Nitrogen-doped porous carbon-coated metal nano composite catalyst and preparation method thereof

A nitrogen-doped porous carbon, composite catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of uncontrollable growth of metal particles, decreased catalytic activity, and metal particle dispersion The core and the graphitized carbon layer electrons interact with the active site density of the catalyst to achieve excellent ORR electrocatalytic performance, solve the effect of low ORR activity and excellent catalytic activity.

Active Publication Date: 2020-04-17
FOSHAN POLYTECHNIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such coated catalysts reported in the current literature have the following problems: 1) the agglomeration of metal particles during the high-temperature pyrolysis process leads to uneven dispersion of metal particles, and the particle size is relatively large, ranging from tens to hundreds of nanometers; 2 ) The metal loading is low, usually lower than 10%; 3) Some metal particles are not completely coated, and the uneven dispers

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  • Nitrogen-doped porous carbon-coated metal nano composite catalyst and preparation method thereof
  • Nitrogen-doped porous carbon-coated metal nano composite catalyst and preparation method thereof
  • Nitrogen-doped porous carbon-coated metal nano composite catalyst and preparation method thereof

Examples

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Embodiment 1

[0039] This example provides the first nitrogen-doped porous carbon-coated metal nanocomposite catalyst, the preparation method of which is as follows:

[0040] 1) Dissolve 2g LiF in 40ml hydrochloric acid solution and react for half an hour to obtain a solution; then, dissolve 2g Ti 3 AlC 2 Add it into solution a, and react with magnetic stirring in a water bath at 35°C for 24 hours, wash with deionized water and centrifuge, then use ethanol and deionized water to sonicate and centrifuge, and freeze-dry to obtain reactant 1, namely Ti 3 C 2 -MXene.

[0041] 2) Weigh the Ti obtained in the above step 1) 3 C 2 -Add MXene to deionized water and ethylene glycol and ultrasonically disperse evenly to obtain b solution; then, dissolve cobalt nitrate and urea in deionized water, and then slowly add to b solution, under nitrogen protection gas, in an oil bath The reaction was carried out under magnetic stirring at 100° C. for 5 hours, followed by washing, filtration and freeze-dr...

Embodiment 2

[0046] This example provides the second nitrogen-doped porous carbon-coated metal nanocomposite catalyst, the preparation method of which is as follows:

[0047] 1) Dissolve 2g NaF in 40ml hydrochloric acid solution and react for half an hour to obtain a solution; then, dissolve 2g Ti 3 AlC 2 Add it into solution a, and react with magnetic stirring for 48 hours under the condition of 30°C water bath, wash with deionized water and centrifuge, then use ethanol and deionized water to sonicate and centrifuge, freeze-dry to obtain reactant 1, namely Ti 3 C 2 -MXene.

[0048] 2) Weigh what is gained in the above-mentioned steps 1), i.e. Ti 3 C 2 -MXene was added to deionized water and N-methylpyrrolidone to ultrasonically disperse uniformly to obtain b solution; then, cobalt nitrate and urea were dissolved in deionized water, and then slowly added to b solution, under nitrogen protection gas, 60 °C in an oil bath with magnetic stirring for 20 hours, followed by washing, filtrat...

Embodiment 3

[0052] This example provides the third nitrogen-doped porous carbon-coated metal nanocomposite catalyst, the preparation method of which is as follows:

[0053] 1) Dissolve 2g KF in 40ml hydrochloric acid solution and react for half an hour to obtain a solution; then, dissolve 2g Ti 3 AlC 2 Add it into solution a, stir it with magnetic force for 1 hour under the condition of 80°C water bath, wash it with deionized water and centrifuge, then use ethanol and deionized water to sonicate and centrifuge, freeze-dry to obtain reactant 1, namely Ti 3 C 2 -MXene.

[0054] 2) Weigh what is gained in the above-mentioned steps 1), i.e. Ti 3 C 2 -MXene was added to deionized water and N-methylpyrrolidone for ultrasonic dispersion to obtain b solution; then, cobalt nitrate and urea were dissolved in deionized water, and then slowly added to b solution, under nitrogen protection gas, 200 °C in an oil bath with magnetic stirring for 1 hour, followed by washing, filtration and freeze-dry...

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Abstract

The invention discloses a nitrogen-doped porous carbon-coated metal nano composite catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) adding a fluoride into an acidic solution for reaction, then adding M<n+1>AX<n>, carrying out magnetic stirring reaction under a water bath condition, cleaning a product with deionized water, centrifuging, then sequentially carrying out ultrasonic cleaning and centrifuging with an organic solvent and deionized water, and carrying out freeze drying so as to obtain a reactant 1; 2) weighing a certain amount of thereactant 1, adding deionized water and an organic solvent, carrying out uniform ultrasonic dispersion, dissolving a transition metal salt and urea in deionized water, adding an obtained mixture in anobtained mixed solution of the reactant 1, and carrying out magnetic stirring reaction under an oil bath condition to obtain a reactant 2; 3) performing heat treatment on the reactant 2 and a nitrogen-containing compound in a high-temperature furnace to obtain a reactant 3; and 4) performing high-temperature reduction on the reactant 3 in a protective atmosphere to obtain the nitrogen-doped porouscarbon-coated metal nano composite catalyst. According to the preparation method, the problems that the oxygen reduction catalyst prepared in the prior art is easy to agglomerate and the ORR activityis reduced due to less exposure of active sites are solved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a nitrogen-doped porous carbon-coated metal nanocomposite catalyst and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. Its power generation process is not limited by the Carnot cycle, and the energy conversion efficiency is high. The theoretical efficiency is as high as 85-90%, and the actual efficiency is 40-60%. It is environmentally friendly and hardly emits air pollutants such as sulfur oxides and nitrogen oxides. With low noise and easy operation, it is considered to be the preferred clean energy in the 21st century. As an efficient and clean energy conversion technology, fuel cells will definitely play an irreplaceable role in the future non-fossil energy system. The catalysts...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/22H01M4/90
CPCB01J27/24B01J35/0033B01J35/0073B01J27/22H01M4/9041H01M4/9083Y02E60/50
Inventor 严亮
Owner FOSHAN POLYTECHNIC
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