Preparation of graphene/silicon carbide three-dimensional composite aerogel and loaded molybdenum disulfide electrocatalyst thereof

A composite aerogel and three-dimensional composite technology, which is applied in the preparation and application fields of electrocatalytic hydrogen production, to achieve the effects of improving electrical conductivity and stability, enhancing electrocatalytic hydrogen production performance, and reducing activation barriers

Active Publication Date: 2021-06-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no report on the direct application of molybdenum disulfide supported on graphene / silicon carbide three-dimensional composite airgel for electrocatalytic hydrogen production

Method used

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  • Preparation of graphene/silicon carbide three-dimensional composite aerogel and loaded molybdenum disulfide electrocatalyst thereof
  • Preparation of graphene/silicon carbide three-dimensional composite aerogel and loaded molybdenum disulfide electrocatalyst thereof

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Embodiment 1

[0030] A kind of preparation of graphene / silicon carbide three-dimensional composite airgel and the method for carrying molybdenum disulfide electrocatalyst thereof, comprise the following steps, mix 0.5g graphene and 0.86g silica sol in the solvent of water and ethanol, pump Filter into blocks and dry at 120°C; mix 20g of carbon felt and 3.7g of silica sol in a solvent of water and ethanol, and dry at 120°C; spread the carbon felt on the bottom of a graphite crucible, and then filter it with suction to obtain Place the graphene block on the top of the carbon felt and cover the crucible lid; under the protection of 0.5MPa argon, heat it to 1300°C at a heating rate of 5°C / min, and keep it at 1300°C for 2h to obtain graphene / carbonized Silicon three-dimensional composite airgel. Add 0.6g of sodium molybdate and 0.75g of thioacetamide into 30mL of deionized water, stir for 30 minutes, then add 0.01g of graphene / silicon carbide three-dimensional composite airgel, soak for 12h; tra...

Embodiment 2

[0035] A kind of preparation of graphene / silicon carbide three-dimensional composite airgel and the method for carrying molybdenum disulfide electrocatalyst thereof, comprise the following steps, 0.9g graphene and 1.2g silica sol are mixed uniformly in the solvent of water and ethanol, pumping Filter into blocks and dry at 120°C; mix 22g of carbon felt and 4.5g of silica sol in a solvent of water and ethanol, and dry at 120°C; spread the carbon felt on the bottom of a graphite crucible, and then filter with suction to obtain Place the graphene block on the top of the carbon felt and cover the crucible lid; under the protection of 0.8MPa argon, heat it to 1450°C at a heating rate of 8°C / min, and keep it at 1450°C for 2h to obtain graphene / carbonized Silicon three-dimensional composite airgel. Add 0.6g of sodium molybdate and 0.75g of thioacetamide into 30mL of deionized water, stir for 30 minutes, then add 0.01g of graphene / silicon carbide three-dimensional composite airgel, so...

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Abstract

The invention discloses preparation of graphene / silicon carbide three-dimensional composite aerogel and a loaded molybdenum disulfide electrocatalyst of the graphene / silicon carbide three-dimensional composite aerogel, and belongs to the field of inorganic nano materials. The graphene / silicon carbide three-dimensional composite aerogel is prepared from the following components in percentage by mass: 23.6 to 88.9% of graphene and 11.1 to 76.4% of silicon carbide. The used graphene is a graphene nanosheet, and the silicon carbide is a silicon carbide nanowire. Silicon carbide nanowires with a three-dimensional connection structure grow in a graphene network. The density is 5.6 mg / cm < 3 > to 32.6 mg / cm < 3 >. The preparation method of the graphene / silicon carbide three-dimensional composite aerogel is an in-situ CVD (chemical vapor deposition) method, and carbon monoxide and silicon monoxide generated by silica gel cracking are nucleated and grow on graphene to form the silicon carbide nanowire. Through carbon-silicon bond combination, a good interface can be formed between graphene and silicon carbide, the conductivity and stability of the material are improved, and the method is simple in process and beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to the preparation of a graphene / silicon carbide composite airgel and its application in electrocatalytic hydrogen production. Background technique [0002] Graphene has very important application prospects in nanomaterials, bioengineering, and fine chemicals. Graphene can provide a unique two-dimensional support for other nanomaterials, because the unique physical, chemical and mechanical properties of graphene can prepare composite materials with excellent properties. Usually, two-dimensional graphene materials exist in powder form, and their excellent specific surface area and thermal and electrical conductivity properties will be limited. Therefore, the development of composite materials based on three-dimensional graphene skeletons has important academic value and broad application prospects. As a semiconductor material, silicon carbide nanowires have great applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/095C25B1/04
CPCC25B1/04Y02E60/36
Inventor 王红洁万鹏飞彭康牛敏苏磊庄磊徐亮
Owner XI AN JIAOTONG UNIV
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