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Preparation method for single-walled carbon nanotube (SWCNT) hollow ball oxygen reduction catalyst, and application of SWCNT hollow ball oxygen reduction catalyst

A technology of single-walled carbon nanotubes and carbon nanotubes, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as covering of catalytic active sites, easy agglomeration and long catalyst life, resource scarcity, etc., and achieve efficient oxygen reduction Electrochemical performance and stability, conducive to diffusion and rapid transport, and the effect of accelerating the kinetic process

Active Publication Date: 2017-04-26
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, platinum-based catalysts still have two problems: one is expensive and resources are scarce; the other is that they are easily poisoned by organic fuels and the catalyst is easy to agglomerate and grow, which reduces the life of the catalyst.
However, because these nano-carbon materials (such as carbon nanotubes, graphene, etc.) are usually stacked and aggregated with each other, many catalytic active sites are covered, making it difficult for the catalyst to fully exert its proper catalytic performance in practical battery applications. performance

Method used

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  • Preparation method for single-walled carbon nanotube (SWCNT) hollow ball oxygen reduction catalyst, and application of SWCNT hollow ball oxygen reduction catalyst
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  • Preparation method for single-walled carbon nanotube (SWCNT) hollow ball oxygen reduction catalyst, and application of SWCNT hollow ball oxygen reduction catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Preparation of monodisperse oxidized single-walled carbon nanotubes:

[0040] Add the initial single-walled carbon nanotube solid and potassium permanganate solid to the excess concentrated sulfuric acid solution at a ratio of 1: (1-4), and place the resulting reaction mixture in a water bath at 40-70°C Continue to stir and react for 1-6h. After diluting the reacted mixed solution with deionized water, add excess hydrogen peroxide solution and stir for more than 10min. Wash the water by high-speed centrifugation until the supernatant is neutral (PH=6-7), then remove the lower layer of solids and add deionized water to fully stir, and after further centrifugation, take a uniform and stable solution in the upper layer to obtain monodisperse oxidation Aqueous solutions of single-walled carbon nanotubes.

[0041] 2) Preparation of hollow spherical single-walled carbon nanotube assemblies:

[0042] First, the silica microsphere template was dispersed in water by ultraso...

Embodiment 2

[0061] The Co-coordinated porphyrin-like ring compound vitamin B12 (VB12) and the hollow spherical single-walled carbon nanotube assembly were mixed uniformly by grinding with the assistance of ethanol at a mass ratio of 1:4 and 1:0.5, respectively. Annealed under a nitrogen atmosphere at 1000°C for 6 hours to obtain two cobalt / nitrogen co-doped single-wall carbon nanotube hollow sphere oxygen reduction catalysts, that is, single-wall carbon nanotube hollow sphere oxygen reduction catalysts

[0062] Figure 12 In this example, the cyclic voltammetry curve of the cobalt / nitrogen co-doped single-wall carbon nanotube hollow sphere oxygen reduction catalyst prepared by mixing VB12 and single-wall carbon nanotube spheres in a ratio of 1:4, at saturated N 2 Under the 0.1M KOH electrolyte solution, the cyclic voltammogram in the voltage range of -0.03 ~ 1.15V is similar to a rectangle, and there is no obvious reduction peak. while in saturated O 2 In the 0.1M KOH electrolyte soluti...

Embodiment 3

[0068] The Fe-coordinated porphyrin-like ring compound oxymethemin and the hollow spherical single-walled carbon nanotube assembly were uniformly mixed in a mass ratio of 1:0.5 with the assistance of ethanol, and the mixture was placed in a 1000°C Annealing for 1 h under an ammonia atmosphere yields an iron / nitrogen co-doped single-wall carbon nanotube hollow sphere oxygen reduction catalyst, that is, a single-wall carbon nanotube hollow sphere oxygen reduction catalyst.

[0069] Figure 16 It is the cyclic voltammetry curve of the iron / nitrogen co-doped single-walled carbon nanotube hollow sphere oxygen reduction catalyst obtained in this example, at saturated N 2 Under the 0.1M KOH electrolyte solution, the cyclic voltammogram in the voltage range of -0.03 ~ 1.15V is similar to a rectangle, and there is no obvious reduction peak. Relatively speaking, at saturation O 2 Under the 0.1M KOH electrolyte solution, there is an obvious characteristic peak of the oxygen reduction r...

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Abstract

The invention belongs to the field of energy, and particularly relates to a preparation method for a single-walled carbon nanotube (SWCNT) hollow ball oxygen reduction catalyst, and an application of the SWCNT hollow ball oxygen reduction catalyst. The SWCNT hollow ball oxygen reduction catalyst is an SWCNT hollow ball oxygen reduction catalyst with co-doping of a transition metal and nitrogen, and the preparation method comprises the following steps: monodispersed oxidized SWCNTs are firstly self-assembled into SWCNT balls in the shape of hollow balls through the hard template method; the SWCNT hollow balls and a transition metal N4 cyclic compound are then sufficiently mixed; and calcination is then carried out in an ammonia or inert atmosphere to achieve the co-doping of the transition metal and the nitrogen, so that the SWCNT hollow ball oxygen reduction catalyst is obtained. The catalyst achieves efficient oxygen reduction catalysis performance, and can be used as an air electrode catalyst for hydrogen-oxygen fuel cells, zinc-air fuel cells, magnesium-air fuel cells, and aluminum-air fuel cells.

Description

technical field [0001] The invention belongs to the field of energy, in particular to a preparation method and application of a single-walled carbon nanotube hollow sphere oxygen reduction catalyst. Background technique [0002] Energy shortage and environmental pollution are two major problems facing society today. As a power generation device that directly converts chemical energy into electrical energy, fuel cells have the advantages of high energy density, high conversion efficiency, clean and pollution-free, and are considered to be a sustainable green and clean energy source. Therefore, the development of fuel cells has become one of the important ways to solve energy and environmental problems. In fuel cells, including hydrogen-oxygen fuel cells and metal-air fuel cells, the cathode oxygen reduction catalyst is a key factor affecting the performance of the cell. At present, the cathode catalysts used in fuel cells are mainly Pt-based catalysts, because platinum-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9083Y02E60/50
Inventor 吴初新官轮辉余强敏许交兴张建硕赵毅
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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