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Surface modification method of catalyst used for fuel cells

A technology of fuel cells and catalysts, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced electrochemical active area, increased overpotential, platinum nanoparticle poisoning, etc., to facilitate large-scale production and simple method Effect

Active Publication Date: 2016-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, platinum is very expensive, and commercial carbon-supported platinum oxygen reduction catalysts account for more than 55% of the cost of the entire fuel cell
At the same time, in the fuel cell reaction environment, platinum nanoparticles will be dissolved, agglomerated, poisoned, the electrochemically active area will be reduced, and the catalytic activity will be reduced, resulting in an increase in the overpotential of the fuel cell reaction, especially the cathode oxygen reduction reaction.

Method used

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  • Surface modification method of catalyst used for fuel cells
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  • Surface modification method of catalyst used for fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Take 600 μL of 120.0 mM HO 2 PtCl 6 The aqueous solution was placed in a three-necked flask, and 55.0 mg of cetyltrimethylammonium bromide, 60.0 mg of ascorbic acid, and 60.0 ml of deionized water were added, and stirred to make the solution evenly mixed.

[0028] 2. Transfer the above solution to an oil bath at 100° C., heat and stir for 3 hours, add 5.3 mg of silver nitrate, react in an oil bath at 100° C. for 2 hours, and cool to room temperature.

[0029] 3. Add 50.0 mg of XC72 to the above solution, ultrasonically disperse it evenly, stir at room temperature for 12 hours, centrifuge, wash and dry.

[0030] 4. Mix 5 mg of the above catalyst with 2.5 ml of isopropanol and 20 μL of 5% Nafion aqueous solution, ultrasonically disperse the catalyst and Nafion in isopropanol evenly, take 6 μL of the suspension and apply it to a glassy carbon electrode, and use it as a working solution in a three-electrode system electrode, a platinum sheet as the counter electrode, a...

Embodiment 2 5

[0039] The steps are the same as in Example 1, except that the quality of silver nitrate added is 1.1 mg, 2.2 mg, 3.5 mg, and 11.0 mg, respectively, which are recorded as Pt 10 Ag 1 C. Pt 5 Ag 1 C. Pt 3 Ag 1 C. Pt 1 Ag 1 c.

[0040] Figure 6 for Pt 1 Ag 1 TEM image of C.

[0041] Figure 7 for Pt 10 Ag 1 C. Pt 5 Ag 1 C. Pt 3 Ag 1 C. Pt 2 Ag 1 C and Pt 1 Ag 1 XRD pattern of C before electrochemical treatment.

Embodiment 6

[0043] 1. Take 600 μL of 120.0 mM K 2 PtCl 4 The aqueous solution was placed in a three-necked flask, and 55.0 mg of cetyltrimethylammonium chloride, 60.0 mg of ascorbic acid, and 60.0 ml of deionized water were added, and stirred to make the solution evenly mixed.

[0044] 2. Transfer the above solution to an oil bath at 80°C, heat and stir for 3 hours, add 5.2mg CuSO 4 , reacted in an oil bath at 80°C for 2 hours, and cooled to room temperature.

[0045] 3. Add 50 mg of XC72 to the above solution, ultrasonically disperse it evenly, stir at room temperature for 12 hours, centrifuge, wash and dry.

[0046] 4. Mix 5.0 mg of the above catalyst with 2.5 ml of isopropanol and 20 μL of 5% Nafion aqueous solution, ultrasonically disperse the catalyst and Nafion in isopropanol evenly, take 6 μL of the suspension and apply it to a glassy carbon electrode, and use it as a three-electrode system Working electrode, platinum sheet as counter electrode, saturated calomel electrode as re...

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Abstract

The invention relates to a surface modification method of a catalyst used for fuel cells. According to the surface modification method, platinum family metal nano particle surface modification is carried out with iron, cobalt, nickel, copper, palladium, or silver in a solution. It is shown by tests that the oxygen reduction catalytic activity of a platinum family catalyst obtained via surface modification is as high as 6.7 times of that of commercialized catalysts. The catalyst prepared via the surface modification method possesses large application potential in the fields of proton exchange membrane fuel cells and direct methanol fuel cells.

Description

technical field [0001] The invention relates to a method for surface modification of catalysts for fuel cells. Background technique [0002] The ever-increasing use of fossil fuels and the limited supply of natural resources have severely stimulated human beings to seek and utilize renewable energy. A fuel cell is a device for converting and utilizing clean energy. Among various fuel cells, proton exchange membrane fuel cells (PEMFC) show the advantages of high energy density, low operating temperature, and low environmental impact, and are promising as power supplies for mobile electronic devices, vehicles, and fixed grids. In PEMFC, the fuel (such as H 2 ) is oxidized at the anode, the oxidizing agent (O 2 ) is reduced at the cathode, thereby storing in H 2 Convert chemical energy into electrical energy. In a fuel cell, the fuel can be hydrogen, methanol, ethanol or formic acid, and highly electronegative O 2 Accepts electrons as an oxidizing agent. Although PEMFC h...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCY02E60/50
Inventor 邵志刚曹龙生高原秦晓平唐雪君衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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