Synthesis and Properties of Palladium Phosphide/N,P-doped carbon composites for Oxygen Reduction

• 1、The School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331

Abstract：It is urgent to find a non-pt catalyst that can efficiently improve the sluggish oxygen reduction (ORR) kinetics on the fuel cell cathode.?In this study, Pd3P@NPC composite has been synthesized by themixingand calcination methods, and and its physical and chemical properties have been proved by means of SEM, TEM, XRD, XPS and other characterization instruments.Pd3P@NPC catalyst has been applied to the ORR performance tests, whichindicatePd3P@NPC possessescomparable catalytic activity with commercial Pt/C. The half-wave potential（0.842 V）of Pd3P@NPCis only 9 mV lower than Pt/C, and the mass activity of of Pd3P@NPCis3.05 times than that of Pt/C.?Palladium phosphide particles and N, P doped carbon in Pd3P@NPCcatalyze ORR synergistically, and their excellent electrical conductivity and electron interaction greatly enhance ORR catalytic activity.In addition, Pd3P @ NPC has remarkable stability due to the support of carbon substrate for the palladium phosphide particles, which makes it difficult to fall off during the catalytic process.?The results of this study have important enlightening value for exploiting Pd-based ORR catalysts.

Keywords： Electrocatalysis oxygen reduction reaction palladium phosphide nanoparticles heteroatoms doped carbon electronic interaction synergic catalysis