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Preparation method of CNT-Zn monatomic catalytic material

A technology of catalytic materials and atoms, applied in electrolysis components, electrodes, electrolysis process, etc., can solve the problems of unclear relationship between active sites and catalytic performance, cumbersome preparation methods, and high cost.

Active Publication Date: 2022-05-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this context, although transition metal compounds, hydroxides, alloys, and carbon-based materials have made some progress, these catalysts have the following disadvantages: cumbersome preparation methods, high cost, low metal utilization, active sites and catalytic performance. The relationship between

Method used

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  • Preparation method of CNT-Zn monatomic catalytic material
  • Preparation method of CNT-Zn monatomic catalytic material
  • Preparation method of CNT-Zn monatomic catalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The CNT-Zn composite was prepared according to the following steps:

[0023] 1. Disperse the carbon nanotubes in a mixed solution of deionized water and ethanol (volume ratio 1:1), ultrasonically crush for 1 hour, then filter, and disperse the carbon nanotubes in 2M H 2 SO 4 In the solution, ozone gas was passed through for 1 hour under the condition of a water bath at 25°C.

[0024] 2. Ball mill 2.2g of potassium chloride, 2.2g of sodium chloride and 4.4g of zinc chloride, and then add 640mg of carboxylated carbon nanotubes for ball milling.

[0025] 3. Put the above black powder in a tube furnace, raise the temperature to 800°C at a rate of 5°C / min under an argon atmosphere, keep the temperature constant for 2 hours, and then lower it to room temperature at a rate of 5°C / min to obtain CNT-Zn- 800 single-atom materials.

[0026] 4. Disperse the prepared CNT-Zn-800 single-atom material in 1M HCl solution, and stir at 80° C. for 12 hours. After filtration, it was vac...

Embodiment 2

[0028] 1. Disperse the carbon nanotubes in a mixed solution of deionized water and ethanol (volume ratio 1:1), ultrasonically crush for 1 hour, then filter, and disperse the carbon nanotubes in 2M H 2 SO 4 In the solution, ozone gas was passed through for 1 hour under the condition of a water bath at 25°C.

[0029] 2. Ball mill 2.2g of potassium chloride, 2.2g of sodium chloride and 4.4g of zinc chloride, and then add 640mg of carboxylated carbon nanotubes for ball milling.

[0030] 3. Put the above-mentioned black powder in a tube furnace, raise the temperature to 900°C at a rate of 5°C / min under an argon atmosphere, keep the temperature constant for 2 hours, and then lower it to room temperature at a rate of 5°C / min to obtain CNT-Zn- 900 single-atom materials.

[0031] 4. Disperse the prepared CNT-Zn-900 single-atom material in 1M HCl solution, and stir at 80°C for 12 hours. After filtration, it was vacuum-dried at 60°C.

Embodiment 3

[0033] 1. Disperse the carbon nanotubes in a mixed solution of deionized water and ethanol (volume ratio 1:1), ultrasonically crush for 1 hour, then filter, and disperse the carbon nanotubes in 2M H 2 SO 4 In the solution, ozone gas was passed through for 1 hour under the condition of a water bath at 25°C.

[0034] 2. Ball mill 2.2g of potassium chloride, 2.2g of sodium chloride and 4.4g of zinc chloride, and then add 640mg of carboxylated carbon nanotubes for ball milling.

[0035] 3. Put the above black powder in a tube furnace, raise the temperature to 1000°C at a rate of 5°C / min under an argon atmosphere, keep the temperature constant for 2 hours, and then lower it to room temperature at a rate of 5°C / min to obtain CNT-Zn- 1000 monatomic materials.

[0036] 4. Disperse the prepared CNT-Zn-1000 single-atom material in 1M HCl solution, and stir at 80°C for 12 hours. After filtration, it was vacuum-dried at 60°C.

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Abstract

The invention belongs to the field of monatomic materials, and provides a preparation method of a CNT-Zn monatomic catalytic material, the catalytic material takes a carboxylated carbon nanotube treated by ozone as a precursor, then the precursor and ternary molten salt are ball-milled and uniformly mixed, and finally, high-temperature annealing is performed in inert gas to obtain CNT-Zn. The preparation method is simple, carboxylated carbon nanotubes are obtained through pretreatment, then the carboxylated carbon nanotubes and the ternary molten salt are subjected to ball milling and uniform mixing, and finally high-temperature annealing treatment is performed to obtain the carbon nanotube and carbon nanobelt composite structure loaded zinc monatomic material. The composite material has excellent electrocatalytic water desorption and oxygen desorption performance under an alkaline condition, and has strong stability in a long-time reaction process.

Description

technical field [0001] The invention belongs to the field of single-atom materials, specifically a new type of single-atom catalyst for electrocatalytic water splitting reaction, that is, carbon nanotube-carbon nanobelt-loaded zinc single-atom material CNT-Zn, which is carboxylated by ozone treatment Carbon nanotubes are obtained by high temperature annealing in a molten salt environment. Background technique [0002] Electrochemical water separation is expected to be an attractive approach to address impending fossil fuel depletion and environmental concerns. Oxygen evolution reaction (OER), which occurs at the anode during water splitting, is inherently sluggish in kinetics, which restricts the overall efficiency of energy conversion. Therefore, highly efficient electrocatalysts are needed to reduce the overpotential of OER to enhance the efficiency of water splitting. RuO 2 and IrO 2 are benchmark OER electrocatalysts with appreciable turnover frequencies at moderate ...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/052C25B11/069C25B11/091
CPCC25B1/04C25B11/052C25B11/069C25B11/091Y02E60/36
Inventor 史彦涛郭静雅
Owner DALIAN UNIV OF TECH
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