Method for preparing stepped Pt-Au core-shell structural catalyst

A core-shell structure and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, structural parts, etc., can solve problems such as difficult shell metal single-layer coverage, high utilization rate of precious metals, cumbersome preparation process, etc., to achieve The effect of reducing the generation of toxic intermediate products, improving electrochemical activity and stability, and high utilization

Inactive Publication Date: 2015-09-16
HARBIN INST OF TECH
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Problems solved by technology

At present, the preparation of core-shell structure catalysts is mainly through chemical methods, such as colloidal method, thermal decomposition method, chemical replacement method, etc. Th

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  • Method for preparing stepped Pt-Au core-shell structural catalyst
  • Method for preparing stepped Pt-Au core-shell structural catalyst
  • Method for preparing stepped Pt-Au core-shell structural catalyst

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[0043] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0044] The invention provides a method for preparing a stepped Pt-Au core-shell structure anode catalyst for a direct formic acid fuel cell, and the specific implementation steps are as follows:

[0045] 1. Preparation of Au / C catalyst:

[0046] The preparation of Au / C is by impregnation reduction method, and the specific steps are as follows:

[0047] (1) Preliminary preparation: ultrasonically disperse 40mg of XC-72R carbon black in ultrapure water for 30min; weigh 19.22mg of sodium borohydride and dissolve it in 0.508mL, 0.1mol / L sodium citrate ice ...

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Abstract

The present invention discloses a method for preparing a stepped Pt-Au core-shell structural catalyst, and the stepped single atomic shell Pt-Au core-shell structural catalyst can be prepared by two-step underpotential deposition and two-step nonuniformity chemical in-situ displacement. Compared with a Pt-Au alloy structure catalyst, the Pt utilization rate can be effectively improved by single Pt; compared with a conventional single-layer core-shell structure Pt catalyst, by the stepped surface structure, each Pt atom is adjacent to Au atoms, Au can play electronic effects; and Pt sites are blocked by the Au atoms, Au can also play the overall effect; compared with a conventional sub-monolayer shell structure Pt catalyst, the complete Pt layer surface structure can improve the stability of the catalyst. The method not only can achieve a high Pt shell atom utilization rate, and reduces toxic intermediate products, and the catalytic reaction is performed towards the most favorable path.

Description

technical field [0001] The invention relates to a preparation method of a Pt-Au binary catalyst with high Pt utilization rate for a novel catalytic battery. Background technique [0002] Catalyst is the most critical factor restricting the performance of catalytic batteries. Among many types of catalysts, the catalytic activity of noble metal catalysts is the most prominent. In order to break through the cost limitation, people have been working on the research of catalysts with low noble metal loading and high catalytic efficiency. Core-shell catalysts with noble metals as the shell and cheaper metals as the core have attracted extensive attention due to their high efficiency in the utilization of noble metals and the electronic effects between heterometallic metals. At present, the preparation of core-shell structure catalysts is mainly through chemical methods, such as colloidal method, thermal decomposition method, chemical replacement method, etc. The preparation proc...

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Application Information

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IPC IPC(8): B01J23/52H01M4/92H01M4/88
CPCY02E60/50
Inventor 张生许慧鑫尹鸽平周亚威杜磊
Owner HARBIN INST OF TECH
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