PtRu/C catalyst and its preparation method

A catalyst, ruthenium chloride technology, applied in the field of PtRu/C catalyst and its preparation, can solve the problems of PtRu/C catalyst poor dispersion, poor catalytic performance, harsh reaction conditions, etc., to achieve easy large-scale production, simple method, The effect of improving activity and stability

Inactive Publication Date: 2014-12-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a PtRu / C catalyst and a preparation method thereof in order to solve the problems of poor dispersion, poor catalytic performance and harsh reaction conditions of the PtRu / C catalyst obtained by the existing preparation method

Method used

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  • PtRu/C catalyst and its preparation method
  • PtRu/C catalyst and its preparation method
  • PtRu/C catalyst and its preparation method

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preparation example Construction

[0025] The present invention at first provides a kind of preparation method of PtRu / C catalyst, comprises as follows:

[0026] Step 1: Dispersing the carbon carrier in water to obtain the first suspension;

[0027] Step 2: adding chloroplatinic acid solution and ruthenium chloride solution to the first suspension to obtain the second suspension;

[0028] Step 3: Pour the second suspension into the sodium borohydride solution, and stir at room temperature to obtain the PtRu / C catalyst.

[0029] According to the present invention, firstly, the carbon carrier is dispersed in water to obtain the first suspension; the present invention has no special limitation on the dispersion method, and the method of super-generation dispersion is preferably adopted, and the time of the super-generation dispersion is preferably 1h to 3h, more preferably It is 1.5h to 2.5h, and the carbon carrier can be a carbon carrier well-known to those skilled in the art without special limitation, preferab...

Embodiment 1

[0039] Add 20 mg of activated carbon produced by U.S. Cabot (Cabot) Co., trade name VulcanXC-72 to 40 mL of deionized liquid, and disperse for 2 h in super-life to obtain the first suspension; add 0.03 mmol of chlorine to the first suspension. Platinic acid solution and 0.03mmol ruthenium chloride solution were stirred for 6h to obtain a second suspension; the second suspension was poured into a newly prepared 8mL sodium borohydride solution with a concentration of 5.68mg / mL, and stirred for 12h Finally, the third suspension was obtained; the third suspension was suction-filtered and washed with deionized water with a resistivity of 18.2 MΩ·cm until no chloride ions existed, and the obtained product was vacuum-dried at 80°C.

[0040] The PtRu / C catalyst is ultrasonically dispersed in ethanol to obtain a suspension; the suspension is coated on a copper grid and dried with an electron microscope, and the results can be found in image 3, image 3 For the transmission electron m...

Embodiment 2

[0043] Add 18 mg of activated carbon produced by U.S. Cabot (Cabot) Company and trade name VulcanXC-72 to 40 mL of deionization, and ultrasonically disperse for 2 hours to obtain the first suspension; add 0.03 mmol of chlorine to the first suspension. Platinic acid solution and 0.01mmol ruthenium chloride solution were stirred for 10 hours to obtain a second suspension; the second suspension was poured into newly prepared 8 mL of sodium borohydride solution with a concentration of 1.89 mg / mL, and stirred for 12 hours After that, the third suspension was obtained; the third suspension was suction-filtered and washed with deionized water with a resistivity of 18.2MΩ·cm until no chloride ions existed, and the resulting product was vacuum-dried at 80°C to obtain PtRu / C catalyst.

[0044] The PtRu / C catalyst is ultrasonically dispersed in ethanol to obtain a suspension; the suspension is coated on a copper grid and dried with an electron microscope, and the results can be found in...

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Abstract

The invention provides a preparation method of a PtRu/C catalyst, and belongs to the field of catalyst preparation methods. The method comprises the following steps: dispersing a carbon carrier in water to obtain a first suspension; adding a chloroplatinic acid solution and a ruthenium chloride solution to the first suspension to obtain a second suspension; and pouring the second suspension into a sodium borohydride solution, and stirring at room temperature to obtain the PtRu/C catalyst. The invention also provides the PtRu/C catalyst. The PtRu/C catalyst has the characteristics of small particle size, uniform dispersion, and good methanol electrooxidation reaction catalysis performance. Experiments show that when the capacity of the PtRu/C catalyst prepared through the method is 30wt%, the mass activity of the catalyst in a methanol solution with sulfuric acid as an electrolyte reaches 447mA/mg, and is 1 time higher than the mass activity of commercial PtRu/C catalysts.

Description

technical field [0001] The invention belongs to the field of catalyst preparation methods, and in particular relates to a PtRu / C catalyst and a preparation method thereof. Background technique [0002] A direct methanol fuel cell is a device that uses methanol as fuel to directly convert chemical energy into electrical energy. Due to its high energy conversion efficiency, easy portability and storage, and no pollution, direct methanol fuel cells have received more and more attention and research in recent years. However, due to the complexity of the methanol oxidation process, the anode electro-oxidation activity is not high at low temperatures, resulting in a high anode overpotential. During the oxidation process, complex intermediate products are produced. Some intermediate products are irreversibly adsorbed on the electrode surface and become poisonous species. Reduce catalyst activity, thereby reducing cell efficiency and fuel utilization. Therefore, it is of great sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58H01M4/92
CPCY02E60/50
Inventor 邢巍肖梅玲祝建兵
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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