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
6 Cites 10 Cited by

AI-Extracted 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...
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Method used

Fig. 8 and Fig. 9 are respectively the linear sweep voltammetry curve and the half-wave potential diagram of electrocatalyst prepared in embodiment 4 and commercial Pt/C electrocatalyst modified electrode, as can be seen from Fig. 8 and Fig. 9, The catalytic activity of the electrocatalyst obtained in Example 4 is comparable to that of commercial Pt/C, its limiting current density and half-wave potential are better than those of commercial Pt/C, and its cycle stability is significantly better than that of commercial Pt/C. Non-precious metal electrocatalysts to replace commercial Pt/C are of great significance to promote the development of fuel cells and metal-air batteries. In addition, it is found from the research that our transition metal/nitrogen-doped porous carbon nanosphere electrocatalyst has good methanol tolerance.
In a specific embodiment, nitrogen element and carbon element are in the ortho position in the periodic table of elements, and its atomic radius is close to the radius of carbon atom, so the doping of nitrogen element has less influence on the lattice distortion of carbon material . Adding a certain amount of nitrogen to the porous carbon material will, on the one hand, increase the surface charge density of the porous carbon material, and increase the defect sites of the porous carbon material, thereby enhancing the activity in electrochemical or electrocatalytic reactions. On the other hand, the nitrogen functional group of the porous carbon material makes it easier for the porous carbon material to combine with heavy metal ions, thereby facilitating the metal ions to disperse more uniformly on the surface of the carbon material in subsequent steps. However, excessive nitrogen source disturbs the assembly process of γ-cyclodextrin and triblock copolymer F127, leading to self-polymerization or polycondensation of the precursor solution. In a specific embodiment, when the molar ratio of γ-cyclodextrin to p-phenylenediamine is 1:1-4:1, a transition met...
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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.

Application Domain

Fuel and primary cellsCell electrodes

Technology Topic

ChemistryEtching +15

Image

  • 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

Examples

  • Experimental program(7)
  • Effect test(1)

Example Embodiment

[0052] Example 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.

Example Embodiment

[0056] Example 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 porous carbon nanospheres.

Example Embodiment

[0060] Example 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-doped porous carbon nanospheres.
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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Large specific surface area
  • High catalytic activity
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