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Method for preparing direct methanol fuel cell Pt-Ru/C catalyst

A methanol fuel cell, ruthenium catalyst technology, applied in the direction of catalyst activation/preparation, solid electrolyte fuel cells, chemical instruments and methods, etc., can solve the problems of limited industrialization process, low catalyst activity, high anode polarization, etc. Low amount, simple steps, high electrocatalytic oxidation activity

Inactive Publication Date: 2010-01-27
江苏雷石新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Direct methanol fuel cell (DMFC) is a device that directly converts the chemical energy in methanol and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high energy density, wide range of fuel sources, and no need for charging. Many technical aspects are not mature enough, and there are still many deficiencies, which limit the process of its industrialization
[0003] The electrode catalyst is an important part of the direct methanol fuel cell. The existing anode catalyst is mainly Pt-Ru / C. The Pt-Ru / C catalyst prepared by the current technology mainly has the following problems: (1) low catalyst activity , high anodic polarization; (2) high loading capacity, reaching 2-4mg / cm 2 (3) prone to CO poisoning

Method used

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Effect test

Embodiment 1

[0023] In this embodiment, the preparation steps of the carbon-supported platinum ruthenium catalyst for the direct methanol fuel cell are as follows:

[0024] (1) Activated carbon is added to sodium dodecylsulfonate, and ultrasonically oscillated for 1 hour at room temperature to obtain a dispersed slurry;

[0025] (2) adding an aqueous solution of chloroplatinic acid and ruthenium trichloride, and ultrasonically vibrating for 1.5 hours at room temperature to obtain a dispersed slurry, wherein the mass ratio of activated carbon: platinum: ruthenium is 50:2:1;

[0026] (3) Add excess sodium borohydride dropwise for reduction, and reflux at 75° C. for 4 hours;

[0027] (4) After the reaction is complete, filter, wash, and dry to obtain a finished catalyst Pt-Ru / C in which platinum and ruthenium are electrodeposited on a carbon support.

Embodiment 2

[0029] In this embodiment, the preparation steps of the carbon-supported platinum ruthenium catalyst for the direct methanol fuel cell are as follows:

[0030] (1) adding carbon nanotubes to sodium dodecylbenzenesulfonate, and ultrasonically oscillating at room temperature for 1.5 hours to obtain a dispersed slurry;

[0031] (2) adding an aqueous solution of platinum tetrachloride and ruthenium trichloride, and ultrasonically vibrating for 2 hours at room temperature to obtain a dispersed slurry, wherein the mass ratio of activated carbon: platinum: ruthenium is 50:2:1;

[0032] (3) adding excess formaldehyde dropwise for reduction, and reflux at 85° C. for 3.5 hours;

[0033] (4) After the reaction is complete, filter, wash, and dry to obtain a finished catalyst Pt-Ru / C in which platinum and ruthenium are electrodeposited on a carbon support.

Embodiment 3

[0035] In this embodiment, the preparation steps of the carbon-supported platinum ruthenium catalyst for the direct methanol fuel cell are as follows:

[0036] (1) adding carbon fibers to a mixed solution of sodium dodecylsulfonate and sodium dodecylbenzenesulfonate, and ultrasonically vibrating for 2 hours at room temperature to obtain a dispersed slurry;

[0037] (2) Add an aqueous solution of platinum tetrachloride and ruthenium trichloride, and ultrasonically vibrate for 2.5 hours at room temperature to obtain a dispersed slurry, wherein the mass ratio of activated carbon: platinum: ruthenium is 50:2:1;

[0038] (3) Add excess formic acid dropwise for reduction, and reflux at 90° C. for 3.5 hours;

[0039] (4) After the reaction is complete, filter, wash, and dry to obtain a finished catalyst Pt-Ru / C in which platinum and ruthenium are electrodeposited on a carbon support.

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Abstract

The invention relates to a method for preparing direct methanol fuel cell Pt-Ru / C catalyst, which is characterized by comprising the following steps: (1) adding a carbon carrier into surface active agent and carrying out ultrasonic oscillation to obtain dispersed slurry; (2) adding an aqueous solution of a Pt compound and an Ru compound and carrying out the ultrasonic oscillation to obtained dispersed slurry; (3) dropwise adding a reducing agent for reducing; (4) completely reacting and then filtering, washing and drying to obtain the finished Pt-Ru / C catalyst of which Pt and Ru are electrically deposited on the carbon carrier. The invention has the following technical advantages that: (1) simple step, mild operation condition and easy mass production are achieved; and (2) the Pt-Ru / C catalyst prepared by the method can be used as a positive electrode catalyst and has high electro-catalysis oxidative activity of the methanol and lower carrying capacity which is only 1-2mg / cm<2> lower than common 2-4 mg / cm<2> and higher CO poisoning resistance.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for a fuel cell, in particular to a method for preparing a carbon-supported platinum-ruthenium catalyst for a direct methanol fuel cell, and belongs to the field of fuel cells. Background technique [0002] Direct methanol fuel cell (DMFC) is a device that directly converts the chemical energy in methanol and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high energy density, wide range of fuel sources, and no need for charging. Many technical aspects are not mature enough, and there are still many deficiencies, which limit the process of its industrialization. [0003] The electrode catalyst is an important part of the direct methanol fuel cell. The existing anode catalyst is mainly Pt-Ru / C. The Pt-Ru / C catalyst prepared by the current technology mainly has the following problems: (1) low catalyst activity , high anodic polarization; (2) high loadi...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M8/10B01J23/46B01J37/34B01J37/16
CPCY02E60/50Y02P70/50
Inventor 朱长满
Owner 江苏雷石新能源科技有限公司
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