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Post-processing method for carbon-supported Pt-Fe catalyst

A catalyst and carbon-supported technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as complex methods and harsh conditions, achieve simple methods, improve catalytic oxidation, and overcome stability Sexually low effect

Inactive Publication Date: 2014-08-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a post-treatment method for carbon-supported PtFe catalysts in order to solve the defects of harsh conditions and complicated methods of the existing carbon-supported PtFe catalyst post-treatment methods

Method used

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  • Post-processing method for carbon-supported Pt-Fe catalyst
  • Post-processing method for carbon-supported Pt-Fe catalyst
  • Post-processing method for carbon-supported Pt-Fe catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) FeCl 3 、H 2 PtCl 6 and VulcanXC-72 are uniformly dispersed in the aqueous solution, and the substances contained in it are prepared according to the mass ratio of Fe:Pt:C=10:10:80 to prepare a mixed suspension, and mix well;

[0045] 2) Place the suspension in 1) in a water bath at 50°C, evaporate the solvent to dryness, and obtain a black powder;

[0046] 3) Put 2) the black powder in H 2 / N 2 (10%H 2 ) in a tube furnace at 500°C for 3 hours to obtain the original PtFe / C catalyst;

[0047]4) soak 3) the original PtFe catalyst in 0.5molL -1 In the sulfuric acid solution, keep at 80°C, and magnetically stir for 24 hours to obtain a black suspension;

[0048] 5) Cool the black suspension described in 4) to room temperature, suction filter, wash, and vacuum-dry at 80° C. for 8 hours to obtain a chemically dealloyed PtFe / C catalyst.

[0049] Add 5 mg of the above-mentioned chemical dealloying PtFe / C catalyst to 50 μL of the Nafion solution produced by Ladrich wit...

Embodiment 2

[0051] 1) FeCl 3 、H 2 PtCl 6 and VulcanXC-72 are uniformly dispersed in the aqueous solution, and the substances contained in it are prepared according to the ratio of mass ratio Fe:Pt:C=13:7:80 to prepare a mixed suspension, and mix well;

[0052] 2) Place the suspension in 1) in a water bath at 50°C, evaporate the solvent to dryness, and obtain a black powder;

[0053] 3) Put 2) the black powder in H 2 / N 2 (10%H 2 ) in a tube furnace at 500°C for 3 hours to obtain the original PtFe / C catalyst;

[0054] 4) soak 3) the original PtFe catalyst in 0.5molL -1 In the sulfuric acid solution, keep at 80°C, and magnetically stir for 24 hours to obtain a black suspension;

[0055] 5) Cool the black suspension described in 4) to room temperature, suction filter, wash, and vacuum-dry at 80° C. for 8 hours to obtain a chemically dealloyed PtFe / C catalyst.

[0056] Add 5 mg of the above-mentioned chemical dealloying PtFe / C catalyst to 50 μL of the Nafion solution produced by Ladri...

Embodiment 3

[0058] 1) FeCl 3 、H 2 PtCl 6 and VulcanXC-72 are evenly dispersed in the aqueous solution, and the substances contained in it are prepared according to the mass ratio of Fe:Pt:C=15:5:80 to prepare a mixed suspension, and mix well;

[0059] 2) Place the suspension in 1) in a water bath at 50°C, evaporate the solvent to dryness, and obtain a black powder;

[0060] 3) Put 2) the black powder in H 2 / N 2 (10%H 2 ) in a tube furnace at 500°C for 3 hours to obtain the original PtFe / C catalyst;

[0061] 4) soak 3) the original PtFe catalyst in 0.5molL -1 In the sulfuric acid solution, keep at 80°C, and magnetically stir for 24 hours to obtain a black suspension;

[0062] 5) Cool the black suspension described in 4) to room temperature, suction filter, wash, and vacuum-dry at 80° C. for 8 hours to obtain a chemically dealloyed PtFe / C catalyst.

[0063] Add 5 mg of the above-mentioned chemical dealloying PtFe / C catalyst to 50 μL of the Nafion solution produced by Ladrich with a...

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Abstract

The invention provides a post-processing method for carbon-supported Pt-Fe catalyst, belongs to the field of catalyst post-processing methods, and overcomes the defects that the conventional post-processing method for the carbon-supported Pt-Fe catalyst is harsh in conditions and complex. The method comprises the following steps: immersing the carbon-supported Pt-Fe catalyst into sulfuric acid solution, and stirring at 70 to 90 DEG C to obtain suspension liquid; cooling, washing and drying the suspension liquid to obtain chemically de-alloyed carbon-supported Pt-Fe catalyst. According to the method, Fe on the surfaces of carbon-supported Pt-Fe nano-particles is removed in the sulfuric acid solution by controlling reaction conditions, the catalytic oxidation effect of Pt on methanol is improved by utilizing the strong electronic effect of the Fe in the carbon-supported Pt-Fe catalyst on the Pt, and meanwhile, the problem that the stability of the Pt-Fe catalyst is low is solved. The quality specific activity of the chemically de-alloyed carbon-supported Pt-Fe catalyst prepared by the invention can reach 514 mA / mg<2>; through four-hour timing current test, 45.4 percent of catalytic performance can be remained.

Description

technical field [0001] The invention belongs to the field of post-treatment methods for catalysts, in particular to a post-treatment method for carbon-supported PtFe catalysts. Background technique [0002] Direct methanol fuel cells (DMFCs) have the advantages of environmental friendliness, high energy conversion efficiency, low battery operating temperature, and easy handling of liquid fuels, making them great potentials as power sources for vehicles and portable electronic devices. However, the commonly used catalyst for methanol electrooxidation at the anode is Pt, and its high price seriously hinders the commercialization process of methanol fuel cells. To solve this problem, a PtM alloy catalyst formed by Pt and another non-noble metal M was used to improve the performance of methanol electrooxidation and reduce the loading of Pt. However, the non-noble metal M contained therein is easily soluble in the acidic environment of fuel cell operation, and cannot achieve con...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/00H01M4/92
CPCY02E60/50
Inventor 邢巍吕青肖瑶
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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