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Preparation method of nitrogen-doped graphene catalyst

A nitrogen-doped graphene and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poisoning of catalytic reaction intermediates, poor stability, slow reduction reaction rate, etc., and achieve good catalytic performance without attenuation. The effect of stability

Inactive Publication Date: 2018-10-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxygen reduction reaction, a key reaction in fuel cells, is slow and requires Pt as a catalyst
However, the high cost of Pt, scarcity of resources, easy poisoning of catalytic reaction intermediate products (such as CO, etc.), and poor stability restrict the large-scale application of fuel cells.

Method used

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  • Preparation method of nitrogen-doped graphene catalyst
  • Preparation method of nitrogen-doped graphene catalyst
  • Preparation method of nitrogen-doped graphene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Take out the ball milling tank of the planetary ball mill, add zirconia beads of 1 / 3 volume of the ball milling tank, and continue to add 200 mesh natural flake graphite powder and melamine according to the ratio of 1:3 until the total volume of zirconia beads and powder reaches the total volume of the tank. The volume is 1 / 2, the ball mill jar is sealed, and the protective gas is poured into the ball mill jar until the pressure reaches 0.2MPa, and then the gas is released, and this is repeated five times. Then fill the ball mill jar with protective gas until the pressure reaches 2 MPa, close the air valve, and install the ball mill jar on the ball mill.

[0030] 2. Set the speed of the ball mill to 500rpm, start the ball mill, and run continuously for 48 hours. Open the air valve and sieve out the sample to obtain unreduced nitrogen-doped graphene.

[0031] 3. After the reaction, the unreacted nitrogen-doped graphene was taken out, soaked and washed with methanol f...

Embodiment 2

[0034] 1. Take out the ball milling tank of the planetary ball mill, add 1 / 3 volume of zirconia beads in the ball milling tank, and continue to add 200 mesh natural flake graphite powder and melamine in a ratio of 1:2 until the total volume of zirconia beads and powder reaches the total volume of the tank. The volume is 1 / 2, the ball mill jar is sealed, and the protective gas is poured into the ball mill jar until the pressure reaches 0.2MPa, and then the gas is released, and this is repeated five times. Then fill the ball mill jar with protective gas until the pressure reaches 2 MPa, close the air valve, and install the ball mill jar on the ball mill.

[0035] 2. Set the speed of the ball mill to 500rpm, start the ball mill, and run continuously for 48 hours. Open the air valve and sieve out the sample to obtain unreduced nitrogen-doped graphene.

[0036] 3. After the reaction, the nitrogen-doped graphene was taken out, soaked and washed with methanol for 2 hours, filtered a...

Embodiment 3

[0040] 1. Take out the ball milling tank of the planetary ball mill, add 1 / 3 volume of zirconia beads in the ball milling tank, and continue to add 200 mesh natural flake graphite powder and melamine in a ratio of 1:1 until the total volume of zirconia beads and powder reaches the total volume of the tank. The volume is 1 / 2, the ball mill jar is sealed, and the protective gas is poured into the ball mill jar until the pressure reaches 0.2MPa, and then the gas is released, and this is repeated five times. Then fill the ball mill jar with protective gas until the pressure reaches 2 MPa, close the air valve, and install the ball mill jar on the ball mill.

[0041] 2. Set the speed of the ball mill to 500rpm, start the ball mill, and run continuously for 48 hours. Open the air valve and sieve out the sample to obtain unreduced nitrogen-doped graphene.

[0042] 3. After the reaction, the unreacted nitrogen-doped graphene was taken out, soaked and washed with methanol for 2 hours, ...

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Abstract

A preparation method of a nitrogen-doped graphene catalyst belongs to the field of a carbon material. Graphite is stripped to form an edge functional graphene by a mechanochemical mode, meanwhile, a nitrogen-containing compound and a graphene sheet layer are combined, the nitrogen-doped graphene catalyst with very good electron transmission capability and high-efficiency oxygen-reduction active sites is prepared, and high-efficiency production of the high-efficiency oxygen-reduction catalyst on a large scale is achieved. The material can be applied to the electrocatalytic oxygen-reduction process and has important significance to low-cost production of a fuel cell.

Description

technical field [0001] The invention belongs to the field of carbon materials, and relates to a preparation method of a nitrogen-doped graphene catalyst, which is particularly suitable for highly efficient catalytic oxygen reduction reaction applications. Background technique [0002] In view of the serious shortage of traditional oil resources and the increasingly prominent environmental pollution caused by them, the development of new efficient and clean energy has become a national strategic demand. As a representative of clean energy conversion devices, fuel cells known for their zero pollution and high energy conversion efficiency have been extensively studied by relevant researchers all over the world. The fuel cell can directly convert the externally supplied fuel and oxidant into electrical energy through electrochemical reaction without direct combustion, so it is not limited by the Carnot cycle, the energy conversion efficiency can reach 40-60%, and almost no nitro...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/88H01M4/90Y02E60/50
Inventor 向中华赵双周卓航牛明明
Owner BEIJING UNIV OF CHEM TECH