A catalyst with open hollow sphere structure and its preparation method and application

Abstract

The invention discloses a preparation method of a Pt open hollow sphere structure catalyst. The method is characterized in that the Pt open hollow sphere structure catalyst is prepared through a one-step chemical reduction method; and the method specifically comprises the steps of adding 4.0mg of Pt (acac)2, 10-80mg of lauryl sodium sulfate (SDS) and polyvinylpyrrolidone (PVP) to a container containing 8mL of a choline chloride / ethylene glycol eutectic solvent (DES) separately; carrying out ultrasonic treatment at room temperature for 10min, magnetically stirring for 5min and then carrying outmixing reaction on the obtained suspension at 110-160 DEG C for 0.5-5h; and centrifuging and washing a reaction product to obtain the Pt open hollow sphere structure catalyst. The method has the advantages of being simple in operation process, few in steps and mild and controllable in conditions, can be successfully synthesized in one step and has a good application prospect; the Pt open hollow sphere structure catalyst prepared through the method has the characteristics of being large in aperture and high in electrochemically active surface area; and the utilization efficiency of a noble metal Pt and the electrocatalytic activity and stability of the noble metal Pt on methanol oxidation can be improved.

Description

technical field [0001] The invention relates to the fields of electrocatalysis and fuel cells, in particular to a Pt open hollow sphere structure catalyst, a preparation method thereof, and an application in direct methanol fuel cells. Background technique [0002] At present, the anode process catalysts of direct methanol fuel cells (DMFCs) are still dominated by Pt-based materials, but Pt resources are scarce, the cost of catalysts is high, and the catalytic process is accompanied by the aggregation of nanoparticles, resulting in a sharp decline in catalytic activity. In addition, most Pt-based catalysts have a solid structure, which is not conducive to the full utilization of the noble metal Pt to a certain extent. Constructing new catalysts with robust structure and high utilization of noble metal Pt is one of the effective ways to solve these problems. In recent years, the shape-controlled synthesis of Pt-based nanocatalysts has attracted much attention. Among the man...

AI Technical Summary

Problems solved by technology

Although both the template method and the electrochemical displacement method can effectively prepare hollow nanostructures with controllable size, both methods have disadvantages such as many operation steps, complex synthesis process of required templates or nano-seeds, and internal processing The hollow structure of the template and the product is easily damaged during the collection process, resulting in the collapse of the structure

Therefore, it is still a great challenge to explore simple and effective preparation methods of Pt-based hollow structure catalysts.

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