Preparation method of composite structure oxygen reduction electrocatalyst for fuel cell cathode

A fuel cell cathode and composite structure technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of high price, poor stability, and low exchange current density, and achieve simple process operation, low production cost, and easy industrial production Effect

Active Publication Date: 2022-01-04
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fuel cell has many advantages, there are also shortcomings, especially the low efficiency of the cathode oxygen reduction reaction and the low exchange current density, which are the decisive steps in the overall reaction of the fuel cell. In order to improve or solve this problem, the electric The catalyst becomes an essential and important component in the electrode reaction
[0003] Traditional noble metals and their oxides, such as platinum, iridium oxide, ruthenium oxide, etc., have high catalytic activity and are recognized as the best commercial electrocatalysts. However, their shortcomings such as scarcity of reserves, high price, and poor stability severely limit their large-scale use in energy devices

Method used

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  • Preparation method of composite structure oxygen reduction electrocatalyst for fuel cell cathode
  • Preparation method of composite structure oxygen reduction electrocatalyst for fuel cell cathode
  • Preparation method of composite structure oxygen reduction electrocatalyst for fuel cell cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1) Preparation of metalloporphyrin: Take 1 mole of tetrapyridyl porphyrin, 2 moles of ferric chloride hexahydrate and 100 mL of DMF solvent in a three-necked flask under nitrogen atmosphere, magnetically stir evenly, heat up to 120 ° C, condense and reflux After 9 hours, cool down to room temperature naturally after the reaction, transfer the reacted solution to a beaker, add ultrapure water to precipitate the metalloporphyrin, then remove the solution by rotary evaporation, and place the residue in a petri dish to freeze for 8 hours. Transfer to dry 10h in freeze drier to get tetrapyridyl iron porphyrin;

[0027] 2) Preparation of composite structure: take fullerene C at a mass ratio of 1:1 70 and tetrapyridyl iron porphyrin, first prepare 2 mg / mL fullerene toluene solution, ultrasonically disperse for 10 minutes and then filter, then add tetrapyridyl iron porphyrin and ultrasonically disperse for 15 minutes to obtain a mixed solution;

[0028] 3) The above-mentioned ...

Embodiment 2

[0035] 1) Preparation of metalloporphyrin: Take 1 mole of tetrapyridyl porphyrin, 5 moles of ferric chloride hexahydrate and 120 mL of DMF solvent in a three-necked flask under nitrogen atmosphere, magnetically stir evenly, heat up to 140 ° C, condense and reflux 8h, after the reaction is finished, cool naturally to room temperature, transfer the reacted solution to a beaker, add ultrapure water to precipitate the metalloporphyrin, then use rotary evaporation to remove the solution, and place the residue in a petri dish to freeze for 12 hours. Transfer to dry 24h in freeze drier to obtain tetrapyridyl iron porphyrin;

[0036] 2) Preparation of composite structure: take fullerene C at a mass ratio of 1:2 70 and tetrapyridyl iron porphyrin, first prepare 2.5 mg / mL fullerene toluene solution, ultrasonically disperse for 15 minutes and then filter, then add tetrapyridyl iron porphyrin and ultrasonically disperse for 15 minutes to obtain a mixed solution;

[0037] 3) The above-men...

Embodiment 3

[0041] 1) Preparation of metalloporphyrin: Take 1 mole of tetrapyridyl porphyrin, 6 moles of ferric chloride hexahydrate and 150 mL of DMF solvent in a three-necked flask, stir evenly under a nitrogen atmosphere, heat up to 160 ° C, condense and reflux 7h, after the reaction is finished, cool naturally to room temperature, transfer the reacted solution to a beaker, add ultrapure water to precipitate the metalloporphyrin, then use rotary evaporation to remove the solution, and place the residue in a petri dish to freeze for 10 hours to obtain a solid Transfer to dry 24h in freeze drier to obtain tetrapyridyl iron porphyrin;

[0042] 2) Preparation of composite structure: take fullerene C at a mass ratio of 1:3 70 and tetrapyridyl iron porphyrin, first prepare 3 mg / mL fullerene toluene solution, ultrasonically disperse for 30 minutes and then filter, then add tetrapyridyl iron porphyrin and ultrasonically disperse for 10 minutes to obtain a mixed solution;

[0043] 3) The above...

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Abstract

The invention relates to a preparation method of a composite structure oxygen reduction electrocatalyst for a fuel cell cathode. The preparation method comprises the following steps: condensing and refluxing tetrapyridyl porphyrin, ferric trichloride hexahydrate and a DMF (Dimethyl Formamide) solvent, removing a solution by using rotary evaporation, putting residues into a culture dish, freezing, transferring a solid into a freeze dryer, and drying to obtain tetrapyridyl ferriporphyrin; adding fullerene C70 and tetrapyridyl ferriporphyrin into a toluene solution, and carrying out ultrasonic dispersion to obtain a mixed solution; adding isopropanol into the mixed solution, standing for reaction, then carrying out suction filtration and washing, and carrying out vacuum drying to obtain a composite sample precursor; and uniformly spreading the composite sample precursor in a magnetic boat, putting the magnetic boat into a quartz tube taking hydrogen-argon mixed gas as a protective atmosphere, keeping the temperature at 700-900 DEG C for 2-4 hours, naturally cooling to room temperature, and grinding to obtain the composite structure oxygen reduction electrocatalyst. The process is simple to operate, the selected raw materials are low in production cost, and industrial production is easy. The obtained C70 / FeTPPy composite structure is expected to become a substitute of a noble metal catalyst. And the half-wave potential can reach 0.87 V (vs.RHE).

Description

technical field [0001] The invention belongs to the technical field of energy catalysis, and in particular relates to a preparation method of a composite structure oxygen reduction electrocatalyst for fuel cell cathodes. Background technique [0002] Fuel cells are environmentally friendly, high energy conversion efficiency, easy to use, not limited by the Carnot cycle, and can directly convert chemical energy into electrical energy. They are used in aerospace, mobile equipment, transportation and other fields. Although the fuel cell has many advantages, there are also shortcomings, especially the low efficiency of the cathode oxygen reduction reaction and the low exchange current density, which are the decisive steps in the overall reaction of the fuel cell. In order to improve or solve this problem, the electric Catalyst becomes an essential and important component in the electrode reaction. [0003] Traditional noble metals and their oxides, such as platinum, iridium oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/9008H01M4/88Y02E60/50
Inventor 曹丽云王海冯永强黄剑锋冯伟航陈俊生胡郁竹袁成科
Owner SHAANXI UNIV OF SCI & TECH
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