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Preparation method and application of a comn-p-ncnt multifunctional catalyst

A comn-p-ncnt, multi-functional technology, applied in the field of CoMn-P-NCNT multi-functional catalyst and its preparation, can solve the problems limited to powder materials, poor activity, incomplete function, etc., to improve catalytic performance, The effect of complete functions and low equipment requirements

Active Publication Date: 2022-07-15
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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  • Preparation method and application of a comn-p-ncnt multifunctional catalyst
  • Preparation method and application of a comn-p-ncnt multifunctional catalyst
  • Preparation method and application of a comn-p-ncnt multifunctional catalyst

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: 1.167 mmol of cobalt chloride, 2.333 mmol of manganese chloride, 7 mmol of ammonium fluoride, and the amount of urea was 14 mmol (the molar ratio of urea to metal salt was 4) and 17.5 mmol (the molar ratio of urea to metal salt was 4). ratio of 5), 21 mmol (the molar ratio of urea to metal salt is 6), and the concentration of dopamine hydrochloride is 20 mmol / L. Dissolve the above substances in a 100 mL beaker, add 70 mL of deionized water, and stir evenly. Put the carbon paper in the Teflon liner and pour the solution prepared above. After 10 hours of hydrothermal reaction at 100° C., washing and drying, the precursor was obtained.

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

[0045] figure 1 I...

Embodiment 2

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

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

[0049] Then, the above-prepa...

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 precursor: cobalt chloride 1.167mmol, manganese chloride 2.333mmol, ammonium fluoride 7mmol, the amount of urea substance is 21mmol, the concentration of dopamine hydrochloride in the mixed system is (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 in the Teflon liner and pour the solution prepared above. The hydrothermal reaction was carried out at 100°C for 10 hours. Wash, dry.

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

[0054] image 3 It is the in-situ HER polarization curve diagram of the CoMn-P-NCNT multifunctional cat...

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Abstract

The invention discloses a CoMn-P-NCNT multifunctional catalyst and a preparation method and application thereof. The preparation method includes the following steps: S1, dissolving cobalt salt, manganese salt, ammonium fluoride, phosphorus source, dopamine hydrochloride, and urea in 50-90 mL of deionized water, stirring evenly, adding carbon paper, and heating at 60-100 ℃ , the reaction time is 3 ~ 12h. Wash, dry. The CoMn-P-NCNT multifunctional catalyst is obtained by annealing the precursor and urea at 600-900° C. for 1-3 hours. This method has the advantages of low equipment requirements, low cost of raw materials, easy control of reaction conditions, complete functions, in situ growth, and good stability, and can be used as a multifunctional electrocatalyst for 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 a preparation method and application thereof. Background technique [0002] Hydrogen evolution, oxygen evolution, and oxygen reduction performance are of great significance to new energy sources, and can be applied to water electrolysis, metal-air batteries, fuel cells, etc. It is of great significance to develop an efficient, economical, functional and excellent electrocatalyst. Platinum-carbon is by far the most efficient electrocatalyst for ORR and HER. However, such precious metal materials are expensive, and they are also immune to fuel oxidizing molecules and have poor hydrogen evolution capability. Regardless of the challenge, it is important to develop an efficient, durable, and non-inert electrocatalyst. In the prior art, the multifunctional catalysis of cobalt oxide catalysts has the following problems: poor activi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B11/091C25B1/04H01M4/90
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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