Abstract:

The carbonsupported Pt-P(Pt-P/C) catalyst(m(Pt)∶m(P)=5∶1) was prepared with NaH2PO2 reduction method. The X-ray diffraction results indicate that the 2θ values of the Pt diffraction peaks of the Pt-P/C catalyst are slightly greater than those of the Pt/C catalyst, illustrating that P has entered into the crystal lattice of Pt and forms the Pt-P alloy. The electrochemical measurements demonstrated that the electrocatalytic performance of the Pt-P/C catalyst for the oxygen reduction is better than that of the commercial E-TEK Pt/C catalyst with 40 mV positive shift of reduction potential, which may be attributed to the P action because the average size and the relative crystallinity of the Pt-P particles in the Pt-P/C catalyst are similar to those in Pt/C catalyst.

Key words: Proton exchange membrane fuel cell, Carbon-supported Pt-P catalyst, Carbon-supported Pt catalyst, Oxygen reduction