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Oxygen reduction catalyst for fuel cell cathode and preparation method of ordered electrode thereof

A fuel cell cathode and catalyst technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of short life, high cost of noble metal catalysts, etc., and achieve the effect of large specific surface area and smooth gas-liquid transmission

Active Publication Date: 2019-04-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of high cost and short service life of noble metal catalysts in fuel cells, the present invention proposes an oxygen reduction catalyst for fuel cell cathode oxygen reduction reaction, whose oxygen reduction performance is comparable to that of Pt in both acidic and alkaline systems. Catalyst equivalent performance

Method used

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  • Oxygen reduction catalyst for fuel cell cathode and preparation method of ordered electrode thereof
  • Oxygen reduction catalyst for fuel cell cathode and preparation method of ordered electrode thereof
  • Oxygen reduction catalyst for fuel cell cathode and preparation method of ordered electrode thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Dissolve 5.0 g of sucrose in 20 ml of water, add 5.0 g of silica microspheres with a particle size of about 150 nm under stirring, continue stirring for 40 minutes, filter with suction, and dry under vacuum at 80°C for 12 hours to obtain a white cohesive solid. Take 2.0 g of the white solid in a ceramic ark, place it in a high-temperature tube furnace, and under the protection of Ar, raise the temperature to 900 °C for 1 hour at 5 °C / min to obtain a black powder, which is carbon-coated silica microspheres. The black powder was treated with 3M NaOH at 80° C. for 24 hours, then suction-filtered, washed with water, and vacuum-dried at 80° C. to obtain hollow carbon spheres.

[0041] Get 40mg of hollow carbon spheres and disperse them in 80ml of pH=8 tromethamine (tris) buffer solution, add 160mg of dopamine and 216mg of FeCl 3 ·6H 2 O, stirred for 6 hours, suction filtered, washed with water, vacuum dried at 80°C, placed in a high-temperature tube furnace, and under the p...

Embodiment 2

[0044] Add 10.0 g of sucrose into 50 ml of water and stir vigorously to dissolve it. Add 5.0 g of silica microspheres with a particle diameter of about 500 nm, continue stirring for 40 minutes, centrifuge, and vacuum dry at 70° C. for 12 hours to obtain a white cohesive solid. Get 2.0g of this white solid in high temperature tube furnace, under N 2 Under protection, the temperature was raised to 900° C. at 3° C. / min, and kept for 2 hours to obtain carbon-coated silica microspheres. The product was added with 10wt.% hydrofluoric acid, stirred overnight, filtered with suction, washed with hot water, and dried in vacuum at 80°C to obtain three-dimensionally interconnected hollow carbon spheres.

[0045] Get 100mg hollow carbon spheres and disperse them in 80ml pH=8 tromethamine (tris) buffer solution, add 160mg dopamine and 216mg FeCl 3 ·6H 2 O, stirred for 6 hours, filtered with suction, washed with water, and dried under vacuum at 60°C for later use. The dried product was p...

Embodiment 3

[0047] Add 5.0g of silica microspheres with a particle size of about 500nm into the 20ml phenolic resin reaction solution prepared in advance, stir overnight, transfer to a hydrothermal kettle, heat at 130°C for 6 hours, centrifuge, and vacuum dry at 70°C for 12 hours. A brown product was obtained. Get 2.0g of this product in the high temperature tube furnace, under N 2 Under protection, the temperature was raised to 1000° C. at 5° C. / min and kept for 5 hours to obtain carbon-coated silica microspheres. Grind the product into a fine powder, add 10wt.% hydrofluoric acid, stir overnight, filter with suction, wash with hot water, and dry in vacuum at 80°C to obtain hollow carbon spheres.

[0048] Take 200 mg of hollow carbon spheres and 50 mg of iron phthalocyanine, mix them evenly with a ball mill, transfer them to a ceramic ark, place them in a high-temperature tube furnace, and raise the temperature to 800 °C at 5 °C / min for 5 hours under the protection of Ar to obtain the O...

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Abstract

The invention discloses an oxygen reduction catalyst for a cathode of a fuel cell and a preparation method of an ordered electrode of the fuel cell. An iron-nitrogen-carbon composite material with high oxygen reduction activity is obtained by adopting silica microspheres as a hard template, adding a carbon source, carrying out high-temperature treatment in an inert atmosphere or ammonia atmosphere, etching the template to obtain 3D interconnected hollow carbon spheres and further introducing an iron source and a nitrogen source. The iron-nitrogen-carbon composite material prepared by the method has the characteristics of being hierarchical, porous, uniform in catalytic active site distribution, high in specific surface area, and good in oxygen reduction property in an acid-base system. The method further comprises the following steps: a silica template is uniformly deposited on carbon paper, and then an integral electrode is constructed in situ by employing the preparation method of the iron-nitrogen-carbon composite material. The iron-nitrogen-carbon hollow interconnection structure in the electrode is regularly arranged and has a good transmission channel for multiple substances of electrons, protons, electrolytes, gases and the like; and the utilization rate of catalytic active sites is greatly improved, thereby improving the oxygen reduction property of the electrode. The electrode has better oxygen reduction reaction electrocatalytic activity than the electrode prepared by a traditional spraying method.

Description

technical field [0001] The invention relates to an oxygen reduction catalyst, which belongs to the field of proton exchange membrane fuel cells, in particular to a non-noble metal catalyst used for fuel cell cathode oxygen reduction reaction and preparation of ordered electrodes thereof. Background technique [0002] Cathode oxygen reduction reaction (Oxygen reduction reaction, ORR) is one of the key components of fuel cells, but its kinetic process is slow, the overpotential is high, and its stability is poor. Excellent ORR electrocatalysts are needed to ensure the performance of fuel cells. Therefore, the development of ORR electrocatalysts with excellent performance is a hot spot and focus in the field of fuel cell research. At present, the ORR electrocatalyst mainly uses noble metal platinum or platinum ruthenium as the catalyst, but the noble metal platinum or platinum ruthenium catalyst has serious problems such as high price, poor stability, and easy poisoning. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8853H01M4/9016H01M4/9041H01M4/9083Y02E60/50
Inventor 宋树芹吴明媚王毅
Owner SUN YAT SEN UNIV
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