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An ultra-small vanadium carbide embedded carbon nanotube material, a preparing method thereof and an application thereof in a water cracking hydrogen production aspect

A carbon nanotube and ultra-small carbon technology, which is used in the synthesis and application of catalysts, can solve the problems of large VC particle size, single morphology, complex preparation scheme, etc., and achieves short reaction period, low synthesis temperature, and overcoming complicated steps. Effect

Active Publication Date: 2018-11-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To overcome the disadvantages of complex preparation schemes, large VC particle size, single shape, and few applications in the field of electrocatalysis existing in the prior art

Method used

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  • An ultra-small vanadium carbide embedded carbon nanotube material, a preparing method thereof and an application thereof in a water cracking hydrogen production aspect
  • An ultra-small vanadium carbide embedded carbon nanotube material, a preparing method thereof and an application thereof in a water cracking hydrogen production aspect
  • An ultra-small vanadium carbide embedded carbon nanotube material, a preparing method thereof and an application thereof in a water cracking hydrogen production aspect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Weigh 1.5g of dicyandiamide, 0.3g of ammonium metavanadate, 0.2g of cobalt nitrate hexahydrate, fully mix and grind for 40min;

[0030] Step 2: Put the raw materials obtained in Step 1 into a porcelain boat, and react in a tube furnace with a vacuum atmosphere. The heating rate is 5°C / min. First, the temperature is raised to 500°C, and kept for 2 hours. 2h, cooled to room temperature to obtain a black powder;

[0031] Step 3: Dissolve the obtained black powder in 0.5M H 2 SO 4 Soak in the middle for 10h, this is to remove the metal element in the sample, after vacuum drying for 6h, grind to get VC / CNTs hydrogen production electrocatalyst.

[0032] figure 1 It is the XRD spectrum of the VC / CNTs electrocatalyst prepared in this example. It can be seen from the spectrum that the VC / CNTs sample contains graphitized carbon, VC and cobalt (cobalt embedded in the carbon tube). The characteristics of the three The peak is obvious, indicating that the crystallinity i...

Embodiment 2

[0034] Step 1: Weigh 2g of dicyandiamide, 0.2g of ammonium metavanadate, 0.3g of cobalt nitrate hexahydrate, fully mix and grind for 30min;

[0035] Step 2: Put the raw materials obtained in Step 1 into a porcelain boat, and react in a tube furnace with a vacuum atmosphere. The heating rate is 10°C / min. First, heat up to 500°C, keep it for 2 hours, continue to heat up to 700°C, and keep it warm. 2h, cooled to room temperature to obtain a black powder;

[0036] Step 3: Dissolve the obtained black powder in 0.5M H 2 SO 4 Soak in the middle for 10h, this is to remove the metal element in the sample, after vacuum drying for 6h, grind to get VC / CNTs hydrogen production electrocatalyst.

[0037] figure 2 , 3 It is the SEM and TEM spectrum of the VC / CNTs electrocatalyst prepared in this example. From the SEM picture, it can be seen that the carbon nanotubes have complete morphology and uniform dispersion. From the TEM picture, it can be seen that the presence of cobalt (black pa...

Embodiment 3

[0039] Step 1: Weigh 1g of dicyandiamide, 0.2g of ammonium metavanadate, and 0.1g of nickel nitrate hexahydrate, fully mix and grind for 50 minutes;

[0040] Step 2: Put the raw materials obtained in Step 1 into a porcelain boat and react in a tube furnace with nitrogen as the atmosphere. The heating rate is 7°C / min. First, the temperature is raised to 500°C and kept for 2 hours. 2h, cooled to room temperature to obtain a black powder;

[0041] Step 3: Dissolve the obtained black powder in 0.5M H 2 SO 4 Soak in the middle for 20h, this is to remove the metal element in the sample, vacuum dry for 6h and grind to get VC / CNTs hydrogen production electrocatalyst.

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Abstract

The invention discloses an ultra-small vanadium carbide embedded carbon nanotube material. A structure includes a carbon nanotube with a tube wall thickness which not exceeds 3 nm and vanadium nitrideultra-small crystal grains dispersing in the tube wall of the carbon nanotube, and the ultra-small vanadium carbide embedded carbon nanotube material has a nanometer-size tubular morphology. The preparing method for the ultra-small vanadium carbide embedded carbon nanotube material includes the following steps: dicyandiamide, ammonium metavanadate and a metal catalyst are mixed and then fully grinded; heat treatment is performed on a mixture at 500-1200 DEG C under atmosphere protection; after completing the heat treatment, a product is placed into an acidic environment and then impurity is removed; and a target product is obtained after cleaning, drying and griding. The invention also provides the application of the material in a water cracking hydrogen production aspect. A VC / CNTs hydrogen production electrocatalyst which is low in synthesizing temperature, is short in reaction period, uniform in material chemical composition, uniform in morphology size, high electrocatalytic activity and stability in an all pH electrolyte environment can be obtain through a single-step calcination method.

Description

technical field [0001] The invention relates to the technical field of synthesis and application of catalysts, in particular to an ultra-small vanadium carbide embedded carbon nanotube material, a preparation method and its application as a hydrogen production catalyst for electrocatalytic cracking of water. Background technique [0002] Hydrogen energy is considered as a promising energy carrier due to its high energy density. From the perspective of sustainable development, low-cost and high-efficiency hydrogen energy requires scientific and technological support, which is also a challenge. Hydrogen production by water splitting is an economical means of hydrogen production, and the process does not emit carbon dioxide. This process requires catalysts that lower the activation energy for hydrogen formation. It is well known that noble metals (Pt, Rh, Pd, etc.) are considered to be outstanding catalysts for hydrogen production due to their low overpotential and fast elect...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J37/08C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/22B01J37/082B01J37/084B01J35/33Y02E60/36
Inventor 曹丽云张宁冯亮亮黄剑锋贺菊菊杨丹刘倩倩赵亚娟
Owner SHAANXI UNIV OF SCI & TECH
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