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Preparation method and application of carbon material rich in topological defects obtained through high-temperature ammonia treatment

A carbon material and ammonia treatment technology, applied in the direction of carbon preparation/purification, separation methods, chemical instruments and methods, etc., can solve the problems of expensive catalyst, poor selectivity, poor stability, etc., and achieve high-efficiency carbon dioxide electroreduction catalytic activity, The preparation method is simple and easy, and the effect of high selectivity

Active Publication Date: 2021-05-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Catalysts based on noble metals have high selectivity for the electrochemical reduction of carbon dioxide, and the selectivity of carbon monoxide products can reach more than 90%, but the catalyst is expensive and has poor stability, which limits its wide application.
The price of non-metallic materials is lower and the stability is better, but there are disadvantages of low activity and poor selectivity

Method used

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  • Preparation method and application of carbon material rich in topological defects obtained through high-temperature ammonia treatment
  • Preparation method and application of carbon material rich in topological defects obtained through high-temperature ammonia treatment
  • Preparation method and application of carbon material rich in topological defects obtained through high-temperature ammonia treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the carbon material rich in topological defects is prepared as follows:

[0041] (1) Preparation of ZIF-8 precursor

[0042] 4.05g zinc nitrate hexahydrate and 2.63g 2-methylimidazole were dissolved in 200ml of methanol respectively, the two solutions obtained were mixed and stirred for 5 minutes, then left to stand at room temperature for 24 hours, finally centrifuged and washed and separated, Dry in an oven at 60°C for 12 hours.

[0043] (2) Heat treatment in an inert gas atmosphere

[0044] The ZIF-8 precursor obtained in step (1) was put into a tube furnace, heated to 800°C at a rate of 5°C / min after argon flow for 2 hours, kept for 2 hours, and then cooled down to room temperature naturally.

[0045] (3) Acid etching cleaning

[0046] The product obtained in step (2) was washed with 36% hydrochloric acid and centrifuged three times, then washed with deionized water until neutral, and finally dried in an oven at 60° C. for 12 hours.

[0047] (4)...

Embodiment 2

[0070] In this embodiment, the preparation of the carbon dioxide electrochemical reduction catalyst is as follows:

[0071] (1) Preparation of ZIF-8 precursor

[0072] Same as step (1) in Example 1.

[0073] (2) Heat treatment in an inert gas atmosphere

[0074] Same as step (2) in Example 1.

[0075] (3) Acid etching cleaning

[0076] Same as step (3) in Example 1.

[0077] (4) Ammonia heat treatment

[0078] The product obtained in step (3) was put into a tube furnace, raised to 900°C at a rate of 10°C / min in 100% ammonia gas, kept for 1 hour, and then cooled naturally to room temperature.

Embodiment 3

[0080] In this embodiment, the preparation of the carbon dioxide electrochemical reduction catalyst is as follows:

[0081] (1) Preparation of ZIF-8 precursor

[0082] Same as step (1) in Example 1.

[0083] (2) Heat treatment in an inert gas atmosphere

[0084] Same as step (2) in Example 1.

[0085] (3) Acid etching cleaning

[0086] Same as step (3) in Example 1.

[0087] (4) Ammonia heat treatment

[0088] The product obtained in step (3) was put into a tube furnace, raised to 800°C at a rate of 10°C / min in 100% ammonia gas, kept for 1 hour, and then cooled naturally to room temperature.

[0089] According to the XPS of the carbon material obtained in the above-mentioned comparative examples and examples 1-3, the nitrogen content therein is as follows:

[0090]

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Abstract

The invention discloses a preparation method for obtaining a carbon material rich in topological defects through high-temperature ammonia treatment. According to the method, a nitrogen-doped carbon material is used as a precursor, heat treatment is carried out in an ammonia atmosphere, and the carbon material rich in carbon topological defects is obtained, has efficient carbon dioxide electro-reduction catalytic activity, has high selectivity on CO and has high stability, so that the carbon material can be used as a carbon dioxide electrochemical reduction catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrochemical carbon dioxide reduction, in particular to a preparation method and application of high-temperature ammonia treatment to obtain rich topological defect carbon materials. Background technique [0002] As a greenhouse gas, carbon dioxide is one of the important components of the earth's carbon cycle. Since the first industrial revolution, the content of carbon dioxide in the atmosphere has increased year by year, which has become one of the reasons for the intensification of the global warming effect. Therefore, the technology of converting carbon dioxide into formic acid, carbon monoxide, hydrocarbons and other chemical raw materials with high added value has been extensively studied in recent decades. [0003] Electrochemical reduction of carbon dioxide is a widely concerned technology, after decades of research, there are still many technical problems. As far as the catalyst itself is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01D53/86B01D53/62B01J27/24
CPCC01B32/05B01D53/864B01J27/24B01J35/33Y02E60/50
Inventor 陈亮董岩苏建伟张秋菊杨跃平吴凯胡敬奎
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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