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Preparation method and application of cobalt-loaded porous carbon composite graphene electrocatalyst

A composite graphene and electrocatalyst technology, which is applied in the direction of fuel cell half-cells and primary battery half-cells, circuits, electrical components, etc., can solve the problems of high cost, high price, and scarce precious metals

Active Publication Date: 2020-10-20
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the oxygen reduction reaction (ORR) is a common cathode reaction in fuel cells and metal-air batteries. Considering the activity and stability of the catalyst, the catalysts used for the oxygen reduction reaction (ORR) mainly include Pt and its alloys, but these Precious metals are very rare in nature and expensive, leading to high costs

Method used

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  • Preparation method and application of cobalt-loaded porous carbon composite graphene electrocatalyst
  • Preparation method and application of cobalt-loaded porous carbon composite graphene electrocatalyst
  • Preparation method and application of cobalt-loaded porous carbon composite graphene electrocatalyst

Examples

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Effect test

Embodiment 1

[0032] A preparation process of a cobalt-loaded porous carbon composite graphene electrocatalyst is as follows:

[0033] (1) Cobalt nitrate hexahydrate (1.0g), gluconic acid (6.0ml) and deionized water (30.0ml) were mixed and magnetically stirred for 8 hours, then graphene oxide (0.3g) was added, followed by ultrasonic treatment for 30 minutes, get mixed solution;

[0034] (2) Transfer all the mixed solution to a 50ml autoclave, seal the lid and heat it to 100°C for 10 hours to react for 10 hours. After the reaction, naturally cool to room temperature, centrifuge, and then wash with deionized water. Dry at ℃ for 1 hour to obtain a cobalt-loaded graphene / carbon material (0.32g);

[0035] (3) Mix urea (0.8g), toluene (40.0ml) and 0.32g of cobalt-loaded graphene / carbon material prepared in the above step (2) and heat the reaction at 90°C for 4 hours, then cool to room temperature naturally after the reaction , and then pressurize to remove excess ethanol, followed by drying at ...

Embodiment 2

[0038] A preparation process of a cobalt-loaded porous carbon composite graphene electrocatalyst is as follows:

[0039] (1) Mix cobalt chloride hexahydrate (1.5g), L-cystine (5.0ml) and deionized water (30.0ml) and magnetically stir for 8 hours, then add graphene oxide (0.35g), and then ultrasonic Processed for 10 minutes to obtain a mixed solution;

[0040] (2) Transfer all the mixed solution to a 50ml autoclave, seal the lid and heat to 90°C for 8 hours to react. After the reaction, cool to room temperature naturally, centrifuge, and then wash with deionized water. Drying at ℃ for 2 hours gave a cobalt-loaded graphene / carbon material (0.38g);

[0041] (3) Melamine (0.65g), N,N-dimethylformamide (22.0ml) and the 0.38g cobalt-loaded graphene / carbon material prepared in the above step (2) were mixed and heated at 100°C for reaction 3 Hours, after the reaction, naturally cool to room temperature, then pressurize to remove excess N,N-dimethylformamide, and then dry at 80°C for...

Embodiment 3

[0044] A preparation process of a cobalt-loaded porous carbon composite graphene electrocatalyst is as follows:

[0045] (1) Cobalt hydroxide (2.0g), L-citrulline (2.0ml) and deionized water (20.0ml) were mixed and magnetically stirred for 8 hours, then graphene oxide (0.4g) was added, and then sonicated for 40 Minutes to obtain the mixed solution;

[0046] (2) Transfer all the mixed solution to a 50ml autoclave, seal the lid and heat it to 80°C for 12 hours. After the reaction, cool it down to room temperature, centrifuge, wash with methanol, and put it under 80°C after washing. Dry 3 hours, obtain the graphene / carbon material (0.43g) of loading cobalt;

[0047] (3) thiourea (0.7g), tetrahydrofuran (14.0ml) and the 0.43g cobalt-loaded graphene / carbon material prepared in the above step (2) were mixed and heated at 60°C for 5 hours, and naturally cooled to Room temperature, then pressurize to remove excess tetrahydrofuran, then dry at 65°C for 2 hours to obtain the pre-produ...

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Abstract

The invention discloses a preparation method and application of a cobalt-loaded porous carbon composite graphene electrocatalyst. The preparation method comprises the following steps: (1) mixing and stirring cobalt salt, a carbon source and deionized water, adding graphene oxide, and carrying out ultrasonic treatment to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle for heating reaction, and cooling, centrifuging, washing and drying after the reaction to obtain a cobalt-loaded graphene / carbon material; (3) mixing and reacting a nitrogen-containing organic matter, an organic solvent and the cobalt-loaded graphene / carbon material, cooling, removing the organic solvent, and drying to obtain a pre-product; and (4) under the protection of inert gas, heatingand calcining the pre-product, and cooling to obtain the cobalt-loaded porous carbon composite graphene electrocatalyst. The electrocatalyst is applied to a zinc-air battery. The preparation method issimple and low in cost. The prepared electrocatalyst is excellent in catalytic performance and good in repeatability, and the open-circuit voltage of the battery can be greatly improved when the electrocatalyst is applied to the zinc-air battery.

Description

technical field [0001] The invention relates to the technical field of new energy materials and electrochemical catalysis, in particular to a preparation method and application of a cobalt-loaded porous carbon composite graphene electrocatalyst. Background technique [0002] With the continuous development of society, the increasing energy demand of human beings has led to the rapid consumption of fossil fuels. At the same time, the pollution caused by the combustion of fossil fuels has led to serious global environmental problems. In order to alleviate the serious dependence of human beings on natural resources , the exploration of clean and renewable energy technologies is particularly urgent. Therefore, scientists have devoted a lot of energy to the research and development of efficient, low-cost and environment-friendly energy conversion and storage systems. Among them, the oxygen reduction reaction (ORR) is a common cathode reaction in fuel cells and metal-air batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/9041H01M4/9083H01M12/06
Inventor 贾海浪赵姣顾磊孙选龙彭智杰关明云庄严
Owner JIANGSU UNIV OF TECH
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