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Carbon nanotube, a supported catalyst comprising the same, and fuel cell using the same

A technology for supporting catalysts and carbon nanotubes, applied in the field of carbon nanotubes, can solve the problems that carbon nanotubes do not have surface resistance and cannot be used as

Inactive Publication Date: 2007-08-29
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, conventional carbon nanotubes do not have satisfactory surface resistance and cannot be used as catalyst supports for catalysts supporting fuel cells.

Method used

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  • Carbon nanotube, a supported catalyst comprising the same, and fuel cell using the same
  • Carbon nanotube, a supported catalyst comprising the same, and fuel cell using the same
  • Carbon nanotube, a supported catalyst comprising the same, and fuel cell using the same

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preparation Embodiment 1

[0048] Preparation Example 1: Preparation of Carbon Nanotubes

[0049] At 100 °C, 0.25 g of SWNT(CNI) and 0.09 g of NiCl as a nickel catalyst precursor 2 ·6H 2 O(or Ni(CH 3 COO) 2 ) was mixed with 100 g of water and 80 g of ethylene glycol for 24 hours. The liquid mixture is then dried. Subsequently, the dried mixture was subjected to thermal vapor deposition using acetylene gas at 650°C. As secondary growth, MWNTs were grown for 10 minutes to produce carbon nanotubes.

[0050] 2 and 3 are scanning electron micrographs of carbon nanotubes prepared according to Preparation Example 1 before and after secondary growth, respectively.

[0051] In Figures 2 and 3, MWNTs are mixed with SWNTs.

[0052] The carbon nanotubes prepared according to Preparation Example 1 were analyzed by Raman analysis, and the results are shown in FIG. 4 . The Raman analysis spectra of SWNTs and MWNTs are shown in Fig. 4 together.

[0053] Referring to Figure 4, SWNTs show a G peak (~1600cm -1 ...

Embodiment 1

[0057] Embodiment 1: the preparation of fuel cell

[0058] 0.5 g of the carbon nanotubes of Preparation Example 1 were put into a plastic tape. Independently, the 0.9616gH 2 PtCl 6 Dissolve in 1.5ml acetone. The solution was poured into a plastic strip containing the carbon nanotubes and mixed.

[0059] The mixture was air-dried for 4 hours and then placed in a crucible. The mixture in the crucible was dried overnight in a desiccator at 60°C. Next, the crucible was heat-treated at 60°C for 12 hours, at 200°C for 5 hours, and at 250°C for 2 hours, and then nitrogen was supplied to the crucible for 10 minutes. Then, while raising the temperature to 200° C., hydrogen was supplied to the crucible instead of nitrogen. The temperature was maintained at 200°C for 2 hours to reduce the platinum chloride on the carbon support. Subsequently, nitrogen was supplied into the crucible instead of hydrogen, and then the temperature was increased to 250°C at 5°C / min. The temperature ...

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Abstract

A carbon nanotube, a method of preparing the same, a supported catalyst including the same, and a fuel cell using the supported catalyst are provided. The method of preparing the carbon nanotube includes: depositing a metal catalyst in single wall nanotubes and growing multi wall nanotubes over the single wall nanotubes using the metal catalyst. The carbon nanotubes of the present invention have satisfactory specific surface area and low surface resistance. Thus, the carbon nanotubes perform remarkably better than a conventional catalyst carrier. Accordingly, the carbon nanotubes, when used as a catalyst carrier of an electrode for a fuel cell, can improve the electrical conductivity of the fuel cell. In addition, a fuel cell employing the electrode has excellent efficiency and overall performance.

Description

technical field [0001] The present invention relates to a carbon nanotube, including its loaded catalyst, and a fuel cell using the loaded catalyst, more particularly, the present invention relates to a carbon nanotube with excellent electrical conductivity, including its loaded A catalyst, and a fuel cell having excellent performance by using the supported catalyst. Background technique [0002] A fuel cell is an energy conversion device that converts energy stored in a fuel into electrical energy through an electrochemical reaction between the fuel and an oxidizing gas. Fuel cells can be classified into solid oxide electrolyte fuel cells utilizing solid oxide electrolytes, which can operate at 1000°C; molten carbonate fuel cells, which can operate at 500-700°C; phosphoric acid electrolyte fuel cells, which can operating at about 200°C; and alkaline electrolyte fuel cells and solid polymer electrolyte fuel cells capable of operating at room temperature or at temperatures o...

Claims

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Application Information

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IPC IPC(8): C01B31/02B01J32/00H01M8/02B82B3/00
CPCC01B2202/32Y02E60/50B82Y40/00B82Y30/00Y02E60/523B01J35/1019B01J21/185B01J23/745C01B31/0233H01M4/926H01M4/92B01J23/75H01M4/90C01B2202/22H01M4/9083B01J23/755C01B31/0226B01J37/0203B01J35/1023C01B32/16C01B32/162B01J35/617B01J35/615E04G9/06
Inventor 许廷娜李晶姬郑太远朴相铉
Owner SAMSUNG SDI CO LTD
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