Preparation method of high-activity electrochemical oxygen reduction catalyst

A catalyst and electrochemical technology, applied in the field of preparation of high-activity electrochemical oxygen reduction catalysts, can solve the problems of hindering electrochemical oxygen reduction efficiency, poor electrical conductivity of iron phthalocyanine, unable to maintain stability, etc., and achieve high electrochemical oxygen reduction. Effects of reduction efficiency, low cost of raw materials, and good electrochemical stability

Inactive Publication Date: 2020-07-03
CENT SOUTH UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, the existing iron phthalocyanine electrochemical oxygen reduction catalyst mainly has the following two problems: during the reaction process, iron phthalocyanine will agglomerate and cannot maintain stability for a long time; the conductivity of iron phthalocyanine is very poor, and the resistance is very high , hindering the further improvement of the electrochemical oxygen reduction efficiency
Therefore, iron phthalocyanine cannot surpass the existing commercialized platinum-based catalysts, so a special treatment method is needed to further improve the activity of iron phthalocyanine

Method used

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  • Preparation method of high-activity electrochemical oxygen reduction catalyst
  • Preparation method of high-activity electrochemical oxygen reduction catalyst
  • Preparation method of high-activity electrochemical oxygen reduction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, first take 5 mg of iron phthalocyanine and add it to 80 ml of N,N-dimethylformamide, ultrasonic for 1 hour at a speed of 500 r min -1 , stirred for 30 minutes to completely dissolve the iron phthalocyanine, so that there is no precipitation in the organic solvent; then take 35 mg of acetylene black bombarded by oxygen plasma (process parameters are as follows: power 90W, time 40min) and add it, keep it sealed, and rotate at a speed of 500r min -1 , stirred for 35 hours, reacted fully, let the phthalocyanine material adsorb on the conductive material, separated the solid black substance in the solution by suction filtration, washed it with deionized water and ethanol for several times, and opened it under the condition of 60°C After standing for 9 hours to dry, a black solid powder catalyst was obtained, that is, the highly active electrochemical oxygen reduction catalyst. In this embodiment, in terms of mass percentage, the content of phthalocyanine in ...

Embodiment 2

[0034] In this example, first take 8 mg of iron phthalocyanine and add it to 90 ml of N,N-dimethylformamide, ultrasonic for 1 hour at a speed of 500 r min -1 , stirred for 1h, iron phthalocyanine was completely dissolved, and there was no precipitation in the organic solvent; then 40mg of Ketjen black was added after oxygen plasma bombardment (process parameters were as follows: power 100W, time 35min), kept sealed, and the speed was 500r. min -1, stirred for 30 hours, fully reacted, let the phthalocyanine material adsorb on the conductive material, separated the solid black substance in the solution by suction filtration, washed it with deionized water and ethanol for several times, and opened it under the condition of 50 ℃ After standing for 10 h to dry, a black solid powder catalyst was obtained, that is, the highly active electrochemical oxygen reduction catalyst. In this embodiment, in terms of mass percentage, the content of phthalocyanine in the composition of the blac...

Embodiment 3

[0036] In this example, first take 5 mg of iron phthalocyanine and add it to 80 ml of N,N-dimethylformamide, ultrasonic for 1 hour at a speed of 500 r min -1 , stirred for 1h to completely dissolve the iron phthalocyanine, so that there is no precipitation in the organic solvent; then take 40mg of graphene bombarded by oxygen plasma (process parameters are as follows: power 70W, time 30min) and add it, keep it sealed, and rotate at a speed of 500r min -1 , stirred for 40 hours, fully reacted, let the phthalocyanine material adsorb on the conductive material, separated the solid black substance in the solution by suction filtration, washed it with deionized water and ethanol for several times, and opened it under the condition of 70 ℃ After standing for 8 hours to dry, a black solid powder catalyst was obtained, that is, the highly active electrochemical oxygen reduction catalyst. In this embodiment, in terms of mass percentage, the content of phthalocyanine in the composition ...

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Abstract

The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method of a high-activity electrochemical oxygen reduction catalyst. The preparation method comprises the following steps: ultrasonically stirring and dissolving a phthalocyanine material in an organic solvent, loading the phthalocyanine material on a specially treated conductive materialin an organic matter leaching manner, filtering, and cleaning to obtain the high-activity electrochemical oxygen reduction catalyst. According to the invention, the preparation method of the high-activity electrochemical oxygen reduction catalyst is developed, and the obtained electrochemical oxygen reduction catalyst has excellent electrochemical performance; the method is low in raw material cost, simple in reaction process, low in experimental operation difficulty, good in experimental repeatability and free of additives difficult to remove; and the prepared high-activity electrochemical oxygen reduction catalyst has high electrochemical oxygen reduction efficiency and good electrochemical stability, and can achieve the half-wave potential of 0.9 V compared with the traditional commercial Pt/C (0.86 V) under the same condition.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysis, and in particular relates to a preparation method of a highly active electrochemical oxygen reduction catalyst. Background technique [0002] Proton exchange membrane fuel cells have received widespread attention in recent years because of their high energy density, high energy conversion efficiency, low emissions and even no pollution. However, the slow electrochemical oxygen reduction reaction has largely limited the development of batteries. The activity of reduction catalyst is the most important factor to promote the development of proton exchange membrane fuel cells. Among the existing oxygen reduction catalysts, platinum-based catalysts are traditionally used noble metal catalysts, which have high conversion efficiency, but at the same time, there is a problem that the high-efficiency catalytic reaction cannot be kept stable for a long time. There is another equally serious pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/10
CPCH01M4/8825H01M4/9008H01M4/9083H01M8/10Y02E60/50
Inventor 刘敏陈国柱陈克军李佳行
Owner CENT SOUTH UNIV
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