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Preparation method of boron and nitrogen co-doped nonmetal carbon-based oxygen reduction electrocatalyst based on ZIF-8

A technology of ZIF-8 and electrocatalyst, which is applied in the direction of nanotechnology, circuits, electrical components, etc. for materials and surface science, to achieve excellent catalytic activity and long-term stability, simple and easy to operate, and simple and easy to prepare Effect

Inactive Publication Date: 2019-10-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of heteroatom-doped porous carbon nanomaterials using ZIF-8 as a precursor has received extensive attention, but using ZIF-8 as a precursor and phenylboronic acid as a boron source, B, N co-doped porous carbon materials were prepared and applied to Cases of electrocatalytic oxygen reduction catalysts still unreported

Method used

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  • Preparation method of boron and nitrogen co-doped nonmetal carbon-based oxygen reduction electrocatalyst based on ZIF-8
  • Preparation method of boron and nitrogen co-doped nonmetal carbon-based oxygen reduction electrocatalyst based on ZIF-8
  • Preparation method of boron and nitrogen co-doped nonmetal carbon-based oxygen reduction electrocatalyst based on ZIF-8

Examples

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preparation example Construction

[0032] Step 1, preparation of precursor ZIF-8 material:

[0033] Weigh 0.117g of zinc nitrate hexahydrate, dissolve it in 10mL of distilled water, and ultrasonically dissolve it completely to obtain a solution of zinc nitrate hexahydrate; take another 2.270g of 2-methylimidazole, dissolve it in 90mL of distilled water, and ultrasonically Dissolve it completely to obtain a 2-methylimidazole solution; mix and stir the two solutions obtained above, react at room temperature for 12 hours to obtain a ZIF-8 solution, and place the obtained ZIF-8 solution in a centrifuge for 8 minutes to obtain a solution containing Solvent water, zinc nitrate, 2-methylimidazole impurity ZIF-8 solid, the ZIF-8 solid containing solvent water, zinc nitrate, 2-methylimidazole impurity was ultrasonically washed with methanol 3-5 times, vacuum dried at 60°C Dry in the oven for 12 hours; get the ZIF-8 solid from which the impurities of zinc nitrate and 2-methylimidazole have been removed; activate the ZIF-...

specific Embodiment 1

[0044] Step 1, preparation of precursor ZIF-8 material:

[0045] Weigh 0.117g of zinc nitrate hexahydrate, dissolve it in 10mL of distilled water, and ultrasonically dissolve it completely to obtain a solution of zinc nitrate hexahydrate; take another 2.270g of 2-methylimidazole, dissolve it in 90mL of distilled water, and ultrasonically Dissolve it completely to obtain a 2-methylimidazole solution; mix and stir the two solutions obtained above, react at room temperature for 12 hours to obtain a ZIF-8 solution, and place the obtained ZIF-8 solution in a centrifuge for 8 minutes to obtain a solution containing Solvent water, zinc nitrate, 2-methylimidazole impurity ZIF-8 solid, the ZIF-8 solid containing solvent water, zinc nitrate, 2-methylimidazole impurity was ultrasonically washed with methanol 3-5 times, vacuum dried at 60°C Dry in the oven for 12 hours; obtain the ZIF-8 solid from which the impurities of zinc nitrate and 2-methylimidazole have been removed; vacuumize and ...

specific Embodiment 2

[0051] Step 1, the preparation of ZIF-8 precursor:

[0052] Prepared according to the method and conditions of step 1 in Example 1;

[0053] Step 2, preparation of catalyst precursor:

[0054] Prepared according to the method and conditions of step 2 in Example 1;

[0055] Step 3, preparation of boron and nitrogen co-doped carbon material

[0056] Put the precursor material obtained in the above step 2 into a tube furnace, in a nitrogen atmosphere, raise the temperature to 950°C at 5°C / min, and keep it at this temperature for 2h, and cool it to room temperature at 5°C / min to obtain boron, nitrogen Co-doped metal-free carbon-based oxygen reduction electrocatalyst;

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Abstract

The invention relates to a preparation method of a boron and nitrogen co-doped nonmetal carbon-based oxygen reduction electrocatalyst based on ZIF-8. The preparation method comprises the following steps of: obtaining a ZIF-8 precursor by controlling the synthesis conditions of crystals; mixing the precursor crystals with phenylboronic acid micromolecules through a solvent, and performing stirringto form a uniformly dispersed mixed material; and finally, performing carbonizing at a high temperature in a tubular furnace to obtain a black powdery carbon material, wherein the boron and nitrogen co-doped nonmetal carbon-based catalyst is obtained without further post-treatment. The method has the advantages that: the material has rich sources and lower cost, and the prepared material has highoxygen reduction catalytic activity, good stability and methanol tolerance, and has the wide application prospect and the practical value.

Description

technical field [0001] The invention relates to a method for preparing a boron and nitrogen co-doped non-metallic carbon material with excellent electrocatalytic oxygen reduction activity, and mainly relates to the fields of material chemistry, fuel cells, and cathode oxygen reduction catalysts. Background technique [0002] The rapid development of today's society requires huge energy support, and the increasingly severe ecological problems make us urgently need to find an efficient and green energy utilization method. Fuel cells have the advantages of high energy conversion efficiency and low environmental pollution, which can effectively solve the contradiction between energy demand and environmental pollution. Currently, the main factor restricting the development of fuel cells is the low efficiency of the oxygen reduction reaction (Oxygen Reduction Reaction, ORR) at the cathode. The traditional cathode catalytic material Pt has problems such as low reserves and high pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96B82Y30/00
CPCB82Y30/00H01M4/96Y02E60/50
Inventor 诸海滨孙志远
Owner SOUTHEAST UNIV
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