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Preparation method and application of rare earth metal and transition metal co-doped carbon-based material

A technology of transition metals and rare earth metals, which is applied in the electrolysis process, electrodes, electrolysis components, etc., can solve the problems of affecting the electrochemical performance of catalysts, low metal atom utilization, and uneven distribution of active sites, achieving excellent carbon monoxide selectivity, Excellent electrochemical performance and optimized selectivity

Active Publication Date: 2021-11-26
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the physical and chemical properties of transition metals are active, which easily leads to their agglomeration during the calcination preparation process, and the resulting uneven distribution of active sites and low utilization of metal atoms will significantly affect the electrochemical performance of the catalyst.

Method used

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  • Preparation method and application of rare earth metal and transition metal co-doped carbon-based material
  • Preparation method and application of rare earth metal and transition metal co-doped carbon-based material
  • Preparation method and application of rare earth metal and transition metal co-doped carbon-based material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 0.1g Ketjen black, 1mmol nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and 1 mmol gadolinium nitrate hexahydrate (Gd(NO 3 ) 2 ·6H 2 O) in a beaker, then add 15 mL of deionized water and 3 mL of ethanol to the beaker. After ultrasonic treatment for 30 min, the mixture A was obtained. Weigh 1.64g of 2-methylimidazole into a beaker, and then add 15mL of deionized water to obtain solution B. Subsequently, the mixed solution A was added into the solution B, and magnetically stirred at room temperature for 4 h. The resulting mixture was added to a centrifuge tube and separated with a centrifuge. Subsequently, the precipitate was washed three times with deionized water, and then the obtained solid was dried overnight in an oven at 80°C. The obtained powder was put into a tube furnace, heated to 700° C. at a heating rate of 5° C. / min in a nitrogen atmosphere, and kept for 2 hours. Subsequently, the tube furnace was naturally cooled to room temperature. Add th...

Embodiment 2

[0040] Weigh 0.1g Ketjen black, 1mmol nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and 1 mmol gadolinium nitrate hexahydrate (Gd(NO 3 ) 2 ·6H 2 O) in a beaker, then add 15 mL of deionized water and 3 mL of ethanol to the beaker. After ultrasonic treatment for 30 min, the mixture A was obtained. Weigh 1.64g of 2-methylimidazole into a beaker, and then add 15mL of deionized water to obtain solution B. Subsequently, the mixed solution A was added into the solution B, and magnetically stirred at room temperature for 4 h. The resulting mixture was added to a centrifuge tube and separated with a centrifuge. Subsequently, the precipitate was washed three times with deionized water, and then the obtained solid was dried overnight in an oven at 80°C. The obtained powder was put into a tube furnace, heated to 600° C. at a heating rate of 5° C. / min in a nitrogen atmosphere, and kept for 2 hours. Subsequently, the tube furnace was naturally cooled to room temperature. Add th...

Embodiment 3

[0042] Weigh 0.1g Ketjen black, 1mmol nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) and 1 mmol gadolinium nitrate hexahydrate (Gd(NO 3 ) 2 ·6H 2 O) in a beaker, then add 15 mL of deionized water and 3 mL of ethanol to the beaker. After ultrasonic treatment for 30 min, the mixture A was obtained. Weigh 1.64g of 2-methylimidazole into a beaker, and then add 15mL of deionized water to obtain solution B. Subsequently, the mixed solution A was added into the solution B, and magnetically stirred at room temperature for 4 h. The resulting mixture was added to a centrifuge tube and separated with a centrifuge. Subsequently, the precipitate was washed three times with deionized water, and then the obtained solid was dried overnight in an oven at 80°C. The obtained powder was put into a tube furnace, heated to 800° C. at a heating rate of 5° C. / min in a nitrogen atmosphere, and kept for 2 hours. Subsequently, the tube furnace was naturally cooled to room temperature. Add th...

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Abstract

The invention discloses a preparation method and application of a rare earth metal and transition metal co-doped carbon-based material; the method includes: weighing a proper amount of porous carbon, a transition metal precursor and a rare earth metal precursor, adding deionized water and ethanol, and after ultrasonic treatment is performed for 30 min, preparing a mixed solution A; then adding the mixed solution A into the organic ligand solution, and stirring at room temperature for 3-5 hours; centrifuging, washing and drying the mixture; and putting the obtained powder into a tubular furnace for heat treatment, carrying out acid pickling treatment on the obtained black powder, then carrying out suction filtration and water washing until the filtrate is neutral, and drying the powder to obtain the transition metal and rare earth metal co-doped carbon-based material. The prepared carbon-based material has rich pore structures and excellent carbon monoxide selectivity, the Faraday efficiency can reach 99% at most, the current density can reach 97 mA / cm2 at most, and the electrochemical performance is excellent.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and electrochemistry, and relates to a carbon-based material, in particular to a preparation method and application of a rare earth metal and transition metal co-doped carbon-based material. Background technique [0002] In recent years, the excessive use of fossil fuels has resulted in atmospheric carbon dioxide (CO 2 ) concentrations are increasing. Currently, CO 2 The atmospheric concentration has reached 413ppm, which is much higher than the safe level (350ppm) for the stable development of human society. Excess carbon dioxide leads to an increase in global average temperature and causes serious problems such as climate anomalies. Therefore, the problem of carbon dioxide has attracted great attention from all countries in the world. Among them, China strives to reach CO2 by 2030 2 emissions peak. [0003] After years of hard work, a variety of technologies have been developed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/031C25B11/052C25B1/23
CPCC25B11/091C25B11/031C25B11/052C25B1/23
Inventor 徐朗刘伟琪江海深白沛瑶魏仕林齐佳伟杨闯闯
Owner CHINA UNIV OF MINING & TECH
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