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m 2 c/carbon nanosheet composite material and its preparation method and application

A technology of composite materials and carbon nanosheets, applied in the field of electrocatalytic materials, can solve the problems of small specific surface area, reduction of catalytic active area, increase of active catalytic area and limited effect of performance improvement, and achieve large specific surface area and electrochemical activity The effect of area, enhanced electrocatalytic hydrogen evolution ability, and high electrocatalytic hydrogen evolution ability

Active Publication Date: 2022-01-25
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing molybdenum carbide synthesis methods require high temperature, and this method will lead to particle aggregation, which has a small specific surface area, thereby reducing the catalytic active area and reducing catalytic performance.
In order to reduce particle aggregation, some people will use base materials and molybdenum carbide to form composite materials, but this method has limited effect on the increase of active catalytic area and performance improvement of catalysts

Method used

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  • m <sub>2</sub> c/carbon nanosheet composite material and its preparation method and application
  • m <sub>2</sub> c/carbon nanosheet composite material and its preparation method and application
  • m <sub>2</sub> c/carbon nanosheet composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) 0.5g molybdenum disulfide, base, 0.2g of dopamine hydrochloride was placed in 100mL of deionized water (pH of the mixture was 8.5) for the first contact at 25°C for 24 hours, and the product was washed and dried to obtain the molybdenum disulfide / polydopamine complex.

[0081] (2) Carbonizing the obtained molybdenum disulfide / polydopamine compound in a muffle furnace at a temperature of 600° C. in a nitrogen atmosphere for 2 hours to obtain a molybdenum disulfide / carbon compound;

[0082](3) Immerse the molybdenum disulfide / carbon composite in a 7mol / L potassium hydroxide solution for the second contact at 25°C. The mass ratio of the molybdenum disulfide / carbon composite to potassium hydroxide is 1:3, and then The first drying is carried out at 180°C, and the dried potassium hydroxide / molybdenum disulfide / carbon mixture is heat-treated in a muffle furnace at a temperature of 800°C in a nitrogen atmosphere for 1 hour, and the product is washed with deionized water a...

Embodiment 2

[0084] (1) 0.25g molybdenum disulfide, base, 0.2g of dopamine hydrochloride was placed in 100mL of deionized water (pH of the mixture was 8) for the first contact at 20°C for 18 hours, and the product was washed and dried to obtain the molybdenum disulfide / polydopamine complex;

[0085] (2) Carbonizing the obtained molybdenum disulfide / polydopamine compound in a muffle furnace at a temperature of 700° C. in a nitrogen atmosphere for 1 hour to obtain a molybdenum disulfide / carbon compound;

[0086] (3) Immerse the molybdenum disulfide / carbon composite in a 5mol / L potassium hydroxide solution at 20°C for the second contact, wherein the mass ratio of the molybdenum disulfide / carbon composite to potassium hydroxide is 1:2, and then Carry out the first drying at 150°C, heat-treat the dried potassium hydroxide / molybdenum disulfide / carbon mixture in a muffle furnace at a temperature of 750°C in a nitrogen atmosphere for 1.5 hours, wash the product with water and dilute hydrochloric ...

Embodiment 3

[0088] (1) 1g molybdenum disulfide, base, 0.36g of dopamine hydrochloride was placed in 100mL of deionized water (pH of the mixture was 9) and stirred at 30°C for 12 hours, and the product was washed and dried to obtain the molybdenum disulfide / polydopamine complex;

[0089] (2) Carbonizing the obtained molybdenum disulfide / polydopamine compound in a muffle furnace at a temperature of 650° C. in a nitrogen atmosphere for 3 hours to obtain a molybdenum disulfide / carbon compound;

[0090] (3) Immerse the molybdenum disulfide / carbon composite in a 10mol / L potassium hydroxide solution at 30°C for the second contact, wherein the mass ratio of the molybdenum disulfide / carbon composite to potassium hydroxide is 1:4, After that, the first drying is carried out at 150°C, and the dried potassium hydroxide / molybdenum disulfide / carbon mixture is heat-treated in a muffle furnace at a temperature of 900°C in a nitrogen atmosphere for 0.5 hours, and the product is washed with water and dilu...

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Abstract

The invention relates to the field of electrocatalytic materials, in particular to M 2 C / carbon nanosheet composite material and its preparation method and application. The composite material includes a porous carbon nanosheet substrate, and M grown on the porous carbon nanosheet substrate 2 C particles, wherein M is Mo element and / or W element. The obtained composite catalyst has a large specific surface area and an electrochemically active area, and can expose more active sites, so that the electrocatalytic hydrogen evolution ability of the catalyst is greatly enhanced.

Description

technical field [0001] The invention relates to the field of electrocatalytic materials, in particular to M 2 C / carbon nanosheet composite material and its preparation method and application. Background technique [0002] Environmental pollution and energy crisis have become the main problems to be solved for sustainable development. The key to solving the problem is to find a clean renewable energy source to replace non-renewable, greenhouse gas-producing fossil fuels. Hydrogen production by electrocatalytic water splitting is considered to be an effective solution. [0003] At present, the catalysts for electrocatalytic hydrogen evolution mainly use Pt-containing noble metal electrocatalysts. However, the scarcity and high price of precious metals limit their application. Therefore, it is of great significance to develop an inexpensive and abundant non-noble metal electrocatalyst. [0004] So far, transition metal-based composite electrocatalysts (such as transition m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22C25B11/075C25B1/04
CPCB01J27/22B01J35/0033C25B11/04C25B1/04Y02E60/36
Inventor 翟俊宜雷瑛
Owner BEIJING INST OF NANOENERGY & NANOSYST
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