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Manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction, preparation method of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst and application of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst

A technology of manganese dioxide and graphene, applied in the direction of fuel cell half-cells and primary battery half-cells, fuel cell half-cells and secondary battery-type half-cells, electrical components, etc., can solve oxygen Reduction reaction kinetics is slow and other problems, to achieve excellent catalytic activity, reduce manufacturing costs, and low cost effects

Inactive Publication Date: 2020-06-26
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method shows great practical value in solving the slow kinetics of oxygen reduction reaction in fuel cells and reducing the cost of fuel cells

Method used

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  • Manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction, preparation method of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst and application of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst
  • Manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction, preparation method of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst and application of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst
  • Manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction, preparation method of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst and application of manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst

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Embodiment 1

[0036] The steps of preparing manganese dioxide-loaded nitrogen-sulfur double-doped graphene catalyst are as follows:

[0037] The graphite oxide stock solution was prepared by using the existing Hummers modification method in the prior art, and the graphene oxide with a mass concentration of 4.4 mg / mL was obtained by centrifugation and stripping with ultrapure water. Measure 48 mL of graphene oxide, centrifuge for 10 min in a centrifuge, pour off the upper layer of the centrifuged liquid, pour the lower graphene oxide into a measuring cylinder, add 50 mL of organic solvent N-methylpyrrolidone, then weigh 2 g of thiourea, and Mix graphene oxide and organic solvent evenly, put it into a hydrothermal reaction kettle, and reduce it with nitrogen in a vacuum drying oven at 80°C for 24 hours. After the reduction, take the graphene out of the reaction kettle, cool and wash it, and put the The co-doped reduced graphene oxide suspension, manganese chloride tetrahydrate and potassium p...

Embodiment 2

[0043] The steps of preparing manganese dioxide-loaded nitrogen-sulfur double-doped graphene catalyst are as follows:

[0044] The graphite oxide precursor was prepared by the existing Hummers modification method in the prior art, and the graphene oxide with a mass concentration of 4.4 mg / mL was obtained by centrifugation and stripping with ultrapure water. Measure 48mL of graphene oxide, centrifuge for 10min in a centrifuge, pour off the upper clear water of the centrifugation solution, pour the lower graphene oxide into a measuring cylinder, add 50mL of organic solvent N-methylpyrrolidone, weigh 2g of thiourea, and Mix graphene and organic solvent evenly, put it into a hydrothermal reaction kettle, and reduce it with nitrogen in a vacuum drying oven at 80 °C for 24 hours. The doped reduced graphene oxide suspension, manganese chloride tetrahydrate and potassium permanganate were mixed and stirred according to the mass ratio of 1:10:20, and the stirring was continued for 30 m...

Embodiment 3

[0050] The steps of preparing manganese dioxide-loaded nitrogen-sulfur double-doped graphene catalyst are as follows:

[0051] The graphite oxide precursor was prepared by the existing Hummers modification method in the prior art, and the graphene oxide with a mass concentration of 4.4 mg / mL was obtained by centrifugation and stripping with ultrapure water. Measure 60 mL of graphene oxide, centrifuge for 30 minutes in a centrifuge, pour off the upper layer of water, pour the lower graphene oxide into a graduated cylinder, add 30 mL of organic solvent N,N-dimethylformamide, and then measure 5 mL of dopamine and cysteine ​​5mL, mixed evenly with graphene oxide and organic solvent, put it into a hydrothermal reaction kettle, and reduced it with nitrogen in a vacuum drying oven at 100°C for 12h. After the reduction, the graphene was taken out of the reaction kettle and cooled And after washing, the N / S co-doped reduced graphene oxide suspension, manganese chloride tetrahydrate and...

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Abstract

The invention discloses a Manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst for an oxygen reduction reaction, a preparation method of the manganese dioxide loaded nitrogen-sulfurdouble-doped graphene catalyst and the application of the manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst. The general formula of the catalyst is Mn-C-N / S, wherein heteroatomsN and S are doped to increase the graphene defects and disorder degree, and various valence manganese compounds are loaded to increase the electrocatalytic activity of the catalyst. When the mass ratio of N / S co-doped reduced graphene oxide to manganese chloride tetrahydrate to potassium permanganate is 1: 7.5: 5, a clear oxygen reduction reaction peak of the catalyst is observed in -0.52 V, at the moment, the peak current density of the catalyst is 5.72 mA cm <-2>, and the catalyst has the best oxygen reduction activity. The graphene oxide is prepared by adopting a Hummers modification method, and the manganese dioxide loaded nitrogen-sulfur double-doped graphene catalyst is prepared by adopting a two-step hydrothermal method. According to the present invention, the reaction conditions are mild, the process flow is simple and convenient, the reaction process is easy to control, and a highly feasible way is provided for reducing the cost of the fuel cell and realizing the commercialization.

Description

technical field [0001] The invention relates to the technical field of fuel cell catalysis, in particular to a manganese dioxide-supported nitrogen-sulfur double-doped graphene catalyst for oxygen reduction reaction (ORR), a preparation method and application. Background technique [0002] A fuel cell is one of the representatives of new energy technologies, a device that converts chemical energy into electrical energy through chemical reactions. It is not limited by the Carnot cycle, and can directly convert chemical energy into electrical energy through the reaction of catalytic fuel and oxygen. The energy efficiency is as high as 70%, and the product is mostly water, which has very little damage to the environment. [0003] Fuel cells have shown excellent battery performance and environmental protection in applications, but there are many problems in terms of lifespan and stability, and high cost has always been one of the bottlenecks in the commercialization of fuel cell...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/06H01M12/08
CPCH01M4/9016H01M4/9083H01M12/06H01M12/08
Inventor 税子怡赵炜陈曦陈黎
Owner NORTHWEST UNIV
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