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Fuel cell oxygen reduction catalyst with high performance and low pt loading and preparation method thereof

A fuel cell, high-performance technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high raw material prices, low utilization rate of precious metals, complicated preparation methods, etc., and achieve easy operation, excellent electrochemical performance, and production short cycle effect

Active Publication Date: 2021-09-07
吉林省源田能源科技服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of complex preparation methods, high raw material prices, and low utilization rate of precious metals in the preparation of platinum-based catalysts in the prior art, and provides a fuel cell oxygen reduction catalyst with high performance and low Pt loading and a preparation method thereof. The method provided by the invention has simple operation and mild conditions, and can obtain a supported platinum catalyst with low platinum loading, high activity and high platinum utilization rate

Method used

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  • Fuel cell oxygen reduction catalyst with high performance and low pt loading and preparation method thereof
  • Fuel cell oxygen reduction catalyst with high performance and low pt loading and preparation method thereof
  • Fuel cell oxygen reduction catalyst with high performance and low pt loading and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] (1) Add 0.316g of ellagic acid and 0.46g of zinc acetate dihydrate into a beaker containing 50mL of N-methylpyrrolidone, ultrasonicate for 30min, stir for 60min, centrifuge and dry at 55°C to obtain 0.53g of product, the prepared carrier Labeled Zn-MOF.

[0042] (2) Weigh 530 mg of Zn-MOF prepared in step (1), add it into a beaker containing 100 mL of ethanol, and add chloroplatinic acid hexahydrate (13 mg of chloroplatinic acid hexahydrate) containing 5 mg of platinum at the same time, after ultrasonication for 30 min Stir for 5h, dry by rotary evaporation at 65°C, then place the product in a quartz boat and place it in a tube furnace under argon hydrogen (Ar:H 2 =9:1) Calcination at 950°C for 60min in a mixed atmosphere, tube furnace at room temperature at 5°Cmin -1The heating rate is raised to 950°C, and the prepared catalyst is marked as PtZn / C, wherein the mass percentage of platinum in the catalyst is 5%, and the catalyst is analyzed by TEM and SEM (such as Fig...

Embodiment 2

[0052] (1) Add 0.316g of ellagic acid and 0.46g of zinc acetate dihydrate into a beaker containing 50mL of N-methylpyrrolidone, ultrasonicate for 30min, stir for 60min, centrifuge and dry at 55°C to obtain 0.53g of product, the prepared carrier Labeled Zn-MOF.

[0053] (2) Weigh 530 mg of Zn-MOF prepared in step (1), add it into a beaker containing 100 mL of ethanol, and add different masses of chloroplatinic acid hexahydrate (according to the mass percentage of Pt in the catalyst is 2.8 %, 4.0%, and 6.0% were added with chloroplatinic acid hexahydrate), stirred for 5 h after ultrasonication for 30 min, and dried by rotary evaporation at 65 ° C. Then, the product was added to a quartz boat and placed in a tube furnace. Ar: H 2 =9:1) Calcination at 950°C for 60min in a mixed atmosphere, tube furnace at room temperature at 5°Cmin -1 The heating rate is increased to 950°C, and the prepared catalyst is marked as PtZn / C-x%.

[0054] (3) Add 50 μL of Aldrich’s Nafion solution wit...

Embodiment 3

[0056] (1) Add 0.316g of ellagic acid and 0.46g of zinc acetate dihydrate into a beaker containing 50mL of N-methylpyrrolidone, ultrasonicate for 30min, stir for 60min, centrifuge and dry at 55°C to obtain 0.53g of product, the prepared carrier Labeled Zn-MOF.

[0057] (2) Weigh 530 mg of Zn-MOF prepared in step (1), and then place the product in a quartz boat and place it in a tube furnace under argon hydrogen (Ar:H 2 =9:1) Calcination at 950°C for 60min in a mixed atmosphere, tube furnace at room temperature at 5°Cmin -1 The heating rate was increased to 950°C, and the prepared catalyst was labeled as MOF-C.

[0058] (3) Add 50 μL of Nafion solution with a mass fraction of 5% produced by Aldrich to a beaker containing 950 μL of ethanol solution, then add 5 mg of the MOF-C catalyst prepared in step (2), and disperse it ultrasonically for 30 minutes to obtain a mixed solution ; 18 μ L of the above solution was drip-coated on a glassy carbon electrode, and after drying at roo...

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Abstract

The invention relates to a fuel cell oxygen reduction catalyst with high performance and low Pt loading and a preparation method thereof, belonging to the technical field of fuel cells. The method solves the technical problems of complex preparation methods, high raw material prices and low utilization rate of precious metals existing in the preparation of platinum-based catalysts in the prior art. The preparation method of the present invention comprises the following steps: dispersing ellagic acid and zinc acetate dihydrate in N-methylpyrrolidone, ultrasonically dispersing, stirring and centrifuging, and drying to obtain the carrier; dispersing the carrier and chloroplatinic acid hexahydrate in water, After ultrasonic dispersion and stirring, the water is evaporated to dryness to obtain a composite carrier; the composite carrier is reduced under the protection of argon-hydrogen mixed gas, and the obtained product is finely ground to obtain a supported platinum catalyst. The invention also provides a prepared catalyst. The catalyst prepared by the invention has excellent electrochemical performance, and the treatment method is easy to operate, and the production period is short; while the electrochemical performance is obviously improved, the loading capacity of the precious metal platinum is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell oxygen reduction catalyst with high performance and low Pt loading and a preparation method thereof. Background technique [0002] As a clean and efficient energy conversion device, fuel cells have been extensively studied for decades. In the face of the global energy crisis, fuel cells have attracted widespread attention as an energy conversion device, and people hope to meet the global energy demand through the use of fuel cells. In various types of fuel cells, the improvement of energy density has been limited by the slow oxygen reduction rate of the cathode, and the lack of catalyst stability makes the fuel cell performance decay too fast, so the preparation of highly active and stable cathode catalysts have a broad vision of application. [0003] However, the commercial application of fuel cells still faces many problems. For example, the cathod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/921H01M4/925H01M4/926Y02E60/50
Inventor 沈亮宏赵拓华欣欣荆力华王一张凤
Owner 吉林省源田能源科技服务有限公司
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