Preparation method of nitrogen-doped carbon nanofiber aerogel with inlaid molybdenum carbide particles

A technology of nitrogen-doped carbon and nanofibers, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems hindering practical applications, and achieve excellent catalytic performance for electrogenerating hydrogen, The effect of high specific surface area and easy scale production

Active Publication Date: 2016-03-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the reported methods for preparing molybdenum carbide / carbon nanocomposite catalysts inevitably involve some complicated and even dangerous synthetic steps as well as expensive precursors, hindering their practical application.

Method used

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  • Preparation method of nitrogen-doped carbon nanofiber aerogel with inlaid molybdenum carbide particles
  • Preparation method of nitrogen-doped carbon nanofiber aerogel with inlaid molybdenum carbide particles
  • Preparation method of nitrogen-doped carbon nanofiber aerogel with inlaid molybdenum carbide particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take a commercially purchased 320×240×12mm 3 Large pieces of bacterial cellulose were soaked in deionized water for 5 days to remove acid, and the deionized water was replaced every day. Cut the large piece of bacterial cellulose after deacidification into 50×20×12mm 3The small pieces were obtained from pretreated bacterial cellulose for use. The pretreated bacterial cellulose was soaked in 2.5mM ammonium heptamolybdate aqueous solution for 3 days, then frozen with liquid nitrogen for 25 minutes, and then transferred to a freeze dryer for 4 days to obtain ammonium heptamolybdate hybrid bacterial cellulose gas. gel.

[0041] The ammonium heptamolybdate hybrid bacterial cellulose airgel obtained by freeze-drying was placed in a ceramic boat, and then transferred to a tube furnace for pyrolysis in a nitrogen atmosphere. °C / min reaches 500 °C after 4 hours, keeps at 500 °C for 1 hour, then increases to 800 °C at 5 °C / min, and keeps at 800 °C for 2 hours to fully carboniz...

Embodiment 2

[0052] Take a commercially purchased 320×240×12mm 3 Large pieces of bacterial cellulose were soaked in deionized water for 5 days to remove acid, and the deionized water was replaced every day. Cut the large piece of bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces were obtained from pretreated bacterial cellulose for use. The pretreated bacterial cellulose was soaked in 7.5mM ammonium heptamolybdate aqueous solution for 3 days, then frozen with liquid nitrogen for 25 minutes, and then transferred to a freeze dryer to dry for 4 days to obtain white ammonium heptamolybdate hybrid bacterial fiber Plain airgel.

[0053] The ammonium heptamolybdate-hybrid bacterial cellulose airgel obtained by freeze-drying was placed in a ceramic boat and then transferred to a tube furnace. Pyrolysis under nitrogen atmosphere, first start from room temperature 20°C, reach 500°C at 2°C / min for 4 hours, keep at 500°C for 1 hour, then increase to 900°C at 5°C / min, and ...

Embodiment 3

[0056] Take a commercially purchased 320×240×12mm 3 Large pieces of bacterial cellulose were soaked in deionized water for 5 days to remove acid, and the deionized water was replaced every day. Cut the large piece of bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces of the obtained pretreated bacterial cellulose are ready for use. Soak the pretreated bacterial cellulose in 5mmol / L ammonium heptamolybdate aqueous solution for 5 days, then freeze it with liquid nitrogen for 30min, and then transfer it to a freeze dryer to dry for 3 days to obtain white ammonium heptamolybdate hybrid bacteria Cellulose airgel.

[0057] The ammonium heptamolybdate-hybrid bacterial cellulose airgel obtained by freeze-drying was placed in a ceramic boat and then transferred to a tube furnace. Pyrolysis under nitrogen atmosphere, first start from room temperature at 20°C, reach 500°C at 1°C / min for 8 hours, keep at 500°C for 2 hours, then increase to 1000°C at 5°C / min, a...

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Abstract

The invention discloses a preparation method of nitrogen-doped carbon nanofiber aerogel with inlaid molybdenum carbide particles. The preparation method comprises the following steps of immersing bacterial cellulose in deionized water for removing acid, then immersing the bacterial cellulose in an ammonium heptamolybdate aqueous solution, conducting absorption till saturation, and obtaining ammonium heptamolybdate / bacterial cellulose; freezing the ammonium heptamolybdate / bacterial cellulose with liquid nitrogen, then conducting drying in a freeze dryer, and obtaining bacterial cellulose aerogel hybridized with ammonium heptamolybdate; finally, placing the hydridized bacterial cellulose aerogel in a tube furnace, conducting high temperature pyrolysis, and obtaining the nitrogen-doped carbon nanofiber aerogel with the inlaid molybdenum carbide particles. According to the method, the ammonium heptamolybdate and the bacterial cellulose are combined for being applied to preparation of functional carbon nano-materials, the method has the advantages of being simple, low in price, green, environmentally friendly, easy to produce on a large-scale and the like, and the prepared nitrogen-doped carbon nanofiber aerogel with the inlaid molybdenum carbide particles can serve as a catalyst for electric hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of nitrogen-doped carbon nanofiber airgel embedded with molybdenum carbide particles. Background technique [0002] Hydrogen is a clean and sustainable energy, which is very promising to replace traditional fossil energy in the future energy system. Hydrogen can be obtained by electrolysis of water in an electrolysis cell. At present, the most effective catalysts for hydrogen production from water electrolysis are platinum-based catalysts, but their high price and limited reserves limit their large-scale application. Therefore, there are increasing researches on non-platinum catalysts for hydrogen production. Recently, the application of traditional metal chalcogenides, phosphides, carbides, nitrides, and borides as non-noble metal catalysts in the field of electric hydrogen production has achieved remarkable results. [0003] Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/22B01J35/06B82Y30/00C25B1/02C25B11/03C25B11/06
CPCB01J21/18B01J27/22B01J27/24B01J35/0006B01J35/06B82Y30/00C25B1/02C25B11/04C25B11/031
Inventor 俞书宏吴振禹胡必成
Owner UNIV OF SCI & TECH OF CHINA
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