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Transition metal/nitrogen-doped porous carbon nanosphere electrocatalyst and preparation method thereof

A nitrogen-doped porous carbon and transition metal technology, which can be used in fuel cell type half cells and primary cell type half cells, circuits, electrical components, etc. The nitrogen process is complex and other problems, to achieve the effect of improving catalytic activity, improving catalytic efficiency, and large specific surface area

Active Publication Date: 2020-03-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a transition metal / nitrogen-doped porous carbon nanosphere electrocatalyst, aiming at solving the need for acid-base etching to remove the template in the existing preparation method. , the nitrogen doping process is complicated and the nitrogen content cannot be adjusted, the preparation process is complicated, the cost is high, and it is difficult to commercialize the problem

Method used

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  • Transition metal/nitrogen-doped porous carbon nanosphere electrocatalyst and preparation method thereof
  • Transition metal/nitrogen-doped porous carbon nanosphere electrocatalyst and preparation method thereof
  • Transition metal/nitrogen-doped porous carbon nanosphere electrocatalyst and preparation method thereof

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Effect test

Embodiment 1

[0053] (1) Dissolve 0.125g of F127 in 120ml of deionized water, stir magnetically at room temperature for 4 hours until completely dissolved; dissolve 1g of γ-cyclodextrin in the above solution, stir for 0.5h until completely dissolved, and continue stirring overnight to form a uniform and stable The precursor solution;

[0054] (2) Put the above precursor solution into a 200ml reaction kettle, heat it with constant temperature water at 220°C for 6 hours, filter / centrifuge the product after cooling, and wash the obtained product repeatedly with deionized water for 3 times, and then place the product in Dry at 60°C for 12 hours to obtain 0.2 g of brown carbon nanosphere powder;

[0055] (3) The above-mentioned brown carbon nanosphere powder was placed in a tube furnace, and the temperature was raised to 900° C. in an Ar atmosphere at a heating rate of 5° C. / min, kept for 2 hours, and then cooled with the furnace to obtain porous carbon nanospheres.

Embodiment 2

[0057] (1) Dissolve 0.125g of F127 in 120ml of deionized water, stir magnetically at room temperature for 4 hours until completely dissolved; dissolve 1g of γ-cyclodextrin in the above solution, stir for 0.5h until completely dissolved, then add 0.0833g of p-phenylenediamine, Continue to stir overnight to form a uniform and stable precursor solution;

[0058] (2) Put the above precursor solution into a 200ml reaction kettle, heat it with constant temperature water at 220°C for 6 hours, filter / centrifuge the product after cooling, and wash the obtained product repeatedly with deionized water for 3 times, and then place the product in Dry at 60° C. for 12 hours to obtain 0.33 g of brown nitrogen-doped carbon nanosphere powder;

[0059] (3) Put the above-mentioned brown nitrogen-doped carbon nanosphere powder in a tube furnace, raise the temperature to 900°C at a rate of 5°C / min in an Ar atmosphere, keep it warm for 2 hours, and then cool with the furnace to obtain nitrogen-doped...

Embodiment 3

[0061] (1) Dissolve 0.125g of F127 in 120ml of deionized water, stir magnetically at room temperature for 4 hours until completely dissolved; dissolve 1g of γ-cyclodextrin in the above solution, stir for 0.5h until completely dissolved, then add 0.1667g of p-phenylenediamine, Continue to stir overnight to form a uniform and stable precursor solution;

[0062] (2) Put the above precursor solution into a 200ml reaction kettle, heat it with constant temperature water at 220°C for 6 hours, filter / centrifuge the product after cooling, and wash the obtained product repeatedly with deionized water for 3 times, and then place the product in Dry at 60°C for 12 hours to obtain 0.45 g of brown nitrogen-doped carbon nanosphere powder;

[0063] (3) Put the above-mentioned brown nitrogen-doped carbon nanosphere powder in a tube furnace, raise the temperature to 900°C at a heating rate of 5°C / min in an argon atmosphere, keep it for 2 hours, and then cool with the furnace to obtain nitrogen-d...

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Abstract

The invention discloses a transition metal / nitrogen-doped porous carbon nanosphere electrocatalyst and a preparation method thereof.The method comprises the steps that a precursor solution composed ofa template agent, a carbon source and a nitrogen source is placed in a reaction kettle, and nitrogen-doped carbon nanosphere powder is obtained under the heating condition; carrying out ultrasonic treatment on the nitrogen-doped carbon nanospheres and a transition metal salt solution and then carrying out vacuum drying to obtain transition metal / nitrogen-doped carbon nanosphere powder; and carbonizing the transition metal / nitrogen-doped carbon nanosphere powder in inert gas to obtain the transition metal / nitrogen-doped porous carbon nanosphere electrocatalyst. According to the preparation method disclosed by the invention, the content of the transition metal adsorbed by the nitrogen-doped carbon nanospheres can be adjusted by adjusting the content of the nitrogen source, so that the catalytic activity of the electrocatalyst is effectively improved. The template agent is decomposed at a high temperature, acid-base etching is not needed to remove the template, and the prepared electrocatalyst has a large specific surface area, is beneficial to adsorption and catalytic reaction, and greatly improves the catalytic efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical energy materials, in particular to a transition metal / nitrogen-doped porous carbon nanosphere electrocatalyst and a preparation method. Background technique [0002] With the depletion of traditional fossil fuels and the destruction of the environment by burning fossil fuels and chemical industries, the energy crisis and environmental pollution have become the biggest challenges facing mankind today. Research and development of new clean energy and devices is urgent. Among many new energy conversion and storage devices, fuel cells and metal-air batteries have been widely studied due to their high conversion efficiency and low emissions. However, the oxygen reduction reaction at the cathode has become the main factor limiting the power of the battery due to its slow kinetics. It usually requires the presence of an electrocatalyst to improve the reaction efficiency. The currently commercialized oxy...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/9041H01M4/9075H01M12/06
Inventor 姚蕾陈媛媛杨海涛李秀娟陈鸿江黎芷彤韦可研
Owner SHENZHEN UNIV
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