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

A fuel cell cathode and core-shell structure technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low catalytic activity, low Pt coverage on the catalyst surface, low coverage, etc., to achieve Effects of area activity improvement, excellent catalytic activity, and mass activity improvement

Inactive Publication Date: 2015-04-15
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 the coverage of Cu underpotential deposition on the Au surface is quite low (less than 0.5) , the final catalyst surface has low Pt coverage, a large amount of Au is exposed, and the overall catalytic activity is low

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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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preparation example Construction

[0030] The preparation method comprises steps: 1) adding sodium borohydride to the mixed solution of the gold compound and sodium citrate to reduce the gold compound to obtain Au nanoparticles. After that, the Au particles are supported on the surface of the carbon carrier to obtain carbon-supported Au, which is denoted as Au / C.

[0031] 2) Put Au / C in an aqueous solution of a platinum compound without adding a reducing agent, let Pt spontaneously reduce on the surface of Au, centrifuge and dry to obtain supported Pt-Au alloy nanoparticles, wherein the reduction temperature is 20~100 ℃, the concentration of platinum compound is 10 -5 mol / L ~10 -2 mol / L.

[0032] 3) The Pt-Au alloy nanoparticles obtained by spontaneous reduction are coated on the electrode surface, and the Cu atomic layer is obtained by the method of underpotential deposition, and the Cu prepared by this method is called UPD Cu. Soaking the electrode in the replacement solution allows the Pt to replace the...

Embodiment 1

[0034] 1) Pt-AuPt / C core-shell structure catalyst Pt 0.2 AuPt 0.15 Preparation of / C

[0035] In the mixed solution of chloroauric acid and sodium citrate, add sodium borohydride to reduce chloroauric acid, stir evenly, add a conductive carrier after the solution turns purple, immerse at room temperature for 36 hours, centrifuge and vacuum dry to obtain carbon-loaded Au, namely Au / C;. Put Au / C at a concentration of 10 -4 mol / L ~10 -3 In the aqueous solution of the potassium chloroplatinite of mol / L, stir 24 hours at 25 degrees, 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 underpotential deposition potential of Cu to obtain an electrode with a Cu atomic layer. Soak the electrode with UPD Cu monolayer in the replacement solution potassium chloroplatinite solution for 30 min, so that Pt can replace the Cu atoms on the surface of the e...

Embodiment 2

[0041] 1) Pt-AuPt / C core-shell structure catalyst Pt 0.1 AuPt 0.17 Preparation of / C

[0042] In the mixed solution of chloroauric acid and sodium citrate, add sodium borohydride to reduce chloroauric acid, stir evenly, add a conductive carrier after the solution turns purple, immerse at room temperature for 48 hours, centrifuge and vacuum dry to obtain carbon-loaded Au, that is, Au / C; put Au / C at a concentration of 10 -5 mol / L ~10 -4 In the aqueous solution of potassium chloroplatinite of mol / L, stir 12 hours at 30 degree, 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 underpotential deposition potential of Cu to obtain an electrode with a Cu atomic layer. Soak the electrode with UPD Cu monolayer in the replacement solution potassium chloroplatinite solution for 15 min, so that Pt can replace the Cu atoms on the surface of the electr...

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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

technical field [0001] 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 [0002] 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 has high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52H01M4/92
CPCY02E60/50
Inventor 陈胜利戴煜
Owner WUHAN UNIV
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