La-Ca-Mn/carbon nanotube dual-functional composite catalyst and preparation and application thereof

A technology of composite catalysts and carbon nanotubes, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the cumbersome preparation process, rare reports in the field of zinc-air batteries, and sufficient electrochemical performance. Discharge performance cycle life needs to be improved, etc., to achieve the effect of simple process, excellent electrochemical performance, charge and discharge performance, and excellent electrochemical performance

Inactive Publication Date: 2016-05-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

La 0.4 Ca 0.6 MnO 4 Research on graphene or carbon nanotubes has also been involved, but there are few reports on the application of zinc-air batteries [J.Mater.Chem.2013,1,4754–4762]
In addition, the above catalysts have defects such as cumbersome preparation process, and they still need to be improved in terms of electrochemical performance, charge and discharge performance, and cycle life.

Method used

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  • La-Ca-Mn/carbon nanotube dual-functional composite catalyst and preparation and application thereof
  • La-Ca-Mn/carbon nanotube dual-functional composite catalyst and preparation and application thereof
  • La-Ca-Mn/carbon nanotube dual-functional composite catalyst and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0041] A bifunctional catalyst comprising carbon nanotubes, lanthanum oxide, calcium oxide and manganese dioxide. The manganese dioxide is tubular, with a length of 1-3 μm and an inner diameter of 7-10 nm; the calcium oxide is nanoparticles with a diameter of 10-30 nm; The diameter of the carbon nanotube is 10nm and the length is 3-10μm, and the carbon nanotube, calcium oxide and manganese dioxide are composited together.

[0042] The preparation method of bifunctional catalyst of the present invention is:

[0043] (1) configuration potassium permanganate and the mass ratio of water are the homogeneous mixed aqueous solution of 1.2:50, under room temperature the ratio of potassium permanganate solution and concentrated hydrochloric acid (concentration is 37.5%, the same below) is 51.2g:2ml Slowly add concentrated hydrochloric acid into the stirred potassium permanganate solution, stir until the mixture is uniform, pour the uniform solution into an autoclave at 140°C for 10 ho...

Embodiment 2

[0050] A bifunctional catalyst comprising carbon nanotubes, lanthanum oxide, calcium oxide and manganese dioxide. The manganese dioxide is tubular, with a length of 1-3 μm and an inner diameter of 7-10 nm; calcium oxide is nanoparticles with a diameter of 10-30 nm; the length of lanthanum oxide is 0.2-0.5 μm, and the length of carbon nanotubes with a diameter of 10 nm is 3-10μm, carbon nanotubes, calcium oxide and manganese dioxide are composited together.

[0051] Preparation of three-way catalysts at different calcination temperatures:

[0052] (1) configuration potassium permanganate and the mass ratio of water are the homogeneous mixed aqueous solution of 1.2:50, under room temperature the ratio of potassium permanganate solution and concentrated hydrochloric acid (concentration is 37.5%, the same below) is 51.2g:2ml Slowly add concentrated hydrochloric acid into the stirred potassium permanganate solution, stir until the mixture is uniform, pour the uniform solution into...

Embodiment 3

[0058] A bifunctional catalyst comprising carbon nanotubes, lanthanum oxide, calcium oxide and manganese dioxide. The manganese dioxide is tubular with a length of 1-3 μm and an inner diameter of 7-10 nm; calcium oxide is a nanoparticle with a diameter of 10-30 nm; lanthanum oxide is a nanorod with a length of 0.2-0.5 μm and a diameter of The length of 10nm carbon nanotubes is 3-10μm, and carbon nanotubes, cobalt oxide and manganese dioxide are composited together.

[0059] Preparation methods of different mass ratios of bifunctional catalyst raw materials:

[0060] (1) The mass ratio of configuration potassium permanganate and water is a homogeneous mixed aqueous solution of 1.2:100. At room temperature, the ratio of potassium permanganate solution and concentrated hydrochloric acid is 51.2g: 2ml of concentrated hydrochloric acid is slowly added to the stirred permanganate Potassium solution, stirred until evenly mixed, poured the homogeneous solution into an autoclave for 1...

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Abstract

The invention relates to a La-Ca-Mn/carbon nanotube dual-functional composite catalyst and preparation and application thereof. The catalyst comprises a composite of carbon nanotubes, nanometer lanthanum oxide, nanometer calcium oxide and nanometer manganese dioxide and is prepared according to the following steps of weighing lanthanum nitrate, calcium nitrate, a manganese dioxide precursor and the carbon nanotubes according to a mass ratio of 0.2:(0.16-0.4):0.1:(0-0.05) and dissolving the materials in ammonia water, carrying out ultrasonic dispersion, carrying out a hydrothermal reaction for 5 hours at 160 DEG C, cooling the obtained product to a room temperature, and carrying out washing, drying, calcinating and grinding. The invention also relates to the application of the dual-functional composite catalyst in preparation of an air electrode of a metal-air battery. The La-Ca-Mn/carbon nanotube dual-functional composite catalyst has the advantages of greenness, environmental friendliness, availability in raw material, low cost, moderate reaction condition, short reaction time, simplicity and practicability in process, high controllability and the like, is easy to produce in a large scale, and is a favorable air electrode catalyst which can be applied to the fields of metal-air batteries such as zinc-air, aluminum-air and magnesium-air batteries.

Description

technical field [0001] The invention belongs to the field of composite catalysts and their preparation and application, in particular to a bifunctional composite catalyst of lanthanum calcium manganese / carbon nanotubes and its preparation and application. Background technique [0002] With the continuous development of contemporary society, the demand for energy continues to increase, and the consumption of fossil energy has increased sharply. As a result, people's awareness of environmental friendliness has also matured, and human society has also begun to transition from fossil energy to clean energy. Research on the development of clean and sustainable energy conversion devices [NanoLett.2012,12,1946-1952]. Rechargeable metal-air batteries have the advantages of high safety performance, simple preparation, and environmental friendliness, especially zinc-air batteries, whose theoretical energy density is much higher than that of traditional lithium-ion batteries, not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06B82Y30/00
CPCH01M4/9091B82Y30/00H01M12/06
Inventor 乔锦丽徐能能
Owner DONGHUA UNIV
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