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A kind of fecx@nc core-shell structure catalyst and preparation method thereof

A core-shell structure and catalyst technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of difficult control of chemical gas phase polymerization process conditions, difficult separation of nanofibers, poor strength, etc., to achieve large-scale production, The effect of low raw material cost and simple preparation process

Inactive Publication Date: 2019-02-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanofibers prepared by electrospinning technology are not easy to separate, the yield is low, and the strength is poor. The conditions of the chemical vapor phase polymerization process are not easy to control, so the experimental conditions still need to be further improved.

Method used

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  • A kind of fecx@nc core-shell structure catalyst and preparation method thereof
  • A kind of fecx@nc core-shell structure catalyst and preparation method thereof
  • A kind of fecx@nc core-shell structure catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: A 1 Fe 1 -G 3 -900(A 1 Fe 3 Refers to the molar mass ratio of aniline and ferric chloride in the raw material is 1:1, G 3 means that the quality of glucose is three times that of aniline, and 900 means that the pyrolysis temperature is 900°C)

[0040] Take 1.8216g of glucose and add it to a certain amount of dilute hydrochloric acid solution, ultrasonically disperse evenly, then take 0.6mL aniline and add it to the hydrochloric acid solution of glucose to ultrasonically disperse evenly, then add 7.5g SiO 2 The sol solution was stirred evenly; then the reaction was placed in an ice-water bath, and 5 mL of 1.2 mol L was added dropwise while vigorously stirring -1 Ferric chloride solution was added to the above mixed solution, and after continuous stirring for 16 hours, it was dried in an air atmosphere at 100° C. for 12 hours to obtain a precursor composite material; 2 Under atmosphere at 5°C min -1 The rate is programmed to heat up to 900°C, and the rea...

Embodiment 2

[0042] Example 2: A 1 Fe 5 -G 3 -900(A 1 Fe 5 Refers to the molar mass ratio of aniline and ferric chloride in the raw material is 1:5, G 3 means that the quality of glucose is three times that of aniline, and 900 means that the pyrolysis temperature is 900°C)

[0043] Take 1.8216g of glucose and add it to a certain amount of dilute hydrochloric acid solution, ultrasonically disperse evenly, then take 0.6mL aniline and add it to the hydrochloric acid solution of glucose to ultrasonically disperse evenly, then add 7.5g SiO 2 The sol solution was stirred evenly; then the reaction was placed in an ice-water bath, and 25 mL of 1.2 mol L was added dropwise while vigorously stirring -1 Ferric chloride solution was added to the above mixed solution, and after continuous stirring for 16 hours, it was dried in an air atmosphere at 100° C. for 12 hours to obtain a precursor composite material; 2 Under atmosphere at 5°C min -1 The rate is programmed to heat up to 900°C, and the re...

Embodiment 3

[0045] Example 3: A 1 Fe 6 -G 3 -900(A 1 Fe 6 Refers to the molar mass ratio of aniline and ferric chloride in the raw material is 1:6, G 3 means that the quality of glucose is three times that of aniline, and 900 means that the pyrolysis temperature is 900°C)

[0046] Take 1.8216g of glucose and add it to a certain amount of dilute hydrochloric acid solution, ultrasonically disperse evenly, then take 0.6mL aniline and add it to the hydrochloric acid solution of glucose to ultrasonically disperse evenly, then add 7.5g SiO 2 The sol solution was stirred evenly; then the reaction was placed in an ice-water bath, and 30 mL of 1.2 mol L was added dropwise while vigorously stirring -1 Ferric chloride solution was added to the above mixed solution, and after continuous stirring for 16 hours, it was dried in an air atmosphere at 100° C. for 12 hours to obtain a precursor composite material; 2 Under atmosphere at 5°C min -1 The rate is programmed to heat up to 900°C, and the re...

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Abstract

The invention relates to a FeCx@NC core-shell structured catalyst and a preparation method therefor. The FeCx@NC core-shell structured catalyst takes iron and FeCx nanoparticle mixture as the core, and takes nitrogen and FeCx-doped carbon as the shell, and has a mesoporous structure with a specific surface area of 500-900m<2>g<-1>. The preparation method for the core-shell structured catalyst comprises the steps of preparing a polyaniline and glucose composite material firstly; performing calcining for one time to prepare a Fe-N-C catalyst; and finally performing calcining for the second time to obtain the FeCx@NC catalyst. The catalyst is high in oxygen reduction activity and high in stability; the raw materials, such as the carbon source and the nitrogen source used by the preparation method are low in cost, so that the production cost for producing a Fe-N-C material by the conventional pyrolysis method can be lowered; meanwhile, the preparation method is simple and easy to implement; and in addition, the core-shell structured catalyst provided by the invention has relatively high electrocatalytic activity, and can be widely applied to the negative electrode catalyst of a proton exchange membrane fuel cell, an alkali negative ion exchange membrane fuel cell, and a metal air battery.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to a cathode oxygen reduction reaction electrocatalyst, in particular to an FeC x @NC core-shell structure catalyst and its preparation method. Background technique [0002] Fuel cell is a research focus of domestic and foreign scholars in recent years. However, the cathode oxygen reduction (ORR) reaction of fuel cells suffers from a slow kinetic process. At present, the best performance and most widely used fuel cell oxygen reduction catalysts are carbon-supported platinum and platinum alloy catalysts, but Pt-based electrocatalysts are poor in stability and high in price, which limits the large-scale commercial use of fuel cells. Catalysts with high catalytic activity and stability, corrosion resistance and low cost have important practical significance and application value. [0003] Metal-nitrogen-carbon materials are considered to be the most promi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/90Y02E60/50
Inventor 李光兰刘彩娣程光春袁丽芳陈文雯
Owner DALIAN UNIV OF TECH
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