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CoMn-P-NCNT multifunctional catalyst as well as a preparation method and application thereof

A comn-p-ncnt, multifunctional technology, applied in the field of CoMn-P-NCNT multifunctional catalyst and its preparation, can solve the problems of poor activity, limited to powder materials, incomplete functions, etc. Catalytic performance, low equipment requirements

Active Publication Date: 2019-11-29
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the multifunctional catalysis of cobalt oxide catalysts has the following problems: poor activity and easy decay to below 60% under alkaline (pH=14) conditions, limited to powder materials, incomplete functions, etc.

Method used

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  • CoMn-P-NCNT multifunctional catalyst as well as a preparation method and application thereof
  • CoMn-P-NCNT multifunctional catalyst as well as a preparation method and application thereof
  • CoMn-P-NCNT multifunctional catalyst as well as a preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 CoMn-NCNT multifunctional catalysts with different urea contents were prepared by the following method.

[0043] Preparation of precursors: cobalt chloride 1.167mmol, manganese chloride 2.333mmol, ammonium fluoride 7mmol, and the amount of urea were 14mmol (the molar ratio of urea to metal salt was 4), 17.5mmol (the molar ratio of urea to metal salt The ratio is 5), 21mmol (the molar ratio of urea to metal salt is 6), and the concentration of dopamine hydrochloride is 20mmol / L. Dissolve the above substances in a 100mL beaker, add 70mL deionized water, and stir well. Put the carbon paper into the Teflon liner and pour the solution prepared above. After hydrothermal reaction at 100°C for 10 hours, it was washed and dried to obtain a precursor.

[0044] Then, the above-prepared precursor and 14 g of urea were annealed at a heating rate of 5° C. / min to 700° C. for 2 hours to obtain the CoMn-NCNT multifunctional catalyst.

[0045] figure 1 The middle is the effe...

Embodiment 2

[0047] Example 2 CoMn-P-NCNT multifunctional catalysts with different sodium hypophosphite contents were prepared by the following method.

[0048] Preparation of precursor: cobalt chloride 1.167mmol, manganese chloride 2.333mmol, ammonium fluoride 7mmol, the amount of urea is 21mmol, the concentration of dopamine hydrochloride in the mixed system is 20mmol / L, add sodium hypophosphite 3.5mmol ( Sodium hypophosphite is 1 times the amount of metal salt substance), 5.25mmol (sodium hypophosphite is 1.5 times the amount of metal salt substance), 7mmol (sodium hypophosphite is 2 times the amount of metal salt substance, and the metal salt is The amount of the total substance of cobalt chloride and manganese chloride), the above substances were dissolved in a 100mL beaker, 70mL deionized water was added, and stirred evenly. Put the carbon paper into the Teflon liner and pour the solution prepared above. Hydrothermal reaction was carried out at 100°C for 10 hours. Wash, tumble dry....

Embodiment 3

[0051] Example 3 CoMn-P-NCNT multifunctional catalysts with different contents of dopamine hydrochloride were prepared by the following method.

[0052] Preparation of precursors: cobalt chloride 1.167mmol, manganese chloride 2.333mmol, ammonium fluoride 7mmol, the amount of urea is 21mmol, the concentration of dopamine hydrochloride in the mixed system is respectively (16mmol / L, 20mmol / L, 24mmol / L), the amount of phytic acid substance is 5.25mmol, dissolve the above substance in a 100mL beaker, add 70mL deionized water, and stir evenly. Put the carbon paper into the Teflon liner and pour the solution prepared above. Hydrothermal reaction was carried out at 100°C for 10 hours. Wash, tumble dry.

[0053] Then, the above-prepared precursor and 14 g of urea were annealed at a heating rate of 5° C. / min to 700° C. for 2 hours to obtain the CoMn-P-NCNT multifunctional catalyst.

[0054] image 3 The in-situ HER polarization curve figure of the CoMn-P-NCNT multifunctional cataly...

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Abstract

The invention discloses a CoMn-P-NCNT multifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a cobalt salt, a manganese salt, an ammonium fluoride, a phosphorus source, dopamine hydrochloride and urea in 50-90mL of deionized water, uniformly stirring, adding carbon paper, and reacting at 60-100 DEG C for 3-12 hours; washing and drying; and annealing the precursor and urea for 1 to 3 hours at the temperature of between 600 and 900 DEG C to obtain the CoMn-P-NCNT multifunctional catalyst. The method has the advantages of low equipment requirement, low cost of required raw materials, easy control of reaction conditions, complete functions, in-situ growth, good stability and the like, and can be used for multifunctional electrocatalysts of HER, OER and ORR.

Description

technical field [0001] The invention relates to an in-situ electrode and its preparation, in particular to a CoMn-P-NCNT multifunctional catalyst and its preparation method and application. Background technique [0002] Hydrogen evolution, oxygen evolution, and oxygen reduction performance are of great significance to new energy sources, and can be applied to electrolysis of water, metal-air batteries, fuel cells, etc. It is of great significance to study an electrocatalyst with high efficiency, economy, complete functions and excellent performance. Platinum carbon is by far the most effective electrocatalyst for ORR and HER. However, such noble metal materials are expensive, immune to fuel oxidation molecules, and have poor hydrogen evolution ability. Regardless of the challenges faced, it is of great importance to develop an efficient, durable, and non-inert electrocatalyst. In the prior art, the multifunctional catalysis of cobalt oxide catalysts has the following prob...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B11/06C25B1/04H01M4/90
CPCB01J27/24C25B11/04C25B1/04H01M4/9041H01M4/9083B01J35/33Y02E60/50
Inventor 孙小华陈善华赵亚强郑力李鸣黄延清刘秋恒
Owner CHINA THREE GORGES UNIV
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