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Preparation method and application of ionic liquid modified nitrogen-sulfur co-doped graphene oxide composite material

A nitrogen-sulfur co-doping and graphene composite technology is applied in chemical instruments and methods, catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, etc. and other problems, to achieve the effects of mild synthesis conditions, good oxygen reduction catalytic activity, and cost reduction

Active Publication Date: 2020-06-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the working efficiency of a fuel cell largely depends on the rate of the oxygen reduction reaction on its cathode. The current catalysts that catalyze this reaction need to use a large amount of scarce precious metal Pt, and its high price prevents the popularization of fuel cells.

Method used

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  • Preparation method and application of ionic liquid modified nitrogen-sulfur co-doped graphene oxide composite material
  • Preparation method and application of ionic liquid modified nitrogen-sulfur co-doped graphene oxide composite material
  • Preparation method and application of ionic liquid modified nitrogen-sulfur co-doped graphene oxide composite material

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Experimental program
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Embodiment 1

[0030] 1. Synthesis of Ionic Liquids

[0031] Get N-methylimidazole 0.05mol (4.1g) and 3-bromopropylamine hydrobromide 0.04mol (8.76g) and mix in reactor, add 100ml dehydrated alcohol solvent and it is dissolved, in N 2 Under protection, place in an oil bath and heat to 78°C, stir and reflux for 24 hours to obtain a light yellow solution. Purify the obtained crude product by a rotary evaporator to obtain a viscous liquid, then add water to dissolve all the rotary evaporated material, and adjust the pH to 11 with KOH to restore the protected amino group, distill under reduced pressure, and wash The finished product was placed in a vacuum drying oven, heated to 80°C, dried for 4 hours, and vacuum-dried to constant weight. After drying, it was taken out into a light yellow viscous paste, and 50 mL of a mixture of ethanol and tetrahydrofuran was added (ethanol: tetrahydrofuran = 4:1 ), after stirring and dissolving, the product was extracted by distillation under reduced pressure...

Embodiment 2

[0038] 1. Synthesis of Ionic Liquids

[0039] Get 0.05mol (4.1g) of 1-vinylimidazole and 0.04mol (8.76g) of 3-bromopropylamine hydrobromide and mix in the reactor, add 100ml dehydrated alcohol solvent and it is dissolved, in N 2Under protection, place in an oil bath and heat to 78°C, stir and reflux for 24 hours to obtain a light yellow solution. Purify the obtained crude product by a rotary evaporator to obtain a viscous liquid, then add water to dissolve all the rotary evaporated material, and adjust the pH to 11 with KOH to restore the protected amino group, distill under reduced pressure, and wash The finished product was placed in a vacuum drying oven, heated to 80°C, dried for 4 hours, and vacuum-dried to constant weight. After drying, it was taken out into a light yellow viscous paste, and 50 mL of a mixture of ethanol and tetrahydrofuran was added (ethanol: tetrahydrofuran = 4:1 ), after stirring and dissolving, the product was extracted by distillation under reduced ...

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Abstract

The invention relates to a preparation method of an ionic liquid modified nitrogen-sulfur co-doped graphene oxide composite material. The method comprises the following steps: preparing a dispersion liquid from graphene oxide and deionized water, then mixing 1-aminopropyl-3-alkyl imidazole bromide salt, potassium hydroxide and the graphene oxide dispersion liquid, carrying out a reaction process to obtain a 1-aminopropyl-3-alkyl imidazole bromide salt and graphene oxide composite product, then mixing the product with thiourea, adding a solvent to dissolve the mixture, and reacting at 160-200 DEG C to obtain the composite material. The composite material is loaded on a cathode electrode to serve as a catalyst. The material obtained by the invention has good oxygen reduction catalytic activity and a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of graphene oxide composite materials, in particular to a graphene oxide composite material modified by an ionic liquid, more specifically to a preparation method and a composite material of a nitrogen-sulfur co-doped graphene oxide modified by an ionic liquid Application as an oxygen reduction catalyst. Background technique [0002] Fuel cells adopt an efficient energy conversion method to directly convert chemical energy into electrical energy, and the reaction process is free of pollutants. It is regarded as one of the most promising new energy sources in the 21st century. However, the working efficiency of a fuel cell largely depends on the rate of the oxygen reduction reaction on its cathode. Currently, catalysts that catalyze this reaction require a large amount of scarce precious metal Pt, and its high price prevents the popularization of fuel cells. Therefore, it is necessary to develop an efficient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J27/24B01J35/00B01J37/10B01J37/20H01M4/88H01M4/96
CPCB01J31/0295B01J31/0284B01J27/24B01J37/10B01J37/20H01M4/88H01M4/96B01J35/33Y02E60/50
Inventor 张文林张永康杨双丞杨德新李浩于丰收李春利
Owner HEBEI UNIV OF TECH
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