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Method for preparing Au-cluster/carbon nano tube composite catalyst

A composite catalyst and fuel cell technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems that have not yet been published in literature or patent reports, and achieve the effects of reduced preparation costs, high initial potential, and strong durability

Inactive Publication Date: 2016-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention uses multi-walled carbon nanotubes and auric acid to directly synthesize monodisperse composite materials, and no published literature or patent reports have been seen yet.

Method used

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  • Method for preparing Au-cluster/carbon nano tube composite catalyst
  • Method for preparing Au-cluster/carbon nano tube composite catalyst
  • Method for preparing Au-cluster/carbon nano tube composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to the mass ratio of gold element and carbon element of 1:2, mix the chloroauric acid solution with a concentration of 2mg / mL and the aqueous dispersion of multi-walled carbon nanotubes with a concentration of 1mg / mL in sequence ; And this mixture is ultrasonic 2h, so that it is evenly mixed.

[0027] (2) At room temperature, stir magnetically at a speed of 500r / min for 0.5h, then raise the speed to 1000r / min, and mix 4mg of sodium borohydride (NaBH 4 ) into the mixed liquid rapidly, and continue magnetic stirring for 0.5h to obtain the Au / CNT composite material catalyst.

[0028] Catalytic performance test:

[0029] The electrochemical test and characterization was carried out in a test cell with a three-electrode system on a CHI750E electrochemical workstation produced by Shanghai Chenhua Company. Among them, the platinum wire is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the glassy carbon electrode loaded with the cat...

Embodiment 2

[0035] (1) According to the mass ratio of gold element and carbon element of 1:4, the chloroauric acid solution with a concentration of 2mg / mL and the aqueous dispersion of multi-walled carbon nanotubes with a concentration of 1mg / mL were mixed in sequence ; And this mixture is ultrasonic 2h, so that it is evenly mixed.

[0036] (2) At room temperature, stir magnetically at a speed of 500r / min for 0.5h, then raise the speed to 1000r / min, and mix 4mg of sodium borohydride (NaBH 4 ) into the mixed liquid rapidly, and continue magnetic stirring for 0.5h to obtain the Au / CNT composite material catalyst.

Embodiment 3

[0038] (1) According to the mass ratio of gold element and carbon element of 1:1, mix the chloroauric acid solution with a concentration of 2mg / mL and the aqueous dispersion of multi-walled carbon nanotubes with a concentration of 1mg / mL in sequence ; And this mixture is ultrasonic 2h, so that it is evenly mixed.

[0039] (2) At room temperature, stir magnetically at a speed of 500r / min for 0.5h, then raise the speed to 1000r / min, and mix 4mg of sodium borohydride (NaBH 4 ) into the mixed liquid rapidly, and continue magnetic stirring for 0.5h to obtain the Au / CNT composite material catalyst.

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Abstract

The invention discloses a method for preparing an Au-cluster / carbon nanotube composite catalyst. The method has the advantages that (1) the prepared Au / CNT composite catalyst has high onset potential, cycling stability and durability, and greatly improves catalytic activity of cathodic reaction of fuel cells; (2) the catalyst is prepared through in-situ reduction of a multiwalled carbon nanotube and chloroauric acid, the preparation method is simple and direct under mild reaction conditions with no high temperature and high pressure required, thus the synthetic process is greatly simplified and production cost is decreased; and (3) according to the preparation process, water serves as solvent instead of poisonous harmful organic solvent, at the meantime the preparation process is conducted under room temperature, which is energy-saving and environmentally-friendly and highly fits to the idea of green development and the development requirement on new energies of the modern society, thus the Au-cluster / carbon nanotube composite catalyst has a good market prospect.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a cathode composite catalyst for a fuel cell, and belongs to the technical field of new energy materials. Background technique [0002] Fuel cells have the advantages of high conversion efficiency, clean and pollution-free, and low noise. They can be applied to large power plants, small functional equipment, vehicles, etc. Therefore, it is the general trend to become the main energy source in the 21st century. The oxygen reduction reaction is always accompanied by a high overpotential, up to several hundred millivolts. Such a high overpotential has many adverse effects on the battery. Especially in acidic electrolytes, the standard electrode potential of the oxygen reduction reaction is 1.23V (relative to the hydrogen standard). The adsorption of oxygen ions, or the formation of an oxide film, changes the state of the electrode surface, resulting in a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9041H01M4/9083Y02E60/50
Inventor 唐正华李娜王立开
Owner SOUTH CHINA UNIV OF TECH
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