Preparation method of PtVFe/WC/C nano-oxygen reduction catalyst

Abstract

The invention discloses a preparation method of a PtVFe / WC / C nano-composite oxygen reduction catalyst. A PtVFe solution was previously prepared in a laboratory. The preparation method comprises the following steps of first, adding 140mg of mixture of tungsten carbide and carbon powder in 200mL of hexane, performing supersonic treatment for 2 hours, and then adding prepared 60mg of PtVFe solution (platinum source, vanadium source, and iron source are platinum 2,4-pentanedionate, vanadium(III)-2,4-pentanedionate and iron pentacarbonyl) so as to prepare a PtVFe / WC / C mixed solution; second, performing supersonic treatment on the mixed solution for 1 hour, then stirring for 16 hours; third, stirring for 4-8 hours under protection of nitrogen (N2) so as to evaporate suspension slowly; fourth, collecting and drying an evaporated product under protection of N2 so as to obtain PtVFe / WC / C powder; fifth, performing thermal treatment on the PtVFe / WC / C powder for 60 minutes under protection of N2, wherein the temperature is 260 DEG C; and sixth, calcining the thermal treated PtVFe / WC / C powder for 120 minutes at 400 DEG C under protection of 15% of H2 and 85% of N2, so as to obtain the PtVFe / WC / C nano-composite oxygen reduction catalyst. The PtVFe / WC / C oxygen reduction catalyst prepared by the method has better electrochemical activity and stability, not only improves the cathode reaction efficiency, but also prolongs the cycle life of the cathode.

Description

technical field [0001] The invention relates to a preparation method of a PtVFe / WC / C nanocomposite catalyst, in particular to a preparation method of a PtVFe / WC / C composite catalyst in an oxygen reduction reaction. Background technique [0002] Fuel cells that use hydrogen as fuel, such as proton exchange membrane fuel cells, are the most efficient way to utilize hydrogen because of its high conversion efficiency, low pollution, light weight, and high power density. and industry has a wide range of applications. Catalysts are one of the most critical components of fuel cells, accounting for nearly 30% of the cost of manufacturing fuel cells. The stability of platinum-based catalysis is reduced by sintering and dissolution in fuel cells. The most critical challenges in realizing the eventual commercialization of fuel cells for oxygen reduction applications are activity, stability, and low consumption. At low temperatures (<100 °C), the most persistent problem with oxyge...

AI Technical Summary

Problems solved by technology

At low temperatures (<100°C), the most persistent problem with fuel cells in terms of oxygen reduction is catalyst cathode power limitation

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