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Metal nitrogen-carbon loaded low-platinum ordered alloy composite catalyst and preparation method thereof

An ordered alloy, metal nitrogen technology, applied in the field of proton exchange membrane fuel cell catalysts, can solve the problems of complex steps, poor durability, poor ORR activity, etc., to improve catalytic activity, improve catalytic activity and stability, and improve stability. Effect

Pending Publication Date: 2022-03-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another strategy is to develop platinum-group metal-free catalysts. At present, the most mature research is the metal nitrogen-carbon structure, which has the advantages of low cost and strong structure regulation, but poor ORR activity and poor durability are the most fatal problems.
The synthesis of composite catalysts usually requires the synthesis of the carrier first, and then the loading of Pt. The steps are complicated.

Method used

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  • Metal nitrogen-carbon loaded low-platinum ordered alloy composite catalyst and preparation method thereof
  • Metal nitrogen-carbon loaded low-platinum ordered alloy composite catalyst and preparation method thereof
  • Metal nitrogen-carbon loaded low-platinum ordered alloy composite catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The PtFe@FeNC composite catalyst of the present invention includes FeNC and a PtFe alloy supported on FeNC, wherein the content of platinum is 2.0%; as figure 1 As shown, the specific preparation steps are as follows:

[0034] (1) Add 4.4 mg of platinum (II) acetylacetonate, 33.5 mg of iron (III) acetylacetonate, and 140 mg of porphyrin to chloroform, and ultrasonically disperse the solution evenly, then add 75 mg of EC-600 conductive carbon black, and ultrasonically obtain a mixture homogeneous solution;

[0035] (2) The above solution is subjected to rotary evaporation treatment, and the solvent is removed, and then dried naturally overnight; the above dried sample is ground into powder, and the temperature is raised to 900°C at a rate of 5°C / min under a nitrogen atmosphere, and the temperature is kept for 2 hours. , naturally cooled to room temperature;

[0036] (3) The above annealed sample was heated in 0.5M H 2 SO 4 After pickling in the solution and suction f...

Embodiment 2

[0038] The PtCo@CoNC composite catalyst of the present invention includes CoNC and a PtCo alloy supported on CoNC, wherein the content of platinum is 5.8%; the specific preparation steps are as follows:

[0039] (1) Add 10 mg of platinum (II) acetylacetonate, 51.4 mg of cobalt (II) acetylacetonate, and 140 mg of porphyrin to chloroform, and ultrasonically disperse the solution evenly, then add 75 mg of EC-600 conductive carbon black, and mix uniformly by ultrasonic The solution;

[0040] (2) The above solution is subjected to rotary evaporation treatment, and the solvent is removed, and then dried naturally overnight; the above dried sample is ground into powder, and the temperature is raised to 900°C at a rate of 5°C / min under a nitrogen atmosphere, and the temperature is kept for 2 hours. , naturally cooled to room temperature;

[0041] (3) The above annealed sample was heated in 0.5M H 2 SO 4 After pickling in the solution and suction filtration, it was naturally dried o...

Embodiment 3

[0043] The PtNi@NiNC composite catalyst of the present invention includes NiNC and a PtNi alloy supported on NiNC, wherein the content of platinum is 8.6%; the specific preparation steps are as follows:

[0044] (1) Add 17.6 mg of platinum (II) acetylacetonate, 51.3 mg of nickel (II) acetylacetonate, and 140 mg of porphyrin to chloroform, and ultrasonically disperse the solution evenly, then add 75 mg of EC-600 conductive carbon black, and ultrasonically obtain a mixture homogeneous solution;

[0045] (2) The above solution is subjected to rotary evaporation treatment, and the solvent is removed, and then dried naturally overnight; the above dried sample is ground into powder, and the temperature is raised to 900°C at a rate of 5°C / min under a nitrogen atmosphere, and the temperature is kept for 2 hours. , naturally cooled to room temperature;

[0046] (3) The above annealed sample was heated in 0.5M H 2 SO 4After pickling in the solution and suction filtration, dry natural...

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Abstract

The invention discloses a metal nitrogen and carbon loaded low-platinum ordered alloy composite catalyst and a preparation method thereof, the composite catalyst comprises metal nitrogen and carbon and platinum alloy loaded on the metal nitrogen and carbon, the metal element in the metal nitrogen and carbon is one or more of iron, cobalt, nickel, copper and manganese; the platinum alloy comprises 2.0-8.6% of platinum and the balance of one or more elements of iron, cobalt, nickel, copper and manganese. The low-platinum-loading-capacity platinum-based ordered alloy loaded on metal nitrogen carbon is successfully prepared by regulating and controlling parameters such as heat treatment temperature, a nitrogen source and a carbon carrier. The metal nitrogen-carbon loaded platinum-iron ordered alloy composite catalyst prepared by the method shows excellent oxygen reduction activity and stability, the mass activity of the metal nitrogen-carbon loaded platinum-iron ordered alloy composite catalyst under the acidic condition of 0.9 V is 3 times that of commercial platinum-carbon, the mass activity of the metal nitrogen-carbon loaded platinum-iron ordered alloy composite catalyst under the alkaline condition is 6.9 times that of commercial platinum-carbon, and the performance of the metal nitrogen-carbon loaded platinum-iron ordered alloy composite catalyst keeps 82.55% of an initial value after 30000 circles of stability tests. The composite catalyst can be used for preparing a low-platinum membrane electrode of a fuel cell.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cell catalysts, in particular to a metal nitrogen carbon supported low-platinum ordered alloy composite catalyst and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical power generation device that does not need to go through the Carnot cycle, and has the advantages of cleanliness, high efficiency, and high energy conversion rate. However, the slow kinetics of the cathodic oxygen reduction reaction during energy conversion severely hinders the overall efficiency of fuel cells. In the current research, platinum-based catalysts are the only metal catalysts that exhibit good performance and durability in acidic media, but the high price and low reserves of platinum limit its large-scale commercial application. [0003] In order to reduce the amount of precious metal platinum and improve the utilization rate of platinum, the solution strategies us...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88H01M8/10
CPCH01M4/926H01M4/921H01M4/8882H01M8/10
Inventor 刘建国袁梦晨李佳李晓克吴永康
Owner NANJING UNIV
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