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권경중,Kang Hee Lee,엄동호,Seon-ah Jin,Hyun S. Park,Jinwon Cho,현진호,함형철,박찬호 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
PdIr nanoparticles supported on carbon support are synthesized and their oxygen reduction reaction(ORR) activity and durability in a half cell or membrane-electrode assembly (MEA) configuration forpolymer electrolyte membrane fuel cell are examined. A synergistic effect of the combination of Pdpossessing the effective ORR catalytic activity and Ir as one of the most stable elements in acidic medialeads to a decrease in particle size, a higher particle dispersion, and a better ORR activity than Pdmonometallic catalysts. It is expected that PdIr alloys would form phase-separated nanoalloys that havePd-rich surface owing to the higher surface energy of Ir. The addition of Ir to Pd in PdIr/C increases themetallic Pd portion. Meanwhile, the Pd5Ir/C is the most durable compared to Pd/C and Pt/C over 3000 h ofMEA operation. The ORR activity of PdIr alloy is expected to increase by reducing the oxygen bindingenergy of Pd in the presence of Ir from thefirst-principle calculation, and each contribution ofcompressive strain and ligand effects is quantified. The cohesive energy and the kinetic segregationenergy are also calculated to support the improved stability of PdIr compared to Pd and Pt in the ORRcondition.