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Iron and nitrogen co-doped carbon oxygen reduction catalyst and preparation method thereof

A catalyst and co-doping technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as hindering the widespread commercialization of fuel cell technology, high price of platinum-based catalysts, and deterioration of nanoparticle performance, and accelerate the oxygen reduction reaction. The effect of speed, process optimization, rich pore structure

Active Publication Date: 2019-12-03
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But platinum-based catalysts are expensive, unsustainable in supply, poor in durability, and susceptible to methanol crossover and CO poisoning
Furthermore, corrosion of carbon, dissolution of platinum, maturation and exfoliation of nanoparticles lead to deterioration of performance over time
These serious issues have hindered the widespread commercialization of fuel cell technology

Method used

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  • Iron and nitrogen co-doped carbon oxygen reduction catalyst and preparation method thereof
  • Iron and nitrogen co-doped carbon oxygen reduction catalyst and preparation method thereof
  • Iron and nitrogen co-doped carbon oxygen reduction catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038]An iron-nitrogen co-doped carbon-oxygen reduction catalyst, which uses a mixture of iron nitrate nonahydrate, guanidine hydrochloride and Ketjen black nano-carbon black particles as a precursor to prepare iron and nitrogen co-doped carbon-oxygen by high-temperature pyrolysis Catalyst reduction comprises the steps of:

[0039] (1) Dissolve 0.2g of Ketjen Black nano-carbon black particles as a carbon carrier in 50ml of organic solvent ethanol, ultrasonically dissolve and disperse evenly, add ferric nitrate under stirring conditions, mix thoroughly to obtain a mixed solution, and then transfer to the reaction kettle , the reaction kettle was placed at room temperature and stirred for 24 hours, vacuum filtered and repeatedly washed with organic solvent ethanol, then dried, mixed and ground after adding nitrogen source guanidine hydrochloride to obtain a pyrolysis precursor; wherein, the concentration of ferric nitrate in the solution was 0.1mol·L -1 , the amount of guanidin...

Embodiment 2

[0043] This example is an iron and nitrogen co-doped carbon-oxygen reduction catalyst, which adopts a preparation process similar to that of Example 1, except that the reaction temperature is increased to 900° C. during the process of pyrolyzing the precursor.

[0044] Characterize the structure of the catalyst to obtain its XRD pattern, such as Figure 4 as shown, Figure 4 It shows that the prepared catalyst contains a lot of Fe 3 C; Further test the oxygen reduction performance of the catalyst prepared by pyrolysis carbonization, such as Figure 5 Shown, show that this catalyst has the electrocatalytic activity that is better than commercial Ketjen black nano-carbon black particle, half-wave potential exceeds 114mV; Close to the electrocatalytic activity of commercial Pt / C catalyst, half-wave potential differs 54mV, compares embodiment 1 decreased by 1mV, and the electrochemical stability is better than commercial 20%Pt / C.

Embodiment 3

[0046] This example is an iron and nitrogen co-doped carbon-oxygen reduction catalyst. The preparation process of this catalyst is similar to that of Example 1, except that the reaction temperature drops to 700° C. during the process of pyrolyzing the precursor.

[0047] Characterize the structure of the catalyst to obtain its XRD pattern, such as Image 6 As shown, the iron and nitrogen co-doped carbon catalysts prepared by pyrolytic carbonization exhibited a large amount of Fe 2 The map structure of the C active site; further test the oxygen reduction performance of the catalyst prepared by pyrolysis carbonization, such as Figure 7 As shown, it is shown that the catalyst has electrocatalytic activity superior to commercial Ketjen black nano-carbon black particles, and the half-wave potential exceeds 45mV; it has an electrocatalytic activity close to that of commercial 20% Pt / C, and the half-wave potential difference is 123mV, compared with Example 1 drops 70mV.

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Abstract

The invention relates to an iron and nitrogen co-doped carbon oxygen reduction catalyst. The preparation method comprises steps: a carbon carrier is dissolved in an organic solvent, ultrasonic dispersion for being uniform is carried out, soluble iron salt is added under a stirring condition, and after uniform mixing, a mixed solution is obtained; the mixed solution is transferred to a reaction kettle, a reaction is carried out under the stirring condition, the reaction solution after the reaction is subjected to solid-liquid separation, washing and drying to obtain a solid material, the solidmaterial and a nitrogen source are mixed and grinded, and a pyrolysis precursor is obtained; and the pyrolysis precursor is roasted in an inert atmosphere to obtain the iron and nitrogen co-doped carbon oxygen reduction catalyst, wherein the carbon carrier is Ketjen black nano carbon black particles. Compared with the prior art, the method has the advantages of high oxidation reduction catalytic activity, good electrochemical stability, simple and controllable preparation method, short period, rich raw material reserves, low cost, capability of realizing large-scale production and the like.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to an iron and nitrogen co-doped carbon-oxygen reduction catalyst and a preparation method thereof. Background technique [0002] With its high power density, high efficiency, environmental protection and reliability, fuel cells show broad prospects for replacing fossil fuels. Electrochemical oxygen reduction plays an important role in these renewable energy conversion systems. The energy barrier of the fuel cell cathode oxygen reduction reaction is relatively high, and an efficient catalyst is required to reduce the activation energy of the reaction and increase the reaction rate. This reaction requires efficient catalysts, in which noble metal platinum-based materials are the main ones. However, platinum-based catalysts are expensive, unsustainable in supply, poor in durability, and susceptible to methanol crossover and CO poisoning. In addition, corrosion of carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/96
CPCH01M4/8652H01M4/96H01M4/8882Y02E60/50
Inventor 刘建峰丁昇宁锴李敏袁斌霞王道累
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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