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Preparation and application for Ni-Co oxide catalyst prepared on basis of water-in-oil reverse microemulsion method

A reverse-phase microemulsion and water-in-oil technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low production efficiency, uneven particle size, and affecting catalytic performance of nano-scale materials, and achieve good ORR catalytic activity And reaction stability, simple preparation method, easy to popularize the effect

Active Publication Date: 2017-07-07
青岛伊森新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the prepared NiCo 2 o 4 The material method is the co-precipitation method, but in most cases the co-precipitation method will cause excess waste of the precipitant, and the yield is low, the particle size is uneven or agglomerated, which will affect the catalytic performance
[0005] Therefore, in the prior art, for sea urchin NiCo 2 o 4 The problem of low production efficiency of nano-scale materials, there is still a lack of effective technical solutions

Method used

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  • Preparation and application for Ni-Co oxide catalyst prepared on basis of water-in-oil reverse microemulsion method
  • Preparation and application for Ni-Co oxide catalyst prepared on basis of water-in-oil reverse microemulsion method
  • Preparation and application for Ni-Co oxide catalyst prepared on basis of water-in-oil reverse microemulsion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Prepare A solution, weigh 0.5mmol Ni(NO 3 ) 2 , 1mmol Co(NO 3 ) 2 , then add 3ml cyclohexane, 4.66mL DDAB (concentration: 2mmol / L), 2.34mL n-butanol, add water dropwise and stir for 0.5h until the solution is clear and transparent. To prepare solution B, add 3ml cyclohexane, 4.66mL DDAB (concentration: 2mmol / L), 2.34mL n-butanol, add ammonia water to adjust the pH to 9-10, and stir for 0.5h. Then mix the two solutions well, add ammonia water to adjust the pH to 9-10. From transparent to opaque. After stirring for half an hour, pour it into a reaction kettle and heat it at 60°C for 24 hours, then take it out, centrifuge and wash it, and vacuum freeze-dry it for 24 hours. Next, put it into a tube furnace for roasting, raise the temperature to 300°C in the air and keep it for 3h, and the heating rate is 5°C / min. Finally, the sea urchin-like nanostructured NiCo 2 o 4 , the quality is about 0.253g, and the productive rate is 89.3%, and the NiCo of productive rate (%)...

Embodiment 2

[0069] Prepare A solution, weigh 0.5mmol Ni(NO 3 ) 2 , 1mmol Co(NO 3 ) 2 , then added 4ml cyclohexane, 4mL DDAB (concentration: 4mmol / L), 2mL n-butanol, added water dropwise and stirred for 0.5h until the solution was clear and transparent. To prepare solution B, add 4ml cyclohexane, 4mL DDAB (concentration: 4mmol / L), 2mL n-butanol, add ammonia water to adjust the pH to 9-10, and stir for 0.5h. Then mix the two solutions well, add ammonia water to adjust the pH to 9-10. From transparent to opaque. After stirring for half an hour, pour it into a reaction kettle, heat it at 80°C for 24 hours, take it out, centrifuge and wash it, and vacuum freeze-dry it for 12 hours. Then put it into a tube furnace for roasting, raise the temperature to 400°C in the air and keep it for 3h, the heating rate is 10°C / min. Finally, the sea urchin-like nanostructured NiCo 2 o 4 , the mass is about 0.232g, and the yield is 85%. Product appearance is identical with embodiment 1. The catalyst ...

Embodiment 3

[0071] Prepare A solution, weigh 1mmol Ni(NO 3 ) 2 , 2mmol Co(NO 3 ) 2 , add 3ml of n-hexane, 4.66mL of DDAB (concentration: 6mmol / L), 2.34mL of n-butanol, add water dropwise and stir for 0.5h until the solution is clear and transparent. To prepare solution B, add 3ml cyclohexane, 4.66mL DDAB (concentration: 6mmol / L), 2.34mL n-butanol, add ammonia water to adjust the pH to 9-10, and stir for 0.5h. Then mix the two solutions well, add ammonia water to adjust the pH to 9-10. From transparent to opaque. After stirring for half an hour, pour it into a reaction kettle and heat it at 60°C for 24 hours, then take it out, centrifuge and wash it, and vacuum freeze-dry it for 24 hours. Then put it into a tube furnace for roasting, raise the temperature to 500°C in the air and keep it for 2h, the heating rate is 10°C / min. Finally, the sea urchin-like nanostructured NiCo 2 o 4 , the mass is about 0.504g, and the yield is 85.6%. Product appearance is identical with embodiment 1. ...

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Abstract

The invention discloses a preparation and application for a Ni-Co oxide catalyst prepared on the basis of a water-in-oil reverse microemulsion method. The preparation comprises the following steps: preparing a NiCo2O4 precursor, namely preparing a solution A which includes an oil phase, didodecyldimethylammonium bromide (DDAB), a cosurfactant, a nickel salt and a cobalt salt, adding water into the solution A and stirring till being transparent, and then preparing a solution B which includes the oil phase, the didodecyldimethylammonium bromide (DDAB) and the cosurfactant, adding ammonium hydroxide for regulating pH of the solution B to a preset pH and then stirring the solution B till being transparent, uniformly mixing and stirring the solution A and the solution B, adding ammonium hydroxide for keeping pH unchanged and forming a reverse microemulsion, and then heating, cooling, separating and drying, thereby acquiring the NiCo2O4 precursor; and preparing a NiCo2O4 material, namely roasting the NiCo2O4 precursor, thereby acquiring a sea urchin-shaped NiCo2O4 material.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and specifically relates to the preparation and application of a nickel-cobalt oxide catalyst based on a water-in-oil inverse microemulsion method. Background technique [0002] Fuel cells are widely used in production and life due to their low by-products. However, the slow kinetics of the cathodic oxygen reduction reaction limits the efficient application of fuel cells. The oxygen reduction reaction can carry out energy exchange through two processes: (1) two-electron transfer, the intermediate product is hydrogen peroxide; (2) four-electron transfer, no intermediate product, and the final product is water. The second way has higher energy conversion and more efficient reaction, which is what people want to achieve. Platinum catalysts have excellent performance, but their high price limits their wide application in catalysis. Therefore, the development of highly active non-preci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9016Y02E60/50
Inventor 王宗花于婧张立学
Owner 青岛伊森新材料股份有限公司
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