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Nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst and preparation method thereof

A nitrogen-doped carbon and catalyst technology, applied in electrical components, battery electrodes, fuel cell-type half-cells, and primary-cell half-cells, etc. problem, to achieve the effect of simple method, excellent oxygen reduction performance, and strong operability

Active Publication Date: 2019-06-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The positive electrode of aluminum-air battery uses oxygen as the active substance, so one of the keys restricting the development of aluminum-air battery is the oxygen reduction catalyst. Noble metal catalysts, due to high cost and rarity, severely restrict the development of metal-air batteries

Method used

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  • Nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst and preparation method thereof
  • Nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst and preparation method thereof
  • Nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This implementation includes the following steps:

[0033] 1) Weigh 2.70g of dimethylimidazole and add it into 50mL of deionized water, stir for 20min, and configure solution A. Weigh 0.75mL tetraethyl orthosilicate solution, 0.30g cobalt nitrate hexahydrate, 0.0275g nickel nitrate hexahydrate and dissolve in 25mL deionized water, and weigh to form solution B. Slowly add solution B to solution A dropwise, continue to stir for more than 3 hours, centrifuge and wash the suspension several times, then dry it in an oven at 80°C for 48 hours, and cool to room temperature to obtain the precursor of the reactant.

[0034] 2) Grind the reactant precursor in step 1) into a powder, put the powder in a quartz boat, raise the temperature to 900°C at a rate of 5°C / min under a nitrogen atmosphere, and heat-treat at this temperature for 2 hours , cooled to room temperature.

[0035] 3) Dissolve the powder in 4mol / L KOH solution, wash with deionized water and absolute ethanol after 6...

Embodiment 2

[0038] This implementation includes the following steps:

[0039] 1) Weigh 3.60g of dimethylimidazole and add it into 50mL of deionized water, stir for 20min, and configure solution A. Weigh 1.0 mL of tetraethyl orthosilicate solution, 0.30 g of cobalt nitrate hexahydrate, and 0.050 g of manganese acetate tetrahydrate, dissolve them in 25 mL of deionized water, and weigh to form solution B. Slowly add solution B to solution A dropwise, continue to stir for more than 4 hours, centrifuge and wash the suspension several times, then dry it in an oven at 80°C for 24 hours, and cool to room temperature to obtain the precursor of the reactant.

[0040] 2) Grind the reactant precursor in step 1) into a powder, place the powder in a quartz boat, raise the temperature to 800°C at a rate of 10°C / min under a nitrogen atmosphere, and heat-treat at this temperature for 2 hours , cooled to room temperature.

[0041] 3) Dissolve the powder in 6mol / L KOH solution, wash with deionized water a...

Embodiment 3

[0044] This implementation includes the following steps:

[0045] 1) The acetylene black of 6 weight parts, the catalyst prepared in the embodiment 1 of 2 weight parts, the polytetrafluoroethylene emulsion (60wt%) of 2 weight parts are used for preparing catalytic layer, take ethanol as solvent respectively to solid Stir the powder evenly, then add the weighed polytetrafluoroethylene emulsion, stir and disperse evenly, and then roll and shape repeatedly under a roller press to prepare a catalytic membrane with a thickness of 1.0mm.

[0046] 2) Take by weighing 5 parts by weight of acetylene black, 1 part by weight of pore-forming agent, and 4 parts by weight of polytetrafluoroethylene emulsion (60wt%) for the preparation of a waterproof layer, using ethanol as a solvent to stir the solid powder evenly, and then Add the weighed polytetrafluoroethylene emulsion, stir and disperse evenly, and then repeatedly roll and form under the roller press to prepare a waterproof and breathabl...

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Abstract

The invention discloses a nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst and a preparation method thereof. Dimethyl imidazole is dropwise added into a mixed solution of a soluble transition metal salt and ethyl orthosilicate, and washing is carried out after a complete reaction to obtain a precipitate; drying and sintering are carried out to obtain precursor powder; and finally alkaline treatment is carried out to obtain the catalyst. The preparation method has the advantages of simple preparation method, uniform distribution of active sites, large specific surface area and the like, and is beneficial to promotion of practical application of metal air batteries.

Description

technical field [0001] The invention relates to a technology in the field of air batteries, in particular to a nitrogen-doped porous carbon-coated non-noble metal alloy composite oxygen reduction catalyst, its preparation and its application in the positive electrode of an air battery. Background technique [0002] The positive electrode of aluminum-air batteries uses oxygen as the active substance, so one of the keys restricting the development of aluminum-air batteries is the oxygen reduction catalyst. The oxygen reduction reaction is very slow in the natural state, and the reaction process must be accelerated by a catalyst. The high cost and rarity of noble metal catalysts severely restrict the development of metal-air batteries. The development of low-cost, high oxygen reduction catalytic activity non-noble metal oxygen reduction catalysts to replace the mainstream platinum-based catalysts is the only way for the development of fuel cells and metal-air batteries. Among ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/06H01M12/08B82Y30/00
CPCY02E60/10
Inventor 付超鹏蒋敏张佼孙宝德
Owner SHANGHAI JIAO TONG UNIV
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