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Preparation method of carbon-loaded nano-palladium catalyst for direct methanol fuel cell

A methanol fuel cell and nano-palladium technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of decreased resistance to methanol poisoning, high price, and difficulty in large-scale commercial application of direct methanol fuel cells

Inactive Publication Date: 2016-11-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although Pt-based composite catalysts have better resistance to methanol poisoning than pure Pt catalysts, their resistance to methanol poisoning will decrease with the loss of other composite components in the composite catalyst after long-term operation.
Moreover, due to the constraints of expensive and scarce resources of traditional Pt catalysts, direct methanol fuel cells are difficult to achieve large-scale commercial applications.

Method used

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  • Preparation method of carbon-loaded nano-palladium catalyst for direct methanol fuel cell
  • Preparation method of carbon-loaded nano-palladium catalyst for direct methanol fuel cell
  • Preparation method of carbon-loaded nano-palladium catalyst for direct methanol fuel cell

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Experimental program
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Effect test

Embodiment approach 1

[0024] Embodiment 1: in the 2nd step of the preparation process, add 2.4ml ammonia water; in the 3rd step of the preparation process, NaBH 4 The dosage is 170 mg; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as figure 1 shown. figure 1 It was shown that palladium nanoparticles were successfully supported on the surface of activated carbon support. figure 2 is the resulting catalyst in 0.1M KOH+1M CH 3 CV curves in OH mixed solution. The current density of the CV curves was normalized by the mass of the catalyst. From figure 2 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.15V. At this potential, the current density of methanol electrochemical oxidation is 11.3mA·mg -1 catalyst.

Embodiment approach 2

[0025] Embodiment two: in the 2nd step of the preparation process, add 3ml of ammonia water; in the 3rd step of the preparation process, NaBH 4 The dosage is 170 mg; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as image 3 shown. image 3 It was shown that palladium nanoparticles were successfully loaded on the surface of activated carbon support. Figure 4 is the resulting catalyst in 0.1M KOH+1M CH 3 CV curves in OH mixed solution. The current density of the CV curves was normalized by the mass of the catalyst. From Figure 4 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.15V. At this potential, the current density of the electrochemical oxidation of methanol is 16.6mA·mg -1 catalyst.

Embodiment approach 3

[0026] Embodiment three: in the 2nd step of the preparation process, add 3.6ml ammonia water; in the 3rd step of the preparation process, NaBH 4 The dosage is 170 mg; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as Figure 5 shown. Figure 5 It was shown that palladium nanoparticles were successfully loaded on the surface of activated carbon support. Figure 6 is the resulting catalyst in 0.1M KOH+1M CH 3 CV curves in OH mixed solution. The current density of the CV curves was normalized by the mass of the catalyst. From Figure 6 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.17V. At this potential, the current density of the electrochemical oxidation of methanol is 6.9mA·mg -1 catalyst.

[0027] Embodiment four: in the 2nd step of preparation process, add 3ml ammoniacal liquor; In the 3rd step of preparation process, NaBH ...

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Abstract

The invention discloses a preparation method of a carbon-loaded nano-palladium catalyst for a direct methanol fuel cell. The method comprises the steps that the carbon-loaded nano-palladium catalyst is prepared by taking NbBH4 as a reducing agent in the presence of polyvinylpyrrolidone after the acid-base property of a reaction system is regulated by adding ammonia water. The morphology of palladium nanoparticles in the carbon-loaded nano-palladium is represented through a transmission electron microscope. The electrochemical oxidation activity of the carbon-loaded nano-palladium catalyst on methanol is evaluated through cyclic voltammetry.

Description

technical field [0001] The invention relates to a preparation method of a carbon-supported nano-palladium catalyst for direct methanol fuel cells, belonging to the technical fields of fuel cell materials and electrocatalysts. Background technique [0002] A fuel cell is a power generation device that converts the chemical energy of fuel directly into electrical energy through electrode reactions. It has the characteristics of low environmental pollution and low noise, and is known as the preferred clean and efficient power generation technology in the 21st century. This high-efficiency and clean power generation system, which directly converts chemical energy into electrical energy continuously, has received extensive attention since its inception. Because methanol fuel has the advantages of high energy density, high energy efficiency, and easy transportation and storage, direct methanol fuel cells have broad potential applications in portable power devices and electric veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92
CPCH01M4/926Y02E60/50
Inventor 闫少辉徐光宇岳秀萍徐明德高利珍张禹巍
Owner TAIYUAN UNIV OF TECH
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