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Nickel cobalt oxide/carbon nanotube composite catalyst, preparation and application thereof

A carbon nanotube composite and carbon nanotube technology, which is applied in the field of nickel cobaltate/carbon nanotube composite catalyst and its preparation and application, can solve the problems of low power generation of zinc-air batteries, unreported zinc-air batteries, and limitations and other issues, to achieve the effect of excellent charge and discharge performance and stability, excellent electrochemical performance, and low cost

Inactive Publication Date: 2016-02-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature reports, direct growth of cobalt trioxide nanowires on stainless steel mesh collectors has excellent rechargeability and stability, but in practice zinc-air batteries use natural air to generate electricity is not high [AdvancedEnergyMaterials, 2014, 6, 1301389–1301395]
The electrochemical properties of nickel and nickel oxides have been widely studied, but mainly limited to the oxygen evolution reaction (OER) [Nature Communications, 2013, 249, 1805-1812,]
NiCo 2 o 4 / Graphene has also been studied for ORR and OER, but it has not been reported directly in the actual zinc-air battery [J.Mater.Chem.2013,1,4754–4762]

Method used

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  • Nickel cobalt oxide/carbon nanotube composite catalyst, preparation and application thereof
  • Nickel cobalt oxide/carbon nanotube composite catalyst, preparation and application thereof
  • Nickel cobalt oxide/carbon nanotube composite catalyst, preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Catalysts: including carbon nanotubes, nickel cobaltate (NiCo 2 o 4 ) spinel; of which nickel cobaltate (NiCo 2 o 4 ) spinel is a nanosphere with a diameter of 20-150nm; nickel cobaltate (NiCo 2 o 4 ) spinel composited with carbon nanotubes.

[0041] Preparation:

[0042] Weigh 1g of nickel acetate, 1g of cobalt nitrate and 0.25g of carbon nanotubes respectively, dissolve them in 25mL of 1-1.5mol / L ammonia water, disperse them ultrasonically for 1 hour, then transfer them to an autoclave at 140°C for 5 hours, and cool to At room temperature, wash 5 times with deionized water until neutral, then transfer to a 70°C drying oven for 10 hours. After drying, it is calcined in a muffle furnace at 400°C for 1 to 5 hours, and then the temperature is lowered to below 60°C and ground into powder to obtain a bifunctional catalyst. Such as figure 1 Shown, nickel cobaltate (NiCo 2 o 4 ) spinel is a nanosphere with a diameter of 20-150nm; nickel cobaltate (NiCo 2 o 4 ) sp...

Embodiment 2

[0047] Bifunctional catalysts: including carbon nanotubes, nickel cobaltate (NiCo 2 o 4 ) spinel, of which nickel cobaltate (NiCo 2 o 4 ) spinel is a nanosphere with a diameter of 20-150nm; nickel cobaltate (NiCo 2 o 4 ) spinel composited with carbon nanotubes.

[0048] The preparation method is:

[0049] Weigh 1g of nickel acetate, 1g of cobalt nitrate and 0.25g of carbon nanotubes respectively, dissolve them in 25mL of 1-1.5mol / L ammonia water, disperse them ultrasonically for 1 hour, then transfer them to an autoclave at 150°C for 5 hours, and cool to At room temperature, wash with deionized water for 3-5 times until neutral and turn to 70°C drying oven for 10 hours; When the temperature is below 60°C, it can be ground into powder to obtain a dual-function catalyst.

[0050] Dissolve 5 mg of catalyst powder in 1 ml of ethanol and 8 μl of 5% nafion solution, sonicate for 30 minutes to form a homogeneous catalyst slurry, and then drop-coat it on the disk electrode with...

Embodiment 3

[0054] The catalyst powder of the embodiment 1 of 5mg is dissolved in the 5% Nafion solution of 1ml ethanol and 8 μ l, ultrasonic 30 minutes forms homogeneous catalyst slurry, is then coated on the carbon paper through hydrophobic treatment (loading is 2mg / cm 2 ), and dried at 50°C for 30 minutes to prepare an air electrode. At the same time, a zinc foil with the same area as the carbon paper was used as the negative electrode. A zinc-air battery, tested using a fuel cell activation system using gradient current mode:

[0055] Test the power generation curve and polarization curve at normal temperature and pressure, such as Figure 4 As shown, it can be seen that the open circuit voltage of a single cell reaches 1395mV, and the maximum power generation density reaches 321mW / cm 2 . When the voltage is 1V, the current reaches 213.9 / cm 2 , power generation density reaches 215.1mW / cm 2 .

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Abstract

The invention relates to a nickel cobalt oxide / carbon nanotube composite catalyst, a preparation and an application thereof. The bi-functional catalyst comprises carbon nanotube and nickel cobalt oxide NiCo2O4 spinel; according to the preparation, nickel acetate, cobalt nitrate and carbon nanotube are respectively weighed, and then dissolved in ammoniacal liquor and the obtained material is performed with ultrasonic dispersion, then is subjected to a hydrothermal reaction at temperature of 140-160 DEG C for 3-6 hours, the obtained product is cooled to room temperature, cleaned and dried, calcined and ground to obtain the bi-functional catalyst. The invention also provides an application of the bifunctional catalyst in preparation of an air electrode of a metal air battery. The bi-functional catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance in air.

Description

technical field [0001] The invention belongs to the field of catalysts and their preparation and application, in particular to a nickel cobaltate / carbon nanotube composite catalyst and its preparation and application. Background technique [0002] In recent years, with the consumption of fossil energy, the increasing demand for energy, and the growing awareness of environmental friendliness, countries all over the world are competing to develop and research clean and sustainable energy conversion devices. Great attention [NanoLett.2012, 12, 1946-1952]. Secondary metal-air batteries have the advantages of simple preparation, excellent safety performance, and environmental friendliness. In terms of economic benefits and environmental protection, zinc-air batteries have been recognized as one of the most effective and reliable new energy technologies in the 21st century [Nanoscale2013, 5, 4657-4661]. In particular, the theoretical energy density of zinc-air batteries is much ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755H01M4/90
CPCY02E60/50
Inventor 乔锦丽徐能能菅赛赛马承愚陈淑丽唐胜
Owner DONGHUA UNIV
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