SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof

A noble metal catalyst and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as air pollution, Pt catalyzed oxygen reduction reaction activity reduction, etc., to avoid the formation of alloys, improve the anti-SO2 poisoning performance, reduce The effect of competitive adsorption

Inactive Publication Date: 2019-03-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode fuel of the fuel cell is air, but due to industrial waste gas and automobile exhaust emissions, the air pollution is becoming more and more serious, and the SO in the air 2 Other gases seriously exceed the standard
These SOs 2 will be adsorbed on the active site of Pt, and O 2 Competitive adsorption is formed, resulting in a greatly reduced reactivity of Pt-catalyzed oxygen reduction
However, existing catalysts used in fuel cells are not very resistant to SO 2 poison

Method used

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  • SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof
  • SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof
  • SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An anti-SO 2 The preparation method of the poisoned fuel cell oxygen reduction precious metal catalyst, the specific steps are as follows:

[0048] (1) Synthesis of Ru / C

[0049] ①Put 100mg of carbon powder in a bottle, add 15ml of water, and ultrasonically disperse it at 30°C with 100W power for 20 minutes to obtain a carbon powder slurry;

[0050] ②Take a 250ml beaker and add 150ml of ultrapure water, add the carbon powder slurry of step ① into the beaker, and stir for 10 minutes with a rotor;

[0051] ③Add 540mg of urea to the stirred solution in step ②, and stir for 10 minutes;

[0052] ④ Take 5.577ml of RuCl with a concentration of 53.79mM 3 The aqueous solution is added to the stirred solution in step ③, and stirred for 10 minutes to obtain a mixed solution;

[0053] ⑤ Put the beaker containing the mixed solution in step ④ in a water bath, heat at 90°C for 5 hours, stop heating, and stir to dissipate heat to room temperature;

[0054] ⑥Centrifuge the mixed solution that has b...

Embodiment 2

[0065] Example 2 Ru@Pt / C diffraction results

[0066] Diffracting the Ru@Pt / C and Ru / C prepared in Example 1, the XRD pattern results are as follows figure 1 As shown, the diffraction peak of Ru / C corresponds to the standard diffraction peak of Ru, indicating that the prepared Ru / C is a simple substance of Ru. The diffraction pattern of Ru@Pt / C showed the standard diffraction peaks of Pt and Ru, and the position of the diffraction peaks did not shift, indicating that Pt and Ru were not alloyed.

Embodiment 3

[0067] Example 3 Electron microscope observation results of Ru@Pt / C

[0068] The Ru@Pt / C prepared in Example 1 was observed under transmission electron micrograph (TEM) and high resolution transmission electron microscope (High resolution transmission electron microscopy image, HRTEM), the results are as follows Figure 2-4 As shown, it shows that the metal nanoparticles are uniformly distributed, and new lattice fringes appear around the Ru nanoparticles, corresponding to the (111) crystal plane of Pt, indicating that Pt is wrapped on the surface of the Ru nanoparticles to form a Ru@Pt core-shell structure .

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Abstract

The invention discloses a SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst and preparation method and application thereof. In the SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst, the absorption energy of a SO2 oxide on Pt is changed by a catalyst metal core modification surface layer Pt electron structure, the competitive absorption with active oxygen-containing particle is reduced, and active sites can be timely released. With the SO2 toxicity-resistant fuel cell oxygen-reduction nobel metal catalyst disclosed by the invention, the toxicity-resistant performance of the catalyst is improved on the basis that the oxygen-reduction activity is not reduced; and compared with commercial Pt / C, the catalyst prepared by the invention has the advantagesthat the SO2 toxicity-resistant performance is obviously improved, and the commercial development of a fuel cell is favorably promoted.

Description

Technical field [0001] The present invention relates to the field of fuel cells, and more specifically to an anti-SO 2 A poisoned fuel cell oxygen reduction noble metal catalyst and its preparation method and application. Background technique [0002] At present, with the increasingly serious environmental problems caused by the burning of coal and other fossil fuels, the research and development of hydrogen energy and fuel cells have received more and more attention from governments and scientific circles around the world. Fuel cells are considered to be a new energy technology that is most likely to replace existing energy sources on a large scale due to its rich and diverse fuel sources, high energy conversion efficiency, and low environmental impact (zero or low emissions). One of the important technical means for energy problems and serious environmental pollution caused by burning fossil energy. The cathode fuel of fuel cells is air, but due to industrial exhaust gas and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/8825H01M4/9041H01M4/921Y02E60/50
Inventor 尹鸽平刘玉鑫杜磊王雅静孔凡鹏左朋建杜春雨
Owner HARBIN INST OF TECH
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