Preparation of a graphene/silicon carbide three-dimensional composite aerogel and its supported molybdenum disulfide electrocatalyst

A three-dimensional composite, molybdenum disulfide technology, applied in electrodes, electrolysis components, electrolysis process, etc., to achieve the effect of reducing activation barrier, enhancing electrocatalytic hydrogen production performance, and simple process

Active Publication Date: 2022-07-12
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 a graphene/silicon carbide three-dimensional composite aerogel and its supported molybdenum disulfide electrocatalyst
  • Preparation of a graphene/silicon carbide three-dimensional composite aerogel and its supported molybdenum disulfide electrocatalyst

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Embodiment 1

[0030] A method for preparing a graphene / silicon carbide three-dimensional composite aerogel and a method for supporting a molybdenum disulfide electrocatalyst, comprising the following steps: mixing 0.5 g of graphene and 0.86 g of silica sol in a solvent of water and ethanol, pumping Filter into a block and dry at 120 °C; mix 20 g of carbon felt with 3.7 g 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 suction filtration to obtain The graphene block was placed on top of the carbon felt, and the crucible lid was covered; under the protection of 0.5MPa argon, it was heated to 1300°C at a heating rate of 5°C / min, and kept at 1300°C for 2 h to obtain graphene / carbonized Silicon three-dimensional composite aerogel. Take 0.6g sodium molybdate and 0.75g thioacetamide into 30mL deionized water, stir for 30 minutes, then add 0.01g graphene / silicon carbide three-dimensional composite aerogel, soa...

Embodiment 2

[0035] A method for preparing a graphene / silicon carbide three-dimensional composite aerogel and a method for supporting a molybdenum disulfide electrocatalyst, comprising the following steps: mixing 0.9 g of graphene and 1.2 g of silica sol in a solvent of water and ethanol, pumping Filter into a block and dry at 120 °C; mix 22 g of carbon felt with 4.5 g 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 suction filtration to obtain The graphene block was placed on top of the carbon felt, and the crucible lid was covered; under the protection of 0.8MPa argon, it was heated to 1450°C at a heating rate of 8°C / min, and kept at 1450°C for 2 h to obtain graphene / carbonized Silicon three-dimensional composite aerogel. Add 0.6g sodium molybdate and 0.75g thioacetamide into 30mL deionized water, stir for 30 minutes, then add 0.01g graphene / silicon carbide three-dimensional composite aerogel, soak ...

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Abstract

The invention discloses the preparation of a graphene / silicon carbide three-dimensional composite aerogel and a molybdenum disulfide electrocatalyst loaded therewith, belonging to the field of inorganic nanomaterials. The graphene / silicon carbide three-dimensional composite aerogel is composed of 23.6%-88.9% graphene and 11.1%-76.4% silicon carbide in terms of mass percentage; the graphene used is graphene nanosheets, and the silicon carbide is silicon carbide Nanowires. Silicon carbide nanowires with a three-dimensionally connected structure are grown in a graphene network. Density is 5.6mg / cm 3 ~32.6mg / cm 3 . The preparation method of the graphene / silicon carbide three-dimensional composite aerogel adopted in the present invention is the in-situ CVD method. Wire. Through carbon-silicon bonding, a good interface can be formed between graphene and silicon carbide, which is beneficial to improve the conductivity and stability of the material. The method has a simple process and is conducive to large-scale production.

Description

technical field [0001] The invention belongs to the field of inorganic nanomaterials, in particular to the preparation of a graphene / silicon carbide composite aerogel 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 are limited. Therefore, the development of composite materials with three-dimensional graphene framework as the theme has important academic value and broad application prospects. As a semiconductor material, silicon carbide nanowires have great application prospe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
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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