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Carbon nitride polyporous material and use thereof for hydrogen storage

A porous material, carbon and nitrogen technology, applied in the field of inorganic nanomaterials chemistry and new energy, can solve the problems of not being able to change the composition of carbon skeleton elements, reduce the pore volume and specific surface area of ​​carbon materials, achieve easy control, improve hydrogen storage performance, The effect of increasing the specific surface area

Inactive Publication Date: 2009-02-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual method is to carry out surface ammoniation under high temperature ammonia gas, but this method cannot change the element composition in the carbon skeleton, and usually reduces the pore volume and specific surface area of ​​carbon materials

Method used

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  • Carbon nitride polyporous material and use thereof for hydrogen storage
  • Carbon nitride polyporous material and use thereof for hydrogen storage
  • Carbon nitride polyporous material and use thereof for hydrogen storage

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 4.4g of ethylenediamine, 10.8g of carbon tetrachloride, and 1.0g of SBA-15 template were mixed, and after two hours of magnetic stirring, the temperature of the mixture was raised to 90°C, and stirred and refluxed for 6h. The obtained samples were first dried at 100°C for one night, and then put into a tube into a furnace. Under a nitrogen atmosphere, the temperature was raised to 600°C at a heating rate of 5K / min, kept for 6 hours, and then cooled to take out the samples. 8% HF acid removed the silicon template, followed by multiple washes with ethanol and water. Finally, it is dried in air at 100°C, and the obtained product is ordered mesoporous carbonitride, abbreviated as MCN-1. A certain amount of MCN-1 samples were placed in a tube furnace, and argon was used as a protective atmosphere, and the temperature was raised to 950 °C at a heating rate of 5 °C / min. Turn off the argon gas source, introduce a carbon dioxide atmosphere with a flow rate of 22mL / min, keep it ...

Embodiment 2

[0030] This example is basically the same as Example 1, except that in the subsequent carbon dioxide activation process, the activation time is 3 hours. The obtained sample is abbreviated as MCN-1-3h. At room temperature, the sample was first vacuumed for 12 hours to activate the sample, and then high-purity hydrogen was introduced to pressurize, in which every ten atmospheres of pressure was balanced and stable for 2 hours, and the pressure was increased to 80 atmospheres.

[0031] image 3 Shown is the transmission electron microscope image of the prepared MCN-1-3h sample. It can be seen that the particles still maintain a spherical shape, are well dispersed, and the interior of the particles is a vacuum structure. The particle outer diameter is about 250nm, and the shell thickness is about 20nm. The mesoporous structure of the shell wall has completely disappeared, and a rich disordered microporous structure is formed, and the micropore size is about 0.7nm. Such micropo...

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Abstract

The invention relates to a carbon-nitrogen porous material and a hydrogen storage application thereof, which belong to the field of inorganic nano material chemistry and new energy resources-related technology. An ordered meso-porous carbon-nitrogen compound is prepared by a meso-porous silicon dioxide hard template method, wherein, ethylene diamine is taken as a precursor and carbon tetrachloride is taken as a solution; the ethylene diamine and the carbon tetrachloride are mixed and stirred evenly for reflux and immersion; the sample obtained is carbonized at high temperature and detemplated to obtain an ordered meso-porous carbon-nitrogen material; the ordered meso-porous carbon-nitrogen material is treated and activated by carbon dioxide at high temperature, wherein, air flow, activation temperature and activation time are controlled; and then a nitrogen-doped porous carbon material with special appearance and pore structure is obtained. The material can be taken as a high-performance hydrogen storage medium at room temperature, and can absorb 2.21wt% hydrogen in a reversible manner under the condition of room temperature and 80Mpa. Compared with the conventional hydrogen alloy, the carbon material has the advantages of low cost, good cycle performance and higher hydrogen storage capacity.

Description

technical field [0001] The invention relates to a carbon-nitrogen porous material and its hydrogen storage application, and belongs to the related technical fields of inorganic nanometer material chemistry and new energy. Background technique [0002] Porous carbon materials have been widely used in the fields of adsorption, catalysis, separation and supercapacitor. The porous carbon materials used in the early stage are mainly activated carbons, which have high specific surface area and rich nanoporous structure, and are easy to be prepared on a large scale. Subsequent activation treatment, such as carbon dioxide high-temperature activation, alkali high-temperature activation or water vapor high-temperature activation, can further improve its pore structure and increase the specific surface area, which is beneficial to its functional application. Since Ryoo et al. (Ryoo, R.et. al., J.Phys.Chem.B, 1999, 103, 7743) first reported the work of ordered mesoporous carbon in 1999...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/08
Inventor 高秋明姜金华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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