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Preparation method of nitrogen-doped carbon microsphere supported platinum composite catalyst for DMFC (direct methanol fuel cell)

A methanol fuel cell and composite catalyst technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of restricting large-scale commercial application, high price, low catalytic stability and durability, etc. Effects of stability and catalytic activity, improved electrical conductivity, high specific surface area

Inactive Publication Date: 2018-08-24
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, metallic platinum on expensive supported carbon materials is still the most widely used anode catalyst in methanol fuel cells, however, its low catalytic stability and durability restrict its large-scale commercial application

Method used

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  • Preparation method of nitrogen-doped carbon microsphere supported platinum composite catalyst for DMFC (direct methanol fuel cell)
  • Preparation method of nitrogen-doped carbon microsphere supported platinum composite catalyst for DMFC (direct methanol fuel cell)
  • Preparation method of nitrogen-doped carbon microsphere supported platinum composite catalyst for DMFC (direct methanol fuel cell)

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Embodiment 1

[0033] A method for preparing a nitrogen-doped carbon microsphere-supported platinum composite catalyst for a direct methanol fuel cell, characterized in that it specifically includes the following steps:

[0034] (1) Add 2g of maltitol and 1g of melamine to 20mL of deionized water and stir for 20 minutes to obtain a suspension;

[0035] (2) Take 8 mL of concentrated sulfuric acid with a mass percentage of 98% and add it dropwise to the suspension to become a clear solution, then perform a high-temperature hydrothermal reaction, and the obtained carbon airgel is filtered and washed, and then dried at 60°C for 12 Hours; Wherein, the temperature of high-temperature hydrothermal reaction is 180 ℃, and reaction time is 12 hours;

[0036] (3) The powder obtained by drying in step (2) is roasted at a high temperature under an inert gas atmosphere, specifically heated to 800 °C at a heating rate of 5 °C / min, and kept at a constant temperature for 2 hours. After roasting, it is acid-w...

Embodiment 2

[0040] A method for preparing a nitrogen-doped carbon microsphere-supported platinum composite catalyst for a direct methanol fuel cell, characterized in that it specifically includes the following steps:

[0041] (1) Add 1g of maltitol and 1.5g of melamine into 30mL of deionized water and stir for 20 minutes to obtain a suspension;

[0042](2) Take 10mL of concentrated sulfuric acid with a mass percentage of 98% and add it dropwise to the suspension to become a clear solution, then perform a high-temperature hydrothermal reaction, and the obtained carbon airgel is filtered and washed, and then dried at 60°C for 12 Hours; Wherein, the temperature of high-temperature hydrothermal reaction is 190 ℃, and reaction time is 10 hours;

[0043] (3) The powder obtained by drying in step (2) is roasted at high temperature under an inert gas atmosphere. Specifically, after heating to 600 °C at a heating rate of 10 °C / min, it is roasted at a constant temperature for 3 hours. After roastin...

Embodiment 3

[0047] A method for preparing a nitrogen-doped carbon microsphere-supported platinum composite catalyst for a direct methanol fuel cell, characterized in that it specifically includes the following steps:

[0048] (1) Add 1.5g maltitol and 1.5g melamine to 25mL deionized water and stir for 20 minutes to obtain a suspension;

[0049] (2) Take 5 mL of concentrated sulfuric acid with a mass percentage of 98% and add it dropwise to the suspension to become a clear solution, then perform a high-temperature hydrothermal reaction, and the obtained carbon airgel is filtered and washed, and then dried at 60°C for 12 Hours; Wherein, the temperature of high-temperature hydrothermal reaction is 200 ℃, and reaction time is 18 hours;

[0050] (3) The powder obtained by drying in step (2) is roasted at high temperature under an inert gas atmosphere. Specifically, after heating to 700°C at a heating rate of 2°C / min, keep roasting at a constant temperature for 1.5 hours, and after roasting, pi...

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Abstract

The invention discloses a preparation method of a nitrogen-doped carbon microsphere supported platinum composite catalyst for a DMFC (direct methanol fuel cell). The preparation method comprises stepsas follows: firstly, maltitol and melamine are taken as a carbon source and a nitrogen source respectively, concentrated sulfuric acid is taken as a solvent, the raw materials are subjected to hydro-thermal treatment and then subjected to high-temperature calcination in inert gas atmosphere, nitrogen-doped carbon microspheres are obtained, and the nitrogen-doped carbon microsphere supported platinum composite catalyst is obtained with a microwave-assisted glycol thermal reduction process. According to the preparation method, maltitol is taken as the carbon source, melamine is taken as the nitrogen source, the raw material cost is low, insolubility of melamine is improved by addition of concentrated sulfuric acid, and mixing uniformity of the raw materials is improved; nitrogen enters lattices of carbon, conductivity of carbon is improved, and binding force of platinum and the catalyst is improved under synergistic effect of carbon and nitrogen; the generated nitrogen-doped carbon microspheres have uniform surfaces and higher specific surface area, distribution uniformity of platinum on the surface of the carrier is improved, and stability and catalytic activity of the composite catalyst are improved.

Description

technical field [0001] The invention relates to the field of carbon materials and electrode catalytic materials, in particular to a method for preparing a platinum composite catalyst supported by nitrogen-doped carbon microspheres for direct methanol fuel cells. Background technique [0002] Due to the increasing depletion of non-renewable resources and the highlight of environmental problems, people are forced to look for low-cost, green and environmentally friendly renewable energy conversion devices to maintain sustainable economic and social development. Direct methanol fuel cells have attracted attention as an ideal chemical power source due to their high capacity density, low temperature performance, low pollution emissions and simple structure. So far, metallic platinum on expensive supported carbon materials is still the most widely used anode catalyst in methanol fuel cells, however, its low catalytic stability and durability restrict its large-scale commercial appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1011
CPCH01M4/926H01M8/1011Y02E60/50
Inventor 赵宣朱庆俊姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD