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Preparation of carbon nanotube material embedded with quantum-dot modified metal organic framework

A metal-organic framework, quantum dot material technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor electrical conductivity of metal-organic frameworks

Active Publication Date: 2016-12-21
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose 1: Combining quantum dots that can be good electron donors and acceptors with metal organic frameworks to effectively improve the poor electrical conductivity of metal organic frameworks

Method used

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  • Preparation of carbon nanotube material embedded with quantum-dot modified metal organic framework
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  • Preparation of carbon nanotube material embedded with quantum-dot modified metal organic framework

Examples

Experimental program
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Effect test

Embodiment 1

[0068] A schematic diagram of a carbon quantum dot-modified metal-organic framework embedded in a carbon nanotube material, see figure 1 , the detailed preparation steps are as follows: first, zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) 0.20g and terephthalic acid 0.04g were placed in a 50ml wide-mouth bottle, 15mL N,N-diethylformamide (DEF) was added, and ultrasonic treatment was performed for 30min to completely dissolve the solid and turn into a clear solution. Then, 20 mg of carbon quantum dots (CQD) were added under stirring conditions, transferred to a screw bottle and sealed, and transferred to a constant temperature drying oven at 100° C. for 48 h. The product was moved to a glove box, filtered at room temperature, rinsed with 15 mL of DEF, and dried naturally to obtain CQD / UMCM-1 with a certain crystal structure. Then the obtained 3.0g CQD / UMCM-1 sample was mixed with 3.0g melamine powder, and heated at 5°C min under the protection of nitrogen flow. -1 The temperature was ...

Embodiment 2

[0071] A schematic diagram of a carbon quantum dot-modified metal-organic framework embedded in a carbon nanotube material, see figure 1 , the detailed preparation steps are as follows: first, zinc nitrate (Zn(NO 3 ) 2 ·6H 2 (O) 0.30g and terephthalic acid 0.06g were put into a 50ml wide-mouth bottle, 20mL N,N-diethylformamide (DEF) was added, and ultrasonic treatment was performed for 40min to completely dissolve the solid and turn into a clear solution. Then, 30 mg of carbon quantum dots (CQD) were added under stirring conditions, transferred to a screw bottle to seal, and transferred to a constant temperature drying oven to react at a temperature of 120°C for 48 hours. The product was moved to a glove box, filtered at room temperature, then rinsed with 20 mL of DEF, and dried naturally to obtain CQD / UMCM-1 with a certain crystal structure. Then the obtained 5.0g CQD / UMCM-1 sample was mixed with 5.0g melamine powder, and heated at 8°C min under the protection of nitrogen ...

Embodiment 3

[0073] A schematic diagram of a carbon quantum dot-modified metal-organic framework embedded in a carbon nanotube material, see figure 1 , the detailed preparation steps are as follows: first, zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) 0.60 g and terephthalic acid 0.08 g were placed in a 50 ml wide-mouth bottle, 25 mL of N,N-diethylformamide (DEF) was added, and ultrasonic treatment was performed for 45 min to completely dissolve the solid and turn into a clear solution. Then, 40 mg of carbon quantum dots (CQD) were added under stirring conditions, transferred to a screw bottle and sealed, and transferred to a constant temperature drying oven at 150° C. for 48 hours. The product was moved to a glove box, filtered at room temperature, then rinsed with 25 mL of DEF, and dried naturally to obtain CQD / UMCM-1 with a certain crystal structure. Then the obtained 8.0g CQD / UMCM-1 sample was mixed with 8.0g melamine powder, and heated at 10°C min under the protection of nitrogen flow. -1The...

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Abstract

The invention provides preparation of a carbon nanotube material embedded with a quantum-dot modified metal organic framework. The preparation comprises the following steps of firstly, adding a certain amount of powder quantum dots to a formed metal organic framework precursor solvent so that the quantum dots of which the diameters are matched with the sizes of pore passages are embedded into the pore passages of the formed metal organic framework; secondly, uniformly mixing the obtained quantum-dot modified metal organic framework and melamine powder, and performing high-temperature processing to obtain a composite material (QD / UMCM-1@CNT) in a carbon nanotube embedded with the quantum-dot modified metal organic framework; and finally, enabling Pt to be loaded on a surface of the composite material carbon nanotube (Pt / QD / UMCM-1@CNT) by microwave radiation heating to be used as a positive electrode catalyst of a methanol fuel cell. Compared with a traditional hydrothermal method for synthesis of the carbon nanotube, the quantum-dot modified metal organic framework obtained by high-temperature processing is embedded into the composite material in the carbon nanotube, the structural aspects such as the length and the diameter of the carbon nanotube are more consistent, and a catalyst substrate with a unified structure is easier to form.

Description

technical field [0001] The invention belongs to the field of composite catalyst preparation, in particular to the preparation of a quantum dot modified metal organic framework embedded carbon nanotube material. Background technique [0002] Direct methanol fuel cell (DMFC), as a clean and efficient power generation device that directly converts chemical energy in fuel into electrical energy, is of great significance to energy generation and storage, and provides the possibility to solve energy shortages and alleviate environmental pollution problems . However, because the oxidation process is a multi-level diproton transfer process and requires a high overpotential, the oxidation process of alcohols in direct methanol fuel cells is very slow. The existing method for reducing the overpotential of the oxidation reaction is to use noble metals such as Pt as catalysts. The addition of Pt can significantly reduce the overpotential and significantly increase the oxidation reacti...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/926Y02E60/50
Inventor 王宗花王帧玉张菲菲
Owner QINGDAO UNIV
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