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Bimetallic nitride Co3W3N, preparation method and application thereof

A nitride and bimetal technology, applied in the field of bimetallic nitride Co3W3N and its preparation, can solve problems such as poor catalytic activity, and achieve the effects of poor cycle stability, high nitrogen reduction catalytic activity and large yield

Active Publication Date: 2018-12-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The transition metal nitrides currently used are mainly single metal nitrides. However, compared with the catalytic activity of noble metal systems, the catalytic activity of single metal nitrides is poor.

Method used

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  • Bimetallic nitride Co3W3N, preparation method and application thereof
  • Bimetallic nitride Co3W3N, preparation method and application thereof
  • Bimetallic nitride Co3W3N, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Prepare tungsten hexachloride and cobalt chloride in equimolar proportions respectively to make tungsten hexachloride aqueous solution and cobalt chloride aqueous solution, and then slowly add the cobalt chloride aqueous solution to the tungsten hexachloride aqueous solution, and fully stir for 2 hours , making a mixed solution; wherein, the concentration of tungsten hexachloride in the tungsten hexachloride aqueous solution is 1mol / L, and the concentration of cobalt chloride in the cobalt chloride aqueous solution is 1mol / L;

[0028] (2) Transfer the above mixed solution to the reaction kettle, after hydrothermal reaction at 120°C for 24 hours, wash and filter with water, evaporate to dryness at room temperature, and obtain the double transition metal oxide CoWO 4 , followed by the CoWO 4 Preheat treatment at 150°C and air atmosphere for 2 hours;

[0029] (3) CoWO after the above preheating treatment 4 , placed in an ammonia atmosphere tube furnace, heated up to ...

Embodiment 2

[0032] (1) Prepare tungsten hexachloride and cobalt sulfate in equimolar proportions respectively to make tungsten hexachloride aqueous solution and cobalt sulfate aqueous solution, and then slowly add cobalt sulfate aqueous solution into tungsten hexachloride aqueous solution, and fully stir for 2 hours to obtain Mixed solution; wherein, the concentration of tungsten hexachloride in the tungsten hexachloride aqueous solution is 0.5mol / L, and the concentration of cobalt sulfate in the cobalt sulfate aqueous solution is 0.5mol / L;

[0033] (2) Transfer the above mixed solution to a reaction kettle, and after hydrothermal reaction at 160°C for 12 hours, wash and filter with water, and evaporate to dryness at room temperature to obtain the double transition metal oxide CoWO 4 , followed by the CoWO 4 Preheat treatment at 160°C and air atmosphere for 2 hours;

[0034] (3) CoWO after the above preheating treatment 4 , placed in an ammonia atmosphere tube furnace, heated up to 650°...

Embodiment 3

[0036](1) Sodium tungstate and cobalt acetylacetonate in equimolar proportions were prepared respectively into sodium tungstate aqueous solution and cobalt acetylacetonate aqueous solution, and then the cobalt acetylacetonate aqueous solution was slowly added dropwise to the sodium tungstate aqueous solution, and fully stirred for 2 hours to obtain Mixed solution; wherein, the concentration of sodium tungstate in the sodium tungstate solution is 1.5mol / L, and the concentration of cobalt acetylacetonate in the cobalt acetylacetonate aqueous solution is 1.5mol / L;

[0037] (2) Transfer the above mixed solution to the reaction kettle, and after hydrothermal reaction at 140°C for 16 hours, wash and filter with water, evaporate to dryness at room temperature, and obtain the double transition metal oxide CoWO 4 , followed by the CoWO 4 Preheat treatment at 180°C for 2 hours in air atmosphere;

[0038] (3) CoWO after the above preheating treatment 4 , placed in an ammonia atmosphere...

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Abstract

The invention discloses a bimetallic nitride Co3W3N, a preparation method and application thereof. The Co3W3N is prepared by subjecting a cobalt salt and a tungsten salt of equal molar ratio to hydrothermal reaction and then performing nitriding synthesis. The Co3W3N is applied to the electrochemical catalysis field. The bimetallic nitride Co3W3N provided by the invention is a intermetallic mold filling compound, has the properties of covalent compounds, ionic crystals and transition metals, has high oxygen reduction catalytic activity and nitrogen reduction catalytic activity, the catalytic activity is close to that of commercial Pt / C, also the phase is pure, the stability is strong and the methanol resistance is excellent. At the same time, the preparation method is simple, effective andcontrollable, is easy to operate, low in cost and high in yield, and the problems of poor cycle stability and easy agglomeration of particles caused by thermal decomposition of the bimetallic nitrideto form a mixture of metal elements and metal nitrides can be effectively avoided.

Description

technical field [0001] The invention belongs to the field of double metal nitrides, in particular to a double metal nitride Co 3 W 3 N and its preparation method and application. Background technique [0002] As the global population continues to grow and the energy, environment and food crises become increasingly serious, it is particularly important to use energy efficiently and find new renewable energy sources. Fuel vehicles are one of the main ways of air pollution at present, and the energy consumed by industrial synthetic ammonia accounts for 4-5% of the total global energy consumption, so it is necessary to seek new technologies to alleviate the above problems. Currently promising technologies include fuel cell-oxygen reduction (ORR) and electrocatalytic ammonia synthesis (NRR). However, the above-mentioned catalytic reactions are mainly based on platinum-based noble metal catalysts, and the high price of platinum-based noble metal catalysts limits the further dev...

Claims

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Application Information

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IPC IPC(8): C01B21/00H01M4/90
CPCC01B21/0615C01P2002/72H01M4/9041Y02E60/50
Inventor 何建平郭虎姜澄王涛宋力范晓莉龚浩夏伟黄现礼
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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