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Method for preparing vanadium nitride

A technology of vanadium nitride and nitride, which is applied in the field of preparation of supercapacitor materials, can solve the problems of large particle size, unsatisfactory catalytic performance and electrochemical performance, and achieve high cost performance, outstanding charge and discharge performance, and equipment requirements not high effect

Inactive Publication Date: 2010-06-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because vanadium raw materials and vanadium nitride products are prone to crystallization and agglomeration at high temperatures, the particle size of the product is relatively large, and its catalytic performance and electrochemical performance are often unsatisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2 grams of vanadium pentoxide to a beaker containing 100 ml of distilled water, add 2 mol / L hydrochloric acid dropwise while stirring until completely dissolved, add 40 grams of melamine to disperse at high speed, dry at 60°C for 5 hours, and dissolve the obtained block The material is ball milled. Load the obtained powder with a porcelain ark, and calcine it in a tube furnace with a nitrogen protection and temperature programming control device. The heating rate is 5°C / min to 850°C, and the temperature is kept for 2 hours. After cooling to room temperature, the target is obtained. product. It can be stored stably in the air for a long time after being passivated at room temperature in 0.1% argon containing oxygen for 2 hours.

[0024] Most of the above-mentioned target products have a particle size of <15nm and good conductivity. They are used as active materials for supercapacitor electrodes to make working electrodes, and simulated supercapacitor units are assem...

Embodiment 2

[0026] Add 2 grams of ammonium polyvanadate to a beaker containing 100 ml of distilled water, stir until it is completely dissolved, add 10 grams of urea to disperse at high speed, dry at 80°C for 3 hours, and ball mill the obtained blocky material. The obtained powder is loaded into a porcelain ark and calcined in a tube furnace equipped with ammonia gas protection and temperature programming control device, the heating rate is 5°C / min to 800°C, the temperature is kept for 3 hours, and after cooling to room temperature, the obtained target product. It can be stored stably in the air for a long time after being passivated at room temperature in 0.1% argon containing oxygen for 2 hours.

[0027] Most of the above-mentioned target products have a particle size of <10nm and good conductivity. They are used as active materials for supercapacitor electrodes to make working electrodes, and simulated supercapacitor units are assembled for cyclic voltammetry and constant current charg...

Embodiment 3

[0029] Add 2 grams of vanadium sulfide to a beaker containing 100 ml of distilled water, add ammonia water dropwise while stirring, control its pH to 12 until it dissolves completely, add 30 grams of cyanamide to disperse at high speed, dry at 100°C for 2 hours, and dry the resulting block material Perform ball milling. Load the obtained powder with a porcelain ark, and calcine it in a tube furnace with a nitrogen protection and temperature programming control device. The heating rate is 5°C / min to 900°C, and the temperature is kept for 5 hours. After cooling to room temperature, the target is obtained. product. It can be stored stably in the air for a long time after being passivated at room temperature in 0.1% argon containing oxygen for 2 hours.

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Abstract

The invention discloses a method for preparing vanadium nitride. In the preparation method, a vanadium-containing compound is mixed with organic nitride, and the mixture is calcinated in nitrogen-containing gas to obtain the vanadium nitride. The vanadium nitride prepared by the method has small grain diameter, and has higher specific capacitance and good cycle performance. The method for preparing the vanadium nitride has the advantages of wide source of raw materials, low production cost, simple operation and low requirement on equipment, meets the requirement of modern industry on energy conservation and emission reduction, and is favorable for industrial production. When the method is used for preparing super capacitors, the super capacitors have high specific capacitance and good cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of supercapacitor materials, in particular to a preparation method of vanadium nitride. Background technique [0002] Vanadium nitride (VN) is an important industrial raw material. Due to its very high thermal and chemical stability and strong mechanical properties, it can be used in cutting tools and structural materials to increase the durable strength of steel, improve the toughness and At the same time, it also improves the thermal strength and short-term creep resistance of steel. In addition, vanadium nitride has high catalytic activity, high selectivity, good stability and anti-poisoning performance. Its catalytic behavior is similar to that of Pt, Pd and Rh. It is an economical substitute for these rare and precious metals and has been widely used in industrial desulfurization. catalyst. [0003] Recent studies have shown that VN has good electrical conductivity and good supercapacitive perfor...

Claims

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Application Information

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IPC IPC(8): C01B21/06
Inventor 舒东程福奎陈红雨彭亮波文萃
Owner SOUTH CHINA NORMAL UNIVERSITY
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