereof
  • Cu2O/N-C oxygen reduction catalyst and preparation and application thereof
  • Cu2O/N-C oxygen reduction catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] First weigh 2.30g of 2-methylimidazole (28mmoL) and 20mg of CuPC (copper phthalocyanine, 0.035mmoL) and dissolve them in 40ml of methanol, stir until completely dissolved, and weigh 1.00g of Zn(NO 3 ) 2 ·6H 2 O (3.6mmoL) was dissolved in another 40ml of methanol, stirred until completely dissolved, Zn(NO 3 ) 2 ·6H 2 O methanol solution was slowly added to 2-methylimidazole and 20mg CuPC methanol solution, stirred at 30°C at 500-550rmp for 24h, centrifuged at 5000rmp for 5min, washed twice with methanol, and placed in an oven at 80°C Dry in medium. Put the dried samples into a porcelain boat, 2 The above samples were sintered at high temperature in the atmosphere, the heating rate was 10°C / min, the temperature was controlled at 800°C, and the holding time was 3h. The sample obtained by the above steps is named Cu 2 O / N-C-1.

[0065] Adopt X-ray diffractometer (XRD, Rigaku-D / Max 2550, Cu-Kα, 40kV, 300mA) to carry out phase analysis to the product. The morphology ...

Embodiment 2

[0068] Compared with Example 1, the difference is that the consumption of CuPC is reduced, specifically as follows:

[0069] First weigh 2.30g of 2-methylimidazole and 16mg of CuPC (0.028mmoL) and dissolve them in 40ml of methanol, stir until completely dissolved, and weigh 1.00g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in another 40ml of methanol, stirred until completely dissolved, Zn(NO 3 ) 2 ·6H 2 O methanol solution was slowly added to 2-methylimidazole and 16mg CuPC methanol solution, stirred at 30°C at 500-550rmp for 24h, centrifuged at 5000rmp for 5min, washed twice with methanol, and placed in an oven at 80°C Dry in medium. Put the dried samples into a porcelain boat, 2 The above samples were sintered at high temperature in the atmosphere, the heating rate was 10°C / min, the temperature was controlled at 800°C, and the holding time was 3h. The sample obtained by the above steps is named Cu 2 O / N-C-2.

[0070] The ORR performance test of the material and the prepar...

Embodiment 3

[0072] Compared with Example 1, the difference is that the consumption of CuPC is increased, specifically as follows:

[0073] First weigh 2.30g of 2-methylimidazole and 26mg of CuPC (0.046mmoL) and dissolve them in 40ml of methanol, stir until completely dissolved, and weigh 1.00g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in another 40ml of methanol, stirred until completely dissolved, Zn(NO 3 ) 2·6H 2 O methanol solution was slowly added to 2-methylimidazole and 26mg CuPC methanol solution, stirred at 500-550rmp at 30°C for 24h, centrifuged at 5000rmp for 5min, washed twice with methanol, and placed in an oven at 80°C Dry in medium. Put the dried samples into a porcelain boat, 2 The above samples were sintered at high temperature in the atmosphere, the heating rate was 10°C / min, the temperature was controlled at 800°C, and the holding time was 3h. The sample obtained by the above steps is named Cu 2 O / N-C-3.

[0074] The ORR performance test of the material and the prepa...

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Abstract

The invention discloses a Cu2O / N-C oxygen reduction catalyst and preparation and application thereof. The preparation method of the catalyst comprises the steps that a certain amount of zinc salt anda carbon source are dissolved in an organic solvent, a copper source is added, the Cu2O / N-C oxygen reduction catalyst is obtained through pyrolysis, and the amount of generated cuprous oxide is regulated and controlled by adjusting the amount of the added copper source in an experiment. The method is simple and high in repeatability. The catalyst is a composite material of cuprous oxide and nitrogen-doped carbon, the cuprous oxide is an active site for oxygen reduction catalysis, and the nitrogen-doped carbon can improve the conductivity of the material, so that the material has relatively high current density. The prepared optimal material is used as an oxygen reduction catalyst of an aluminum-air battery, the oxygen reduction half-wave potential is 0.8V, and the limiting current densityis 4.6mA / cm<2>.

Description

technical field [0001] The invention relates to the field of material chemistry and the field of electrocatalysis technology, in particular to a Cu 2 O / N-C oxygen reduction catalyst and its preparation method and application. Background technique [0002] With the deteriorating global environment and the increasing shortage of fossil energy, people are deeply aware that the development of new clean energy is imminent. Aluminum-metal-air batteries have high energy density (theoretically up to 8131Wh / kg Al and ~21,954Wh / L Al ), rich reserves, low cost, good safety and other advantages are considered to be a new generation of energy storage batteries with great potential. At present, the development of aluminum-metal-air batteries is mainly limited by the oxygen reduction reaction of its cathode air. The oxygen reduction reaction is a process with slow kinetics. At present, the catalysts that are more commercially dependent are platinum-based catalysts, but metal platinum res...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08B82Y30/00B82Y40/00
CPCH01M4/9016H01M4/9083H01M12/08B82Y30/00B82Y40/00Y02E60/50
Inventor 唐有根田敬王海燕李静莎刘德培
Owner CENT SOUTH UNIV
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