High-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and preparation method and application thereof

A carbon nanotube composite and carbon nanotube technology, which is applied in the field of electrocatalysis, can solve the problems of low activity and conductivity, and achieve the effects of simple preparation method, obvious synergistic effect and good stability

Active Publication Date: 2016-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defect that single manganese dioxide has low activity and electrical conductivity as an ORR catalyst in the prior art, one of the purposes of the present invention is to provide a kind o...

Method used

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  • High-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and preparation method and application thereof
  • High-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and preparation method and application thereof
  • High-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and preparation method and application thereof

Examples

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Embodiment 1

[0027] MnO 2 -Mn 3 O 4 / The preparation of carbon nanotubes is divided into two steps, as follows:

[0028] (1) Preparation of oxidized carbon nanotubes

[0029] Oxidized carbon nanotubes were synthesized using a modified Hummers method. Weigh 1 g of multi-walled carbon nanotubes into a 250 mL round-bottomed flask, slowly add 23 mL of concentrated sulfuric acid, and stir for 24 h. Transfer the round bottom flask to a 35 °C water bath and add 0.2 g NaNO 3 and keep stirring. To be NaNO 3 After dissolving, add 1g KMnO very slowly 4 , to be KMnO 4 After the addition, the stirring was continued for 120 min. Slowly add 46 mL of deionized water, transfer to a 98°C water bath and heat for 30 min, remove and cool to room temperature and stir continuously, add 140 mL of deionized water and 10 mL of 30% hydrogen peroxide in sequence and stir for 5 min. The oxidized carbon nanotubes in the suspension were collected by centrifugation. During the centrifugation process, they were...

Embodiment 2

[0036] According to the method of Example 1, in MnO 2 -Mn 3 O 4 25 mg of oxidized carbon nanotubes were added to the preparation of carbon nanotubes.

[0037] The evaluation method of catalytic performance is the same as that of Example 1.

[0038] The obtained MnO 2 -Mn 3 O 4 The onset potential of the composite / carbon nanotube composite as ORR catalyst is -0.09V (vs.Hg / HgO), the half-wave potential is -0.22V (vs.Hg / HgO), and the limiting current density is -5.6mA / cm 2 . In the galvanometric evaluation, the current density retention rate was about 90% after continuous operation for 7200 s.

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Abstract

The invention discloses a high-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and a preparation and an application thereof. The composite catalyst is prepared by embedding MnO2 nanorods and Mn3O4 nanoparticles into meshes of a carbon nanotube network and/or depositing the MnO2 nanorods and the Mn3O4 nanoparticles on the surface of a carbon nanotube. The preparation method comprises the steps of: dissolving or dispersing potassium permanganate, ammonium chloride and oxidized carbon nanotube into water for hydrothermal reaction; and carrying out cooling, suction filtration, washing and drying on the hydrothermal reaction product to obtain the high-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst. The preparation method is simple and beneficial to industrial production; and the prepared MnO2-Mn3O4/carbon nanotube composite catalyst is applied to a fuel cell, has the characteristics of high activity and good stability, has approximate overall performance in comparison with a 20wt%Pt/C commercial catalyst and has a good application prospect.

Description

technical field [0001] The invention relates to an oxygen reduction (ORR) catalyst and its preparation and application method, in particular to a high-performance oxygen reduction MnO for fuel cells 2 -Mn 3 o 4 The invention discloses a carbon nanotube composite catalyst and a preparation method thereof, belonging to the technical field of electrocatalysis. Background technique [0002] Due to the excessive use of traditional fossil energy, human beings are facing more and more serious energy shortages and environmental pollution crises, and it is imminent to develop green and safe new energy sources. As an environment-friendly and efficient energy conversion device, fuel cells have attracted more and more researchers' attention. Pt and its alloys are currently commercialized ORR catalysts for fuel cells. Although they have high activity, the high price and unsatisfactory stability limit the wide commercial application of fuel cells. Therefore, the key to the wide applic...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9016H01M4/9083Y02E60/50
Inventor 钱东刘昆王喜鹏闵紫嫣李军
Owner CENT SOUTH UNIV
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