Nickel manganese/carbon nanotube composite catalyst and preparation and application thereof

A carbon nanotube composite and carbon nanotube technology, which is applied to functional catalysts and their preparation and application fields, can solve the problems of limiting metal-air battery efficiency, unfavorable industrial-scale preparation, complex catalyst preparation process, etc., and achieves excellent charge-discharge performance. and stability, excellent electrochemical performance, low cost effect

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

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Problems solved by technology

However, since the slow kinetic progression of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) limits the efficiency of metal-air batteries, it is urgent to develop bifunctional catalysts with high activity and stability.
Dai et al. prepared cobalt oxide / carbon nanotubes and nickel-iron-layered double hydroxide electrocatalysts for rechargeable zinc-air battery cathodes, but still remained in pure oxygen conditions, and the battery model was complicated [Nature Communications , 2013, 249, 1805-1806]
Electrocatalytic activity and stability of certain cobalt-like spinel oxides, such as Co 3 o 4 [J.Mater.Chem.A2014,2,3794-3800] and CoMn 2 o 4 [A.Chem.Soc.2014,6,16545-16555], nickel cobaltate and nickel oxides and NiCo 2 o 4 / Graphene and other studies have been reported, but it is mainly used in oxygen reduction (ORR) [J.Power.Sou.2014,272,808-815], and the direct application of catalysts to metal zinc-air batteries should be rare [J.Mater .Chem.2013,1,4754–4762]
In addition, the preparation process of the above-mentioned catalysts is complicated, which is not conducive to industrial scale preparation

Method used

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  • Nickel manganese/carbon nanotube composite catalyst and preparation and application thereof
  • Nickel manganese/carbon nanotube composite catalyst and preparation and application thereof
  • Nickel manganese/carbon nanotube composite catalyst and preparation and application thereof

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Embodiment 1

[0032] Bifunctional catalysts, including carbon nanotubes and nickel manganese oxide (NiMnO 4 ) spinel. The nickel manganese oxide (NiMnO 4 ) spinel is a nano particle with a diameter of 20-150nm, and is uniformly loaded on the carbon nanotube.

[0033] The preparation method of catalyst is:

[0034] The first step: configure the potassium permanganate solution that the mass ratio of potassium permanganate and water is 1.4g:100, add the concentrated hydrochloric acid that potassium permanganate solution and concentrated hydrochloric acid ratio are 101.4g:4ml to the high In the potassium manganate solution, continue to stir until the mixture is uniform, transfer the resulting mixture to an autoclave at 145°C for a hydrothermal reaction for 10 hours, cool to room temperature, wash with ethanol and deionized water for 5 times, and then dry at 80°C In 24 hours, the manganese dioxide precursor was obtained;

[0035]Step 2: Weigh 0.125g of the above-mentioned manganese dioxide p...

Embodiment 2

[0040] Bifunctional catalysts, including carbon nanotubes and nickel manganese oxide (NiMnO 4 ) spinel. The nickel manganese oxide (NiMnO 4 ) spinel spinel is a nano particle with a diameter of 20-150nm, and is uniformly loaded on carbon nanotubes.

[0041] Preparation of catalytic composites at different calcination temperatures:

[0042] The first step: configure the potassium permanganate solution that the mass ratio of potassium permanganate and water is 1.4g:100, add the concentrated hydrochloric acid that potassium permanganate solution and concentrated hydrochloric acid ratio are 101.4g:4ml to the high In the potassium manganate solution, continue to stir until the mixture is uniform, transfer the resulting mixture to an autoclave at 145°C for a hydrothermal reaction for 10 hours, cool to room temperature, wash with ethanol and deionized water for 5 times, and then dry at 80°C In 24 hours, the manganese dioxide precursor was obtained;

[0043] Step 2: Weigh 0.125g o...

Embodiment 3

[0048] The catalyst powder of the embodiment 1 of 5mg is dissolved in the 5% Nafion solution of 1ml ethanol and 8 μ l, forms homogeneous catalyst slurry by ultrasonic 40 minutes, then sprays on the carbon paper through hydrophobic treatment, and the control catalyst load is 2mg / cm 2 The air electrode was prepared by drying at 60°C for 40 minutes. At the same time, the zinc foil with the same area as the carbon paper was used as the negative electrode. Batteries, tested using the Gradient Current Mode using the fuel cell activation system:

[0049] At normal temperature and pressure, test the power generation curve and polarization curve such as image 3 As shown, it can be seen that the open circuit voltage of a single cell can reach 1395mV, and the maximum power generation density can reach 172mW / cm 2 . When the voltage is 1V, the current density is 135.9mAcm -2 , the corresponding power generation density reaches 135.9mW / cm 2 .

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Abstract

The invention relates to a nickel manganese / carbon nanotube composite catalyst and preparation and application thereof. The bifunctional catalyst comprises a carbon nanotube and nickel manganese (NiMnO4) spinel. A manganese dioxide precursor, nickelous acetate and the carbon nanotube are dissolved in ammonia water and undergo ultrasonic dispersion, undergo a hydrothermal reaction for 3-6 h at 130-150 DEG C, are cooled to room temperature, cleaned, dried and calcinated, and the nickel manganese / carbon nanotube composite catalyst is obtained. The nickel manganese / carbon nanotube composite catalyst is applied to an air electrode of a metal-air battery. The nickel manganese / carbon nanotube composite catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance and can be applied to metal-air batteries.

Description

technical field [0001] The invention belongs to the field of functional catalysts and their preparation and application, in particular to a nickel manganate / carbon nanotube composite catalyst and its preparation and application. Background technique [0002] In recent years, with the consumption of fossil energy and the intensification of environmental pollution, countries around the world are competing to develop and research clean and sustainable energy conversion devices, among which energy storage and conversion devices using electrochemical reactions have attracted great attention [Chem.Soc . Rev., 2014, 43, 5257--5259]. In particular, rechargeable metal zinc-air batteries have become a research hotspot due to their low cost, light weight, safety, environmental friendliness, excellent safety performance, and high theoretical specific energy and power density. Whether in terms of economic benefits and environmental protection, zinc-air batteries have been recognized as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889H01M4/90
CPCY02E60/50
Inventor 乔锦丽徐能能李浩然张恩光汤俏薇李雪梅
Owner DONGHUA UNIV
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