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

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...

AI Technical Summary

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. The preparation process of these methods is cumbersome, and it is not easy to achieve a single layer of shell metal coverage, so it is difficult to achieve the highest noble metal Utilization

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