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Nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and preparation method thereof

A technology of nitrogen-doped carbon and monatomic oxygen, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of easy reunion channels, single coordination structure, low conductivity, etc., and achieve abundant lattice defect sites , simple operation process, high load effect

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the current research are: (1) MOF pyrolysis process is prone to agglomeration and pore collapse; (2) the amorphous carbon formed after pyrolysis of MOF represented by ZIF-8 has a lower Conductivity
Due to the single coordination structure, it is still stable above 900 °C

Method used

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  • Nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and preparation method thereof
  • Nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and preparation method thereof
  • Nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 01-12

[0028] Example 01-12 Preparation method of nitrogen-doped carbon-supported single-atom catalyst using Zn / Ni-ZIF as MOF precursor

[0029] 1) Grinding a certain amount of Zn / Ni-ZIF and glucose evenly in a mortar, in the Zn / Ni-ZIF, the molar ratio of Zn to Ni is 0.25:1.

[0030] 2) Heat the mixture obtained in 1) in a tube furnace at 5°C min -1 The heating rate is increased to the pyrolysis temperature, calcined under nitrogen atmosphere, and the temperature is naturally lowered;

[0031] 3) Post-treat the catalyst obtained in 2) in a tube furnace at 5°C min -1 The heating rate was increased to the pyrolysis temperature, calcined in an ammonia atmosphere, and the temperature was naturally lowered to obtain a nitrogen-doped carbon-supported Ni single-atom catalyst.

[0032]4) Electrochemical test: Take 4 mg of the catalyst prepared in step 3) and add it to 485 μl of alcohol, 500 μl of water and 15 μl of 0.05% Nafion mixed solution, ultrasonically disperse evenly, remove 10 μl a...

Embodiment 13-24

[0037] Example 13-24 Preparation method of nitrogen-doped carbon-supported single-atom catalyst using Zn / Ni-ZIF as MOF precursor

[0038] 1) Stir a certain amount of Zn / Ni-ZIF and glucose in an aqueous solution for 24 hours, filter and dry; in the Zn / Ni-ZIF, the molar ratio of Zn to Ni is 0.25:1.

[0039] 2) Heat the mixture obtained in 1) in a tube furnace at 5°C min -1 The heating rate is increased to the pyrolysis temperature, calcined for a certain period of time under nitrogen atmosphere, and the temperature is naturally lowered;

[0040] 3) Post-treat the catalyst obtained in 2) in a tube furnace at 5°C min -1 The heating rate was raised to the pyrolysis temperature, calcined for a certain period of time in an ammonia atmosphere, and the temperature was naturally lowered to obtain a nitrogen-doped carbon-supported Ni single-atom oxygen reduction catalyst.

[0041] 4) The electrochemical test method is the same as that of Example 01-12. The results show that the Ni-N-C...

Embodiment 25-36

[0046] Example 25-36 Preparation method of nitrogen-doped carbon-supported single-atom oxygen reduction catalyst using Zn / Co-ZIF as MOF precursor

[0047] 1) Stir a certain amount of Zn / Co-ZIF and glucose in an aqueous solution for 24 hours, filter and dry; in the Zn / Co-ZIF, the molar ratio of Zn to Co is 1:1.

[0048] 2) Heat the mixture obtained in 1) in a tube furnace at 5°C min -1 The heating rate is increased to the pyrolysis temperature, calcined for a certain period of time under nitrogen atmosphere, and the temperature is naturally lowered;

[0049] 3) Post-treat the catalyst obtained in 2) in a tube furnace at 5°C min -1 The heating rate was raised to the pyrolysis temperature, calcined for a certain period of time in an ammonia atmosphere, and the temperature was naturally lowered to obtain a nitrogen-doped carbon-supported Ni single-atom oxygen reduction catalyst.

[0050] 4) The electrochemical test method is the same as that of Example 1-12. The results show th...

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Abstract

The invention relates to a nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. Themethod is characterized in that a composite of a Zn-based bimetallic MOF and glucose is used as a precursor, the catalyst is obtained by high-temperature heat treatment and post-activation in ammoniagas, the monoatomic content is 2wt% to 4wt%, and the nitrogen doping amount is 4wt% to 15wt%. The addition of volatile Zn can increase the spatial distance of metal atomic nodes, the glucose can makea three-dimensional ZIF form a cross-linked structure, the structure and composition of a modulating material can improve the electrocatalytic activity, the nitrogen content can be further increased by post-activation treatment in the ammonia gas, and therefore, the electrochemical activity is improved. At the same time, the preparation method has the advantages of low cost, simple steps, mild conditions, good repeatability and easy mass production. The monoatomic catalyst exhibits good performance in an electrocatalytic oxygen reduction reaction (ORR) under an alkaline condition and has certain market application prospects.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to a preparation method of an electrocatalyst applied to a fuel cell cathode oxygen reduction reaction, in particular to a preparation method of a nitrogen-doped carbon-supported single-atom oxygen reduction catalyst. Background technique [0002] Due to the advantages of simple structure, environmental friendliness, high efficiency and wide application range, fuel cells are considered to be the first choice for electric vehicles, stationary power stations and other equipment. Among them, the cathodic oxygen reduction (ORR) reaction in alkaline fuel cells, as a process with relatively slow kinetics, plays a dominant role in the energy storage and conversion process of batteries. Pt-based catalysts are currently the most active and commonly used ORR catalysts, but their high price, limited resources, and poor stability seriously hinder the development of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 王爱琴钮珊珊张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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