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Process for preparation of gas perforated electrode catalyst of nucleus-shell structure

A technology of porous electrodes and catalysts, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effects of easy popularization and application, little influence of human factors, and low production cost

Inactive Publication Date: 2008-07-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a core / shell structure gas porous electrode catalyst for the shortcomings of the existing direct electrodeposited Pt

Method used

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  • Process for preparation of gas perforated electrode catalyst of nucleus-shell structure
  • Process for preparation of gas perforated electrode catalyst of nucleus-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1), preparation of microporous layer

[0043] First, soak the carbon paper in an aqueous ethanol solution, vibrate for 30 minutes under ultrasonic conditions, then soak it in a 30% polytetrafluoroethylene emulsion for 30 minutes, and then bake it in a muffle furnace at a temperature of 340 ° C for 40 minutes to obtain a hydrophobic paper. diffusion layer. Weigh polytetrafluoroethylene and Vulcan XC-72 carbon powder according to the mass ratio of PTFE: Vulcan XC-72 carbon powder is 1:1, then use ethanol as solvent to oscillate evenly under ultrasonic conditions, and apply it several times On the surface of the pretreated carbon paper, it was finally placed in a muffle furnace at a temperature of 340° C. and baked for 45 minutes to obtain a microporous layer.

[0044] (2) Preparation of gas porous electrodes bonded with perfluorosulfonic acid resin

[0045] Perfluorosulfonic acid resin: the mass ratio of Vulcan XC-72 carbon powder is 1: 30 to take perfluorosulfonic aci...

Embodiment 2

[0055] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0056] (3) Preparation of Cu "core" by electrodeposition

[0057] A two-electrode system is adopted, the perfluorosulfonic acid resin bonded gas porous electrode obtained in step (2) is used as the cathode, the metal copper is used as the anode, and the electrolyte is 0.25g / L copper sulfate and 98g / L sulfuric acid solution, electrodeposition The temperature is 10℃, the peak current density is 1A / dm 2 , the pulse on time is 0.1ms, the pulse off time is 0.1ms, and the deposition time is 300s to prepare Cu "core" by electrodeposition.

[0058] (4) Preparation of Cu@Pt "core / shell" catalyst electrode

[0059] After cleaning the Cu "nuclei" prepared in step (3) with ultrapure water, immerse in nitrogen-protected dinitrotetraammonium platinum aqueous solution for replacement, and control the pH of the dinitrotetraammonium platinum aqueous solution to be 8. The concentration is 30g / L, and Cu@Pt "core / shell" catalys...

Embodiment 3

[0062] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0063] (3) Preparation of Cu "core" by electrodeposition

[0064] A two-electrode system is adopted, the perfluorosulfonic acid resin bonded gas porous electrode obtained in step (2) is used as the cathode, the metal copper is used as the anode, and the electrolyte is 0.25g / L copper sulfate and 98g / L sulfuric acid solution, electrodeposition The temperature is 10℃, the peak current density is 1A / dm 2 , the pulse on time is 0.1ms, the pulse off time is 0.1ms, and the deposition time is 300s to prepare Cu "core" by electrodeposition.

[0065] (4) Preparation of Cu@Pt "core / shell" catalyst electrode

[0066] After cleaning the Cu "nuclei" prepared in step (3) with ultrapure water, immerse in nitrogen-protected dinitrotetraammonium platinum aqueous solution for replacement, and control the pH of the dinitrotetraammonium platinum aqueous solution to be 8. The concentration is 30g / L, and Cu@Pt "core / shell" catalys...

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Abstract

The invention provides a method for preparing a core-shell structure gas porous electrode catalyst, which belongs to the field of fuel cells. First, a homogeneously dispersed non-platinum-group transition metal M core is optionally deposited on a gas porous electrode which is bonded on perfluoro sulfonic acid resin, and then a M@Pt core-shell type catalyst is made through a chemical replacement reaction between the deposited non-platinum-group transition metal M core and a platinum salt solution. The invention has the advantages of simple process and low cost. The M@Pt core-shell type catalyst which is prepared by the invention is capable of effectively reducing the amount of precious metal platinum, improving the utilization ratio of the catalyst, and the catalyst is capable of replacing a prior commercial Pt / C catalyst.

Description

1. Technical field: [0001] The invention belongs to the field of fuel cells, in particular to a preparation method of a gas porous electrode catalyst with a core / shell structure. 2. Background technology: [0002] Fuel cell (FC) is the most effective device for converting chemical energy into electrical energy. In the process of fuel cell industrialization, its cost problem has always been one of the core issues that plague its development. Currently, fuel cell membrane electrodes (MEA) account for 84% of the cost of the battery stack, of which the positive and negative electrodes containing noble metal catalysts account for 54% of the MEA. Using non-precious metal catalysts, or reducing the amount of precious metal catalysts in MEA and improving their utilization efficiency are the main ways to reduce the cost of MEA. At present, the catalytic activity of non-precious metal catalysts cannot meet the technical requirements of low-temperature starting hydrogen-oxygen proton ...

Claims

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Application Information

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IPC IPC(8): H01M4/88B01J37/00
CPCY02E60/50
Inventor 魏子栋冯永超陈四国符颖
Owner CHONGQING UNIV
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