Preparation method of high-activity platinum nanowire catalyst

Abstract

The invention provides a preparation method of a high-activity platinum nanowire catalyst, and particularly relates to the field of catalyst preparation, which comprises the following steps: S1, weighing 45-55mg of 0.1-5 wt% chloroplatinic acid aqueous solution and 5-20mg of inorganic base, and weighing 10-15mg of one of Cabot carbon black XC-72, lion king carbon black EC600 and CHEZACARB carbon black AC30; S2, mixing the materials in S1, addding 2-5ml of hyperpure water for dissolution, and carrying out ultrasonic treatment in an ultrasonic machine for 1-2 hours; S3, the mixed solution subjected to ultrasonic treatment in S2 being dried for 1.5-2 h at the drying temperature of 80-90 DEG C, the temperature being reduced to the room temperature, a drying oven being opened, thus to obtain ablack solid mixture containing the Pt component; S4, putting the dried black solid mixture into a tubular furnace, introducing nitrogen for 0.5 h, discharging air in the tube completely, introducing hydrogen for reduction, controlling the temperature to be within 150-300 DEG C and the time to be 0.5-1 h, and finally opening the tubular furnace to obtain the platinum nanowire catalyst. The platinumnanowire 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 easily occurs, which leads to the electrochemical ratio of the Pt nanoparticles. The surface area decreases, and the electrocatalytic ac...

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 easily occurs, which leads to the electrochemical ratio of the Pt nanoparticles. The surface area decreases, and 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

Images