High-temperature preparation method of proton exchange membrane fuel cell binary alloy catalyst

Abstract

The invention belongs to the technical field of new energy materials and application, and particularly relates to a high-temperature preparation method of a proton exchange membrane fuel cell binary alloy catalyst. The preparation method comprises the following steps: (1) mixing and stirring a transition metal precursor solution and a platinum-carbon catalyst suspension to fully disperse; (2) adding a precipitant solution and a reducing agent solution into a mixed solution dispersed in step (1), adjusting the pH value of the mixed solution to 9-13, centrifuging or filter-pressing and washing for multiple times after complete precipitation, and fully drying to obtain catalyst precursor powder; and (3) roasting the catalyst precursor powder at high temperature, cooling, pickling, and dryingto obtain catalyst powder. The transition metal element and the platinum catalyst are used for forming the binary alloy catalyst, the cost of the catalyst can be reduced, after the transition metal and platinum form an alloy, crystal lattices of platinum shrink, and the adsorption energy of the surface to oxygen is reduced, so the catalytic activity of the oxygen reduction reaction is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and applications, and in particular relates to a high-temperature preparation method of a binary alloy catalyst for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells have the advantages of cleanliness, high efficiency, and high power density. They are research hotspots in recent years and have broad application prospects. However, their cost and life are still the main problems restricting their industrialization. Among them, the stability and price of the catalyst directly determine the durability and cost of the fuel cell. Therefore, it is necessary to develop fuel cell catalysts with high activity, low cost and high stability. [0003] At present, the catalysts used in fuel cells are mainly platinum catalysts. Platinum is expensive and resources are limited. The cost of pure platinum catalysts is relatively high, accounting for...

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Problems solved by technology

[0003] At present, the catalysts used in fuel cells are mainly platinum catalysts. Platinum is expensive and resources are limited. The cost of pure platinum catalysts is relatively high, accounting for about 40% of the cost of fuel cells. The catalytic activity of the catalyst for the oxygen reduction reaction on the cathode side is limited

In the existing reports on the preparation of alloy catalysts by high-temperature heat treatment, high-temperature treatment will make the alloy particles grow, and the particle size will greatly affect the catalytic activity of the catalyst particles.

At the same time, during the operation of the battery, the catalyst particles will agglomerate and dissolve, which will reduce the performance of the battery, reduce its stability and shorten its life.

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