A supported platinum-based core-shell catalyst and preparation method thereof

Abstract

The invention discloses a supported platinum-based core-shell catalyst and a preparation method thereof. The catalyst comprises a carbon-based carrier and an active component of a core-shell structure loaded thereon, and the carbon-based carrier is a carbon material or a mixture of carbon The active component is a platinum-cobalt bicomponent nanoparticle, specifically a platinum-cobalt nanoparticle with a core-shell structure with cobalt as the core and platinum as the shell. The catalyst prepared by this preparation method uses the reflux reaction in the alcohol-water mixed solution to pre-generate carbon-supported cobalt core particles under normal pressure, which can more easily control the formation and particle size of the core particles, and use hydrothermal reaction to realize metal particles in the catalyst. The surface of the carbon support is uniformly distributed; through the gas phase reduction at different temperatures, the distribution and enrichment of the platinum-cobalt atoms of the metal particles are adjusted, thereby improving the activity of the electrode catalyst; no surfactant is required, and the supported type can be realized through simple continuous operation Mass production of platinum-based core-shell catalysts.

Description

technical field [0001] The invention belongs to the technical field of fuel cells and catalysts, and in particular relates to a supported platinum-based core-shell catalyst and a preparation method thereof. Background technique [0002] A fuel cell refers to a device that directly converts the chemical energy in fuel into electrical energy through an electrochemical reaction. In order to achieve and ensure a fast electrochemical reaction rate, the fuel cell electrode material must have good catalytic activity. Platinum-based catalysts are considered to be the best electrode materials for low-temperature hydrogen-oxygen fuel cells because of their excellent catalytic activity and stability at low temperatures. On the other hand, precious metals such as platinum are expensive, and the earth's reserves are limited, which limits their large-scale application in fuel cells to a certain extent, and has become one of the key factors restricting the marketization of fuel cells. How...

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a supported platinum-based core-shell catalyst and its preparation method, which can be operated continuously and is suitable for batch production, so as to overcome the high platinum consumption and high cost of fuel cell electrode catalysts, etc. Disadvantages, as well as the defects that the existing thin-shell catalyst preparation technology is not easy to mass-produce, save the amount of platinum metal, reduce the cost of electrode catalysts, and help promote the development and application of fuel cells

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