Device and method for preparing carbon-supported platinum nano-catalyst through solid phase mixing

Abstract

The invention discloses a device and method for preparing a carbon-supported platinum nano-catalyst through solid phase mixing. The device comprises a precursor solution tank, a solution mixing device, a mixed solution tank and a material tank which are sequentially connected through a pipeline and a pump, the solution mixing device is provided with a spiral pipeline, and the material tank is placed in the solid material mixing device. The application method comprises the following steps: fully mixing a precursor solution through a spiral pipeline and ultrasonic treatment, adding the carbon carrier into the precursor mixed solution under a stirring state or adding the precursor mixed solution into the carbon carrier for ultrasonic pretreatment, stirring and mixing, drying, reducing and sintering, cleaning, and drying again. Compared with the prior art, the method has the advantages that the operation process is simple and controllable, the period is short, an organic surfactant and a complexing agent do not need to be added, pure water filtration and cleaning are adopted, a large amount of pollution waste liquid cannot be generated, batch continuous production of the high-load PtC catalyst can be achieved, and the invention is suitable for large-scale preparation of the PtC catalyst for commercial application.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalyst materials, in particular to a device and method for preparing carbon-supported platinum nano-catalysts by solid phase mixing. Background technique [0002] Fuel cells use hydrogen as fuel and have outstanding advantages such as high energy density, long cruising range, clean and environmental protection, and are considered to be the most ideal new energy technology in the 21st century, showing broad application prospects in the fields of automobiles and energy storage. The main mechanism of the fuel cell is to convert the chemical energy of the reaction of hydrogen and oxygen into electrical energy through an electrochemical reaction. Conversion efficiency, so the catalyst is an indispensable key material. The current commercial fuel cell catalyst is a carbon-supported platinum (PtC)-based catalyst. Through simple and environmentally friendly processes and devices, large-scale preparati...

AI Technical Summary

Problems solved by technology

The liquid phase method needs to add reducing agent and surfactant for treatment, so that the Pt nanoparticles are reduced and adsorbed on the surface of the carbon carrier, and the agglomeration of the particles is avoided. The subsequent steps require a large amount of aqueous or organic solvents for filtration and cleaning, resulting in a large amount of Organic waste liquid, and the filtration efficiency is low, which is not conducive to large-scale production

The solid-phase method is mainly to mix the Pt-containing precursor solution with the carbon carrier, dry it and treat it in a reducing atmosphere to obtain PtC particles. Adjusting the precursor solution to acidity is a common technical means of the solid-phase method, although this method can obtain evenly dispersed particles. Pt particles, but because its principle is electrostatic adsorption, only PtC catalysts with low loading (Pt content <10%) can be prepared, which cannot meet the performance requirements of commercial fuel cell catalysts. In addition, complexing agents are added to the precursor solution , improving the dispersibility of Pt particles and reducing the particle size is also a common technical method for preparing PtC catalysts by solid-state method, but the introduction of complexing agents will cause the surface of Pt particles to be unclean and affect the catalytic performance of the catalyst. It also requires a large amount of water or Organic solvents are filtered and cleaned, and there is environmental pollution

[0004] In summary, in the existing methods for preparing PtC catalysts, it is usually necessary to add surfactants or complexing agents, which not only affects the cleanliness of the catalyst surface, is not conducive to the catalytic reaction, but also requires the use of a large amount of organic solvents for subsequent filtration and cleaning. , produce a large amount of polluted waste liquid, in addition, it is difficult to obtain a high-load PtC catalyst, which is not conducive to commercial development

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