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Method for preparing boron-nitrogen-carbon ternary material from carbon nitride

A ternary material and carbon nitride technology, which is applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of requiring special equipment, difficulty in mass production, low yield, etc., to achieve high activity and excellent stability

Inactive Publication Date: 2018-08-10
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to achieve large-scale preparation, and requires special equipment, and the yield is very low

Method used

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  • Method for preparing boron-nitrogen-carbon ternary material from carbon nitride
  • Method for preparing boron-nitrogen-carbon ternary material from carbon nitride
  • Method for preparing boron-nitrogen-carbon ternary material from carbon nitride

Examples

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Effect test

Embodiment 1

[0038] This example is used to illustrate the steps of the preparation method of the boron-nitrogen-carbon ternary material of the present invention as follows:

[0039] The melamine was placed in a crucible, the crucible was wrapped with tin foil, and placed in a muffle furnace at a heating rate of 5°C / min, and the temperature was raised to 600°C for 2 hours to prepare carbon nitride. Take 2g of carbon nitride and 2g of sodium borohydride and place them in a mortar and grind for 30 minutes; place the mixture in a tube furnace, under the protection of argon / hydrogen (95 / 5) mixed gas, at a heating rate of 5°C / min, After heating to 1000°C and reacting for 2 hours, the temperature is naturally lowered. The obtained black powder is repeatedly washed with water, centrifuged, and dried to obtain a boron-nitrogen-carbon ternary material. The final obtained boron-nitrogen-carbon ternary material is 1.72 g (yield is as high as 43%), and the molar percentage content of each element is det...

Embodiment 2

[0041] This example is used to illustrate the steps of the method for etching and stripping the boron-nitrogen-carbon ternary material of the present invention as follows:

[0042] Dissolve 1g of the boron-nitrogen-carbon ternary material obtained in Example 1 and 1.5g of potassium hydroxide in 30ml of deionized water, sonicate or stir for 30min, raise the temperature to steam out the water in the mixture to obtain a mixed powder; Put the powder in a nickel crucible and put it in a tube furnace. Under the protection of argon / hydrogen (95 / 5) mixed gas, the temperature is raised to 800℃ at a heating rate of 5℃ / min for 2h. Cool down naturally. The obtained product is repeatedly washed with water and centrifuged until the pH value is close to neutral; after drying, the stripped boron-nitrogen-carbon ternary nanosheet material is obtained. The measured molar percentages of the elements are 33.69% boron, 34.75% nitrogen, 25.52% carbon, and 6.04% oxygen.

Embodiment 3

[0044] This example is used to illustrate the steps of the preparation method of the boron-nitrogen-carbon ternary material of the present invention as follows:

[0045] The melamine was placed in a crucible, the crucible was wrapped with tin foil, and placed in a muffle furnace. The temperature was raised to 600°C for 2h at a rate of 5°C / min to prepare carbon nitride. Take 2g of carbon nitride and 14g of tetrabutylammonium borohydride and grind for 30min in a mortar; place the mixture in a tube furnace under the protection of an argon / hydrogen (95 / 5) mixed gas at a heating rate of 5 ℃ / min. After heating to 1000℃ for 2h, the temperature will be cooled naturally. The obtained black powder is repeatedly washed with water, centrifuged, and dried to obtain a boron-nitrogen-carbon ternary material.

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PUM

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Abstract

The invention provides a boron-nitrogen-carbon ternary material which is prepared by grinding and mixing borohydride and carbon nitride powder and carrying out high-temperature reaction under the protection of inert gas. High-temperature peeling is carried out under the condition that an activating agent is added, so as to prepare the boron-nitrogen-carbon ternary material with a high specific surface area. The prepared boron-nitrogen-carbon ternary material is used as an electro-catalyst and can be used for electrically catalyzing oxygen reduction reaction and hydrogen evolution reaction.

Description

Technical field [0001] The invention relates to the preparation and stripping of a boron-nitrogen-carbon ternary material and its application in electrochemical catalysis. Background technique [0002] With the current climate warming, the supply of fossil fuels is increasingly depleted, forcing humans to develop various clean energy conversion and storage devices. For example, various clean energy conversion technologies such as fuel cells, electrolyzed water, metal-air batteries, etc. have become the hot spots of basic research and applied research in various countries. The core of these energy conversion technologies is a series of electrochemical processes, including oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). The oxygen reduction reaction is the core of the fuel cell, and the hydrogen evolution reaction is the key to water splitting to produce hydrogen. Therefore, it is of great significance to explore high-perfor...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/08C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J37/08B01J37/082B01J35/33B01J35/61Y02E60/36
Inventor 张中一曲丽辉张慧王士财杜辉孙德帅
Owner QINGDAO UNIV
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