Pt-Au@Pt core-shell structure fuel cell cathode catalyst and preparation method thereof

A fuel cell cathode, core-shell structure technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low coverage, low catalytic activity, low Pt coverage on the catalyst surface, etc. The effect of improving quality and activity, enriching resources, and solving the problem of catalyst resources

Inactive Publication Date: 2013-05-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although the method of underpotential deposition of Cu monolayer on the surface of Au nanoparticles and then Pt replacement can make Pt uniformly dispersed on the Au surface, but the research shows that

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  • Pt-Au@Pt core-shell structure fuel cell cathode catalyst and preparation method thereof
  • Pt-Au@Pt core-shell structure fuel cell cathode catalyst and preparation method thereof
  • Pt-Au@Pt core-shell structure fuel cell cathode catalyst and preparation method thereof

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[0033] The preparation method includes the steps: 1) In the mixed solution of the gold compound and sodium citrate, sodium borohydride is added to reduce the gold compound to obtain Au nanoparticles. Then the Au particles are loaded on the surface of the carbon support to obtain carbon-supported Au, which is recorded as Au / C.

[0034] 2) Place Au / C in an aqueous solution of platinum compound without adding a reducing agent to allow Pt to be spontaneously reduced on the Au surface. After centrifugation and drying, the supported Pt-Au alloy nanoparticles are obtained, where the reduction temperature is 20-100 ℃, the concentration of platinum compound is 10 -5 mol / L ~10 -2 mol / L.

[0035] 3) Coating the Pt-Au alloy nanoparticles obtained by spontaneous reduction on the surface of the electrode, and obtaining a Cu atomic layer through the method of under-potential deposition, and the Cu prepared by this method is called UPD Cu. The electrode is immersed in the replacement solution t...

Example Embodiment

[0037] Example 1

[0038] 1) Pt-AuPt / C core-shell structure catalyst Pt 0.2 AuPt 0.15 / C preparation

[0039] In the mixed solution of chloroauric acid and sodium citrate, add sodium borohydride to reduce the chloroauric acid, stir evenly, after the solution turns purple-red, add the conductive carrier, after immersing for 36 hours at room temperature, centrifugation and vacuum drying to obtain the carbon carrier Au, namely Au / C;. Put Au / C at a concentration of 10 -4 mol / L ~10 -3 mol / L potassium chloroplatinate aqueous solution, stir for 24 hours at 25°C to obtain Pt 0.2 Au / C alloy. Pt 0.2 The Au / C alloy is coated on the surface of the electrode, the electrode potential is controlled, and Cu is deposited at a constant potential under the Cu under-potential deposition potential to obtain an electrode of Cu atomic layer. The electrode with UPD Cu monolayer is immersed in the replacement liquid potassium chloroplatinate solution for 30 minutes, so that Pt replaces the Cu atoms on ...

Example Embodiment

[0045] Example 2

[0046] 1) Pt-AuPt / C core-shell structure catalyst Pt 0.1 AuPt 0.17 / C preparation

[0047] In the mixed solution of chloroauric acid and sodium citrate, add sodium borohydride to reduce the chloroauric acid, stir evenly, after the solution turns purple-red, add the conductive carrier, after immersing at room temperature for 48 hours, centrifugation and vacuum drying to obtain the carbon carrier Au, namely Au / C; put Au / C at a concentration of 10 -5 mol / L ~10 -4 mol / L potassium chloroplatinate aqueous solution, stirred at 30°C for 12 hours to obtain Pt 0.1 Au / C alloy. Pt 0.1 The Au / C alloy is coated on the surface of the electrode, the electrode potential is controlled, and Cu is deposited at a constant potential under the Cu under-potential deposition potential to obtain an electrode of Cu atomic layer. The electrode with UPD Cu monolayer is soaked in the replacement liquid potassium chloroplatinate solution for 15 minutes, so that Pt replaces the Cu atoms on t...

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Abstract

The invention discloses a Pt-Au@Pt core-shell structure fuel cell cathode catalyst and a preparation method thereof. The Pt-Au@Pt core-shell structure fuel cell cathode catalyst consists of a conductive carrier and Pt-Au@Pt core-shell structure nanoparticles. The preparation method comprises the following steps of: reducing a gold compound by using sodium borohydride to obtain Au nanoparticles, and loading the Au particles on the surface of a carbon carrier to obtain Au/C; and putting Au/C in a platinum compound water solution to obtain loaded-type Pt/Au alloy nanoparticles after Pt is subjected to spontaneous reductive deposition on the Au surface, depositing a Cu atom monolayer on the surface of the Pt-Au alloy nanoparticles by using an underpotential deposition method and then displacing the Cu atom monolayer with Pt to obtain the Pt-Au@Pt core-shell structure fuel cell cathode catalyst. The catalyst prepared by using the preparation method disclosed by the invention is high in catalytic activity and stability and low in cost relative to a pure Pt catalyst; and the preparation method is simple and convenient, mild in condition and easy to operate and can be used for solving the problem that a core-shell structure catalyst prepared by using a conventional chemical reduction method is high in Pt agglomeration degree on the surface and a catalyst prepared by using a single underpotential deposition method is low in Pt coverage degree on the surface.

Description

[0001] technical field [0002] The invention belongs to the field of fuel cell catalysts, and in particular relates to a Pt-AuPt core-shell structure fuel cell cathode catalyst and a preparation method thereof. Background technique [0003] The precious metal Pt has very limited reserves in nature, and the extensive use of noble metal Pt limits the commercial application of fuel cells due to the problem of catalyst resources. In addition, the use of pure Pt as a fuel cell cathode catalyst has the problems of low fuel cell cathode performance and poor stability. Although currently Pt with 3 d Alloys formed by transition metals Fe, Co, Ni, Cu, etc. can improve the performance of fuel cell cathodes to a certain extent, but these Pt-3 d The atomic fraction of Pt in the alloy must be greater than 50% in order to form a Pt-rich structure on the surface, thereby protecting the 3 d Metal, avoid due to 3 d Deterioration of catalyst stability due to metal dissolution. Because Au...

Claims

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Application Information

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IPC IPC(8): B01J23/52H01M4/92
CPCY02E60/50
Inventor 陈胜利戴煜
Owner WUHAN UNIV
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