A platinum-based alloy catalyst, a preparation method and application thereof

A core-shell structured PtM1M2@Pt particle catalyst with ordered structure was synthesized by freeze-drying gelation method, which solved the problem of easy dissolution of non-precious metals, improved the ORR activity and stability of the catalyst, and is suitable for fuel cells.

CN116130689BActive Publication Date: 2026-07-24GEM CO LTD
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Patent Information

Application Number
CN202310248399.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-15
Publication Date
2026-07-24
Estimated Expiration
2043-03-15

AI Technical Summary

Technical Problem

Existing platinum-based alloy catalysts are prone to non-precious metal dissolution in acidic oxygen reduction reaction environments, leading to a decrease in catalytic activity and stability, which limits their application in fuel cells.

Method used

A multi-metallic compound catalyst with ordered structure was synthesized by freeze-drying gelation method. Core-shell structured PtM1M2@Pt particles were formed by mixing platinum salt, M metal salt, organic matter and carbon support. Annealing and acid washing treatments were then used to improve the dispersibility and crystallinity of the catalyst.

Benefits of technology

Effective control of catalyst particle size improves the catalyst's ORR activity and stability, prevents the dissolution of non-precious metals, and enhances the electrochemical performance of fuel cells.

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Abstract

The application provides a platinum-based alloy catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a platinum salt, an M metal salt, an organic matter, a carbon carrier and a solvent to obtain a hydrogel; wherein the M comprises a metal other than Pt; the hydrogel is subjected to freeze-drying to obtain an aerogel; the aerogel is subjected to annealing and post-processing to obtain the platinum-based alloy catalyst; the platinum-based alloy catalyst obtained by the preparation method is a binary or more alloy catalyst, has an ordered structure, can solve the problem that a non-noble metal of a conventional alloy catalyst is prone to being dissolved, meanwhile, the preparation method can effectively control the particle size of the catalyst and can make the atoms in the metal alloy be arranged in an order, therefore, the obtained catalyst has excellent electrochemical performance and high stability.
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