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Nitrogen-doped cross-linked hierarchically porous molybdenum carbide coated with ultra-thin carbon layer and its preparation

A molybdenum carbide, hierarchical pore technology, applied in chemical instruments and methods, chemical/physical process, physical/chemical process catalyst, etc., can solve the problem of high carbon material content, difficult hydrogen precipitation, and excessive Mo-H bond To achieve the effect of strengthening the mass transfer and diffusion process, improving the overall electrical conductivity and excellent catalytic performance

Active Publication Date: 2021-02-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Molybdenum carbide has significant catalytic activity due to its unique Pt-like d-band electronic structure, but there are problems such as easy agglomeration during the preparation process, poor electrical conductivity, and excessive Mo-H bonding energy, which leads to difficult precipitation of hydrogen gas.
In this regard, on the one hand, the overall electrical conductivity of the material is improved by constructing a molybdenum carbide / carbon material composite structure, but the content of carbon material in the composite structure is too high, which is difficult to effectively control, and the performance of molybdenum carbide will be lost; on the other hand, The process of mass transfer and diffusion is strengthened by constructing molybdenum carbide mesoporous structure, but the choice of hard template still requires subsequent tedious pickling process

Method used

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  • Nitrogen-doped cross-linked hierarchically porous molybdenum carbide coated with ultra-thin carbon layer and its preparation
  • Nitrogen-doped cross-linked hierarchically porous molybdenum carbide coated with ultra-thin carbon layer and its preparation
  • Nitrogen-doped cross-linked hierarchically porous molybdenum carbide coated with ultra-thin carbon layer and its preparation

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Embodiment 1

[0063] This embodiment provides a method for preparing a nitrogen-doped crosslinked hierarchical porous molybdenum carbide material coated with an ultra-thin carbon layer, wherein the method includes the following steps:

[0064] Weigh 0.5g of ammonium molybdate and 1g of g-C 3 N 4 Template (ammonium molybdate and g-C 3 N 4 The mass ratio of the template is 1:2), using a household soybean milk machine to mix and stir, and after mixing evenly, the resulting mixture is placed in a closed reaction tube, and then placed in an atmosphere tube furnace, and the temperature is raised to 5°C / min. Keep at 450°C for 1 hour, then raise the temperature to 800°C at the same heating rate, and hold for 0.5 hours. After the reaction is over, the nitrogen-doped cross-linked hierarchical porous molybdenum carbide material coated with the ultra-thin carbon layer is prepared;

[0065] In this embodiment, the closed reaction tube is a high temperature resistant stainless steel closed reaction tu...

Embodiment 2

[0073] This embodiment provides a method for preparing a nitrogen-doped crosslinked hierarchical porous molybdenum carbide material coated with an ultra-thin carbon layer, wherein the method includes the following steps:

[0074] Weigh 0.5g of ammonium molybdate and 2g of g-C 3 N 4 Template (ammonium molybdate and g-C 3 N 4 The mass ratio of the template is 1:4), using a household soybean milk machine to mix and stir, and after mixing evenly, the resulting mixture is placed in a closed reaction tube, and then placed in an atmosphere tube furnace, and the temperature is raised to 5°C / min. Keep at 450°C for 1 hour, then raise the temperature to 800°C at the same heating rate, and hold for 0.5 hours. After the reaction is over, the nitrogen-doped cross-linked hierarchical porous molybdenum carbide material coated with the ultra-thin carbon layer is prepared;

[0075] In this embodiment, the closed reaction tube is a high temperature resistant stainless steel closed reaction tu...

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Abstract

The invention provides a nitrogen-doped cross-linked hierarchical pore molybdenum carbide material coated with an ultrathin carbon layer and a preparation method thereof, the material comprises a skeleton structure formed by mutual cross-linking of molybdenum carbide particles, and the surface of each molybdenum carbide particle is coated with an ultra-thin carbon layer. The skeleton structure hasa mesoporous-macroporous structure, and the mesoporous-macroporous structure is derived from gaps formed by mutual cross-linking of molybdenum carbide particles. Nitrogen atoms are doped in the molybdenum carbide particles and the ultrathin carbon layer. When the material provided by the invention is used as an electrocatalyst for hydrogen production by hydrolysis, the material has good conductivity and catalytic performance, and meanwhile, the mass transfer diffusion process in the catalytic process can be enhanced.

Description

technical field [0001] The invention relates to a nitrogen-doped cross-linked multi-level porous molybdenum carbide material coated with an ultra-thin carbon layer and its preparation, belonging to the technical field of clean energy utilization. Background technique [0002] The development of clean and green energy is the focus of attention all over the world, especially the research on the utilization of hydrogen resources. Hydrogen production by electrolysis of water has the characteristics of environmental protection and low cost, and has become a research hotspot. Although platinum-based materials exhibit excellent hydrogen evolution performance, their scarcity, high price, and easy deactivation restrict their large-scale applications. Therefore, the development of high-performance and inexpensive non-noble metal electrocatalysts has become an urgent problem to be solved. [0003] Molybdenum carbide has significant catalytic activity due to its unique Pt-like d-band ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J27/22B01J35/02B01J35/10C25B1/04C25B11/091
CPCB01J27/22B01J27/24B01J35/0033B01J35/0073B01J35/0086B01J35/023B01J35/1014C25B11/091Y02E60/36
Inventor 杨旺李永峰闫璐候利强
Owner CHINA UNIV OF PETROLEUM (BEIJING)