Carbon-supported platinum-based nanoparticles and preparation method thereof

Highly dispersed carbon-supported platinum-based nanoparticles were prepared using a "two-way dynamic confinement" method, which solved the problems of low activity and high cost of fuel cell cathode catalysts and enabled efficient and simple large-scale production.

CN121748423APending Publication Date: 2026-03-27SUZHOU HYDROYANG NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202511999581.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing cathode catalysts for fuel cells have low activity and poor stability, and precious metal materials are expensive. Traditional preparation methods are complex and difficult to achieve small-particle-size, highly dispersed platinum-based alloy catalysts.

Method used

By employing a "two-way dynamic confinement" method, the difference in solubility product between alkaline earth metal salts and platinum and transition metal salts is used to form carbonate or sulfide precipitates during the drying process of the mixed solution. Combined with high-temperature heat treatment, in-situ reduction and alloying of platinum-transition metal hydroxides are achieved, forming highly dispersed carbon-supported platinum-based nanoparticles.

Benefits of technology

The prepared carbon-supported platinum-based nanoparticles exhibit excellent electrochemical activity, with a specific activity 4-6 times that of traditional commercial platinum-carbon nanoparticles. The particle size is less than 3.5-4 nm, which reduces the cost of fuel cell materials, simplifies the preparation process, and facilitates large-scale production.

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Abstract

The invention discloses a carbon-supported platinum-based nanoparticle and a preparation method thereof, and belongs to the field of proton exchange membrane fuel cell cathode catalysts, the carbon-supported platinum-based nanoparticle comprises the following raw materials by weight: 0.4-2 parts of carbon powder, 0.1-2 parts of a complexing agent, 1 part of a platinum salt, 0.3-3 parts of a soluble transition metal salt, 0.1-0.5 part of a soluble alkaline earth metal salt, and 0.2-0.6 part of a precipitant, the soluble alkaline earth metal salt is at least one of beryllium chloride, magnesium chloride, calcium chloride, strontium chloride and barium chloride, the invention provides a'bidirectional dynamic range limiting 'method, on one hand, the problems that a traditional template method is complex in operation step, poor in range limiting effect and difficult to remove a subsequent template are solved; on the other hand, the current situation that nanoparticles synthesized by a traditional coprecipitation method are prone to agglomeration and uneven in particle size is improved, and a new thought is provided for preparation of platinum-based alloy.
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