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Modified Pt-based fuel-cell catalyst and preparation methods thereof

A fuel cell and catalyst technology, applied in the field of electrochemistry, can solve the problems of reduced catalytic activity, poor methanol oxidation kinetics, etc.

Inactive Publication Date: 2012-07-18
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

Methanol oxidation kinetics are poor because traditional anode catalysts are poisoned by CO intermediates, resulting in reduced catalytic activity.

Method used

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  • Modified Pt-based fuel-cell catalyst and preparation methods thereof
  • Modified Pt-based fuel-cell catalyst and preparation methods thereof
  • Modified Pt-based fuel-cell catalyst and preparation methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The Pt-based catalyst was modified by physical adsorption method: the catalyst was a Pt / C catalyst (20% Pt mass content) from a commercial E-teck company, and the heteropolyacid was H 5 PMo 10 V 2 O 40 . Disperse 50mgPt / C catalyst in 20mgml-1 of H 5 PMo 10 V 2 O 40 The solution was fully immersed for 12 hours under mechanical stirring. The mixture is then filtered, and the solid material is dried to obtain H 5 PMo 10 V 2 O 40 Modified Pt / C catalyst. figure 1 for H 5 PMo 10 V 2 O 40 EDX image of the modified Pt / C catalyst, from which obvious Pt, Mo, V peaks can be seen, proving that H 5 PMo 10 V 2 O 40 adsorbed onto the Pt / C catalyst. Disperse 5 mg of the catalyst in a mixture of 1 mL of ethanol and 50 μL of Nafion solution with a mass fraction of 5%, and perform ultrasonic dispersion to prepare a catalyst ink; take 10 μL of the catalyst ink and drop it on the surface of the glassy carbon electrode to prepare a catalyst electrode for methanol Electro...

Embodiment 2

[0048] Modification of Pt-based catalyst by electrochemical method: Disperse 5 mg of the above commercial Pt / C catalyst in a mixture of 1 mL of ethanol and 50 μL, and ultrasonically disperse to make catalyst ink; take 10 μL of catalyst ink and drop it on the surface of glassy carbon electrode to make Catalyst electrode. The electrode was placed in 10 mg ml-1 of H 3 PMo 12 O 40 , H 4 PMo 11 V 1 O 40 Electrochemical cyclic voltammetry scanning was carried out in the heteropolyacid solution, the scanning potential was -0.2-1.0V, at 20mv s -1 Continuous scanning was carried out until the electrochemical behavior was stable, and finally the Pt-based catalyst electrocatalyst modified by the heteropolyacid was obtained. The catalyst electrode was used for the electrocatalytic oxidation of methanol, image 3 is the modified catalyst H 5 PMo 10 V 2 O 40 (A), H 3 PMo 12 O 40 (B) Cyclic voltammograms of electrocatalytic oxidation of methanol with unmodified Pt / C catalyst (C...

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Abstract

The invention provides a modified Pt-based fuel-cell catalyst which is characterized by comprising a Pt-based catalyst and a heteropoly-acid modifier, wherein the heteropoly-acid modifier is adsorbed to the surface of the Pt-based catalyst by using an electrochemical method or a physical adsorption method. The catalyst provided by the invention has a good performance of resisting the poisoning of reactive intermediates such as CO and the like, and a good performance of carrying out catalytic oxidation on methanol. The invention also provides two methods for preparing the modified Pt-based fuel-cell catalyst, by which good-performance modified Pt-based fuel-cell catalysts can be prepared; the preparation methods are simple and easy to operate and short in preparation time; meanwhile, no organic solvent is used, therefore, the methods are environment-friendly and safe.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a modified Pt-based fuel cell catalyst and a preparation method thereof. Background technique [0002] A fuel cell is a device that converts chemical energy directly into electrical energy through an electrochemical reaction. In 1839, Gove first proposed the concept of fuel cells. As an efficient and pollution-free energy conversion device, it has received more and more attention in recent years. At present, the fuel cells put into production and use mainly include the following categories: proton exchange membrane fuel cells (PEMFC), molten carbonate fuel cells (MCFC), and solid oxide fuel cells (SOFC). Among them, proton exchange membrane fuel cells are the most widely used. [0003] At present, in the field of proton exchange membrane fuel cells, in addition to the extensive research and use of proton exchange membrane fuel cells using hydrogen and oxygen fuel, researchers h...

Claims

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Application Information

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IPC IPC(8): H01M4/92B01J31/18
CPCY02E60/50
Inventor 冯立纲刘长鹏孙秀娟廖建辉邢巍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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