A kind of preparation method of highly active platinum nanowire catalyst

Abstract

The invention provides a method for preparing a highly active platinum nanowire catalyst, specifically relating to the field of catalyst preparation. First, weigh 451.781 mg of chloroplatinic acid, 11.22 mg of potassium hydroxide, and weigh 10-15 mg of carbon black EC-600, and then Mix the substances in S1 and add 2‑5mL ultrapure water to dissolve, place in an ultrasonic machine for 1‑2h; then dry the mixed solution in S2 after ultrasonication for 1.5‑2h at a drying temperature of 80‑90°C. When the temperature drops to room temperature and the oven is turned on, a black solid mixture containing Pt can be obtained; finally, the black solid mixture obtained after drying is placed in a tube furnace, and nitrogen gas is passed for 0.5h first, and after the air in the tube is exhausted; then Introduce hydrogen for reduction, control the temperature at 150-300°C, and the time is 0.5-1h, and finally turn on the tube furnace to obtain the platinum nanowire catalyst. The platinum nanowire catalyst prepared by the invention can greatly improve the surface catalytic activity and improve the utilization efficiency of the platinum catalyst.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a preparation method of a highly active platinum nanowire catalyst. Background technique [0002] Due to the high price of precious metal platinum, the low utilization rate of platinum particles, the different sizes of catalyst particles, and the different degrees of dispersion on the carrier, the traditional commercial platinum nanowires lead to high catalyst costs, complex processes, and poor catalyst stability. A series of issues, all of which are important factors limiting widespread commercial use; [0003] During the operation of the fuel cell, the carbon-supported Pt nanoparticles migrate with the corrosion of the carbon support; in addition, due to the large specific surface area of ​​the Pt nanoparticles, Oswald ripening is easy to occur, which leads to the electrochemical ratio of the Pt nanoparticles. The surface area decreases, and the electrocatalytic...

AI Technical Summary

Problems solved by technology

[0002] Due to the high price of precious metal platinum, the low utilization rate of platinum particles, the different sizes of catalyst particles, and the different degrees of dispersion on the carrier, the traditional commercial platinum nanowires lead to high catalyst costs, complex processes, and poor catalyst stability. A series of issues, all of which are important factors limiting widespread commercial use;

[0003] During the operation of the fuel cell, the carbon-supported Pt nanoparticles migrate with the corrosion of the carbon support; in addition, due to the large specific surface area of ​​the Pt nanoparticles, Oswald ripening is easy to occur, which leads to the electrochemical ratio of the Pt nanoparticles. The surface area is reduced, and even the electrocatalytic activity declines; and at present, H2 used in fuel cells is mainly produced by reforming hydrocarbons, often containing CO impurities, which can lead to catalyst poisoning and greatly reduce catalytic activity

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