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Metal phase layered molybdenum disulfide/reduced graphene oxide composite catalyst carrier and preparation method thereof

A graphene composite, catalyst carrier technology, applied in the field of nanomaterials, can solve the problems of poor anti-oxidation performance, poor conductivity of molybdenum disulfide catalyst carrier, low long-term stability, etc., and achieves improved mass transfer efficiency, low cost, and improved utilization. rate effect

Pending Publication Date: 2022-05-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, especially for the shortcomings of the current precious metal catalyst carrier, such as poor oxidation resistance, low long-term stability, and poor conductivity of the molybdenum disulfide catalyst carrier, to provide a catalyst with a large specific surface area and catalytic activity. Metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier with high conductivity and long-term stability and preparation method thereof

Method used

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  • Metal phase layered molybdenum disulfide/reduced graphene oxide composite catalyst carrier and preparation method thereof
  • Metal phase layered molybdenum disulfide/reduced graphene oxide composite catalyst carrier and preparation method thereof
  • Metal phase layered molybdenum disulfide/reduced graphene oxide composite catalyst carrier and preparation method thereof

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Embodiment 1

[0037] A preparation method of metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier of the present invention comprises the following steps:

[0038] (1) Weigh 60 mg of graphene oxide flakes and disperse them in 30 mL of deionized water. After ultrasonic dispersion for 1 hour, add 300 μL of concentrated sulfuric acid (98 wt%) and 250 mg of citric acid in sequence, and continue ultrasonic dispersion for 1 hour to obtain a graphene oxide dispersion. The content of sulfur element in the graphene dispersion is 1.8mmol / mL.

[0039] (2) The graphene oxide dispersion was transferred to a 50 mL polytetrafluoroethylene reactor, and subjected to a hydrothermal reaction at a temperature of 180° C. for 12 hours to obtain a sulfur-doped reduced graphene oxide hydrogel.

[0040] (3) Wash the above-mentioned sulfur-doped reduced graphene oxide hydrogel with water, then use liquid nitrogen to freeze the sulfur-doped reduced graphene oxide hydrogel and dry ...

Embodiment 2

[0049] A preparation method of metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier of the present invention comprises the following steps:

[0050] (1) Weigh 40 mg of graphene oxide flakes and disperse them in 30 mL of deionized water. After ultrasonic dispersion for 1 hour, add 150 μL of dimethyl sulfoxide and 250 mg of ascorbic acid in sequence, and continue ultrasonic dispersion for 1 hour to obtain a graphene oxide dispersion liquid, graphene oxide The elemental sulfur content in the dispersion was 0.07mmol / mL.

[0051] (2) The graphene oxide dispersion was transferred to a 50 mL polytetrafluoroethylene reactor, and reacted at a temperature of 180° C. for 24 hours to obtain a sulfur-doped reduced graphene oxide hydrogel.

[0052] (3) Wash the above-mentioned sulfur-doped reduced graphene oxide hydrogel with water, then carry out vacuum drying treatment, the temperature of vacuum drying treatment is 80 ° C, and then place it in a tube ...

Embodiment 3

[0055] A preparation method of metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier of the present invention comprises the following steps:

[0056] (1) Weigh 80 mg of graphene oxide flakes and disperse them in 30 mL of deionized water. After ultrasonic dispersion for 1 hour, add 100 mg of sulfur powder and 200 mg of sodium citrate in turn, and continue ultrasonic dispersion for 1 hour to obtain a graphene oxide dispersion. The sulfur element content in the liquid is 0.05mmol / mL.

[0057] (2) The graphene oxide dispersion was transferred to a 50 mL polytetrafluoroethylene reactor, and reacted at a temperature of 200° C. for 18 hours to obtain a sulfur-doped reduced graphene oxide hydrogel.

[0058] (3) Wash the above-mentioned sulfur-doped reduced graphene oxide hydrogel with water, then use a rotary evaporator to dry it, and then place it in a tube furnace, and treat it at 700°C for 2h under the protection of argon gas at a flow rate of 1...

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Abstract

The invention discloses a metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier and a preparation method thereof.The preparation method comprises the steps that graphene oxide dispersion liquid, sulfur-doped reduced graphene oxide hydrogel and sulfur-doped reduced graphene oxide aerogel are prepared in sequence; and mixing the aerogel with a sulfur source and a molybdenum source at 150-180 DEG C for reaction to obtain the metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier. According to the preparation method, the anchoring effect of reduced graphene oxide on molybdenum disulfide is improved through sulfur doping, the molybdenum disulfide exists in a metal phase instead of a conventional 2H phase, high conductivity of the catalyst carrier is guaranteed, the oxidation resistance of the catalyst carrier is enhanced through introduction of the metal phase molybdenum disulfide and the sulfur element, and the preparation method is suitable for industrial production. The composite catalyst carrier also has the advantages of large specific surface area, high catalytic activity and the like, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a metal phase layered molybdenum disulfide / reduced graphene oxide composite catalyst carrier and a preparation method thereof. Background technique [0002] Carbon black is a common carrier for platinum-carbon catalysts used in cathodes of energy devices such as fuel cells and metal-air batteries. Although the current commercial carbon black has the advantages of large specific surface area, low cost, and high electrical conductivity, its low platinum loading and poor durability have become the key factors restricting the commercialization of fuel cells and metal-air batteries. In addition, during the long-term use of the battery, the platinum particles are prone to excessive growth due to the Oswald ripening process, which reduces the catalytic performance; at the same time, in the highly oxidative operating environment inside the battery, the corrosion o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J21/18B01J32/00
CPCB01J27/051B01J21/18B01J35/23B01J35/33Y02E60/50
Inventor 周新贵孙炼杨雅萍余金山王洪磊
Owner NAT UNIV OF DEFENSE TECH
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