Method for preparing nano-dendritic platinum catalyst

Abstract

The invention relates to a method for preparing a nano-dendritic platinum catalyst. The method comprises the steps: mixing H2PtCl6.6H2O with PVP (Polyvinylpyrrolidone), and adding isopropanol after uniformly mixing; irradiating under the irradiating dosage of 140KGy, transferring an obtained product into a centrifuge tube, and then, carrying out high-speed centrifugation so as to obtain a precipitate; discarding supernatant, repeatedly washing the precipitate by using ethanol and water, and carrying out centrifugation repeatedly until no suspended matters appear in an upper layer; drying the precipitate for a period of time in a vacuum drying oven at certain temperature, thereby finally obtaining the nano-dendritic platinum catalyst. According to the nano-dendritic platinum catalyst obtained by the method, the effective electrochemical surface area is 39.5m<2> / g, the If / Ib is 1.57, the electrocatalysis activity and poisoning resistance are high, the problems during the anodic electrooxidation of methanol that the rate is slow, the phenomenon of polarization is serious, the catalysis efficiency is low, and the like can be solved, and the nano-dendritic platinum catalyst can directly serve as an anode catalyst of a methanol fuel cell.

Description

technical field [0001] The invention relates to a preparation method of a platinum catalyst, in particular to a preparation method of a dendritic nanostructure platinum catalyst. Background technique [0002] In the last two decades, the application of nano-noble metals in various fields has been extensively studied. This is because nano-noble metals not only have bulk properties such as chemical stability, electrical conductivity, and high catalytic performance, but also have unique optical, Electrical, catalytic, magnetic properties. Among them, nanoporous metals have unique physical, chemical and mechanical properties due to their unique structures such as nanoscale pore size, bicontinuous internal structure, and high specific surface area, and have an irreplaceable position in the field of materials science. . Platinum and its alloys are widely used as catalysts in chemical reactions; for example, due to their excellent performance in absorbing and dissociating hyd...

AI Technical Summary

Problems solved by technology

However, among the many reactions to synthesize platinum dendritic nanostructures, the required reaction process is complex (multi-step reaction, seed crystal growth, high reaction temperature, long reaction time), which limits the application of platinum dendritic nanostructures.

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