Patrick, Brian Ham, Hyung Chul Shao-Horn, Yang Allard, Lawrence F. Hwang, Gyeong S. Ferreira, Paulo J. 2024-01-20T13:01:29Z 2024-01-20T13:01:29Z 2021-08-31 2013-02-26 0897-4756 https://pubs.kist.re.kr/handle/201004/128345 Pt3Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt3Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed. English AMER CHEMICAL SOC OXYGEN REDUCTION REACTION PT-CO SURFACE-COMPOSITION ALLOYS ELECTROCATALYSIS NANOPARTICLES ENHANCEMENT STABILITY KINETICS ORIGIN Atomic Structure and Composition of "Pt3Co" Nanocatalysts in Fuel Cells: An Aberration-Corrected STEM HAADF Study Article 10.1021/cm3029164 1 CHEMISTRY OF MATERIALS, v.25, no.4, pp.530 - 535 CHEMISTRY OF MATERIALS 25 4 530 535 scie scopus 000315618500003 2-s2.0-84874429804 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article OXYGEN REDUCTION REACTION PT-CO SURFACE-COMPOSITION ALLOYS ELECTROCATALYSIS NANOPARTICLES ENHANCEMENT STABILITY KINETICS ORIGIN PEM fuel cells platinum-alloyed catalysts aberration-corrected STEM nanoparticles