Polyaniline-Tungsten Carbide Composite Catalyst

Fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is electrode catalyst. For a long time, precious metals such as platinum and ruthenium have been widely used because of their excellent catalytic performance. Alloy catalyst can reduce the Pt loading and improve the catalytic efficiency, but the stability of catalyst needs to be improved.

Recently, a Polyaniline-Tungsten carbide composite catalyst for fuel cell cathode has been proposed. The catalyst has the characteristics of low cost, good stability and high catalytic activity. The preparation process includes the following steps:

A.Adding aniline in hydrochloric acid solution, stirring continuously; dissolving ammonium persulfate in hydrochloric acid solution, then adding the obtained ammonium persulfate solution to the mixture of hydrochloric acid and aniline solution, stirring continuously; then adding sodium hypochlorite solution, adding sodium hypochlorite solution, stopping stirring and reacting; after the reaction, the reactant is filtered and washed, first dissolved with hydrochloric acid. Liquid washing, then washing with ultra-pure water, and finally washing with acetone. Finally, after drying and grinding, dark green polyaniline powder was obtained.

B.Disperse the polyaniline powder uniformly in ultra-pure water, add tungsten carbide powder, stir continuously, and carry out compound reaction. After the reaction is completed, the reactant is filtered and washed, and the reactant is washed to neutral with ultra-pure water. After drying, grinding, the powder is obtained.

C.Put the powder obtained in step B into the ceramic boat. Put the ceramic boat into the closed tubular furnace and blow it with nitrogen. Then start the program to raise the temperature to 900-1100 ℃ and keep it at 0.5-2 H. Then it is cooled to room temperature under the protection of nitrogen and grinded to obtain the target catalyst, i.e. Polyaniline-Tungsten carbide composite catalyst.

Tungsten carbide is used to replace the complex of precious metals and polyaniline. Tungsten carbide particles treated by simple surface treatment can be well dispersed in dispersing media, which makes the final product have high conductivity, good stability, good electrochemical performance and catalytic activity, and low cost.

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