Kwon, Kyungjung Lee, Kang Hee Um, Dong Ho Jin, Seon-ah Park, Hyun S. Cho, Jinwon Hyun, Jinho Ham, Hyung Chul Pak, Chanho 2024-01-19T14:34:23Z 2024-01-19T14:34:23Z 2021-10-21 2021-05 1226-086X https://pubs.kist.re.kr/handle/201004/117034 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 for polymer electrolyte membrane fuel cell are examined. A synergistic effect of the combination of Pd possessing the effective ORR catalytic activity and Ir as one of the most stable elements in acidic media leads to a decrease in particle size, a higher particle dispersion, and a better ORR activity than Pd monometallic catalysts. It is expected that PdIr alloys would form phase-separated nanoalloys that have Pd-rich surface owing to the higher surface energy of Ir. The addition of Ir to Pd in PdIr/C increases the metallic Pd portion. Meanwhile, the Pd5Ir/C is the most durable compared to Pd/C and Pt/C over 3000 h of MEA operation. The ORR activity of PdIr alloy is expected to increase by reducing the oxygen binding energy of Pd in the presence of Ir from the first-principle calculation, and each contribution of compressive strain and ligand effects is quantified. The cohesive energy and the kinetic segregation energy are also calculated to support the improved stability of PdIr compared to Pd and Pt in the ORR condition. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. English 한국공업화학회 Elucidation of durability of carbon-supported PdIr alloy catalyst by experimental and theoretical approaches in polymer electrolyte membrane fuel cell Article 10.1016/j.jiec.2021.02.013 1 Journal of Industrial and Engineering Chemistry, v.97, pp.280 - 286 Journal of Industrial and Engineering Chemistry 97 280 286 N scie scopus kci ART002734429 000640614600014 2-s2.0-85101607913 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article OXYGEN REDUCTION REACTION ELECTROCATALYTIC ACTIVITY IRIDIUM IR NANOPARTICLES ENHANCEMENT NANOALLOY MECHANISM PdIr alloy catalyst Oxygen reduction reaction Membrane electrode assembly durability Density functional theory Polymer electrolyte membrane fuel cell