Carbon-loaded kernel-shell copper-palladium-platinum catalyst for fuel battery and preparation method thereof

Abstract

The invention provides a carbon-loaded kernel-shell copper-palladium-platinum catalyst for a fuel battery and a preparation method thereof. Conductive carbon black is used as a carrier, an active component is a copper-palladium-platinum alloy with a nuclear-shell structure, wherein the copper palladium is a kernel, the platinum is a shell, and the catalyst comprises the following ingredients by mass percent: 70 to 91 percent of conductive carbon black, 2 to 10 percent of copper, 2 to 10 percent of palladium and 5 to 10 percent of platinum. A two-step reduction method is utilized, namely, low-activity metal is firstly reduced, then the active precious metal is reduced, the precious metal is precipitated on the surface of the non-precious metal by controlling the reaction temperature and the pH value, and a kernel-shell catalyst is formed through a dealloying step; and in addition, the carbon carrier is added in the preparation process, so that the nano metal particles can directly grow on the carrier, the combination of the catalyst particles and the carbon carrier can be enhanced, and the catalyst is more stable. Due to the adoption of the preparation method, the catalyzing efficiency of the catalyst and the utilization rate of the precious metal can be greatly improved, and the development of the fuel battery can be promoted.

Description

technical field [0001] The invention relates to a carbon-loaded core-shell type copper-palladium-platinum alloy catalyst (CuPdPt / C) for fuel cells and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is an electrode catalyst. For a long time, noble metals such as platinum and ruthenium have been widely used because of their excellent catalytic performance. However, due to the limited content of platinum group metals in the earth's crust, the price is high, and the rate of platinum in batteries is not high, which limits the development of fuel cells. Although the alloy catalyst can reduce the loading of Pt and improve the catalytic efficiency, the stability of the catalyst needs to be improved. Due to their unique catalytic properties, core-shell catalysts have attracted more and more attention in recent years, and thus have been widely ...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the operation process is simple and the preparation cost is low, but the particle size of the catalyst is too large, and the catalyst is only connected to the carbon support by adsorption, and it is easy to fall off during the electrochemical reaction, thereby reducing the catalytic efficiency.

Images