Lee, Sang -Young Jung, Namgee Shin, Dong Yun Park, Hee-Young Ahn, Docheon Kim, Hyoung-Juhn Jang, Jong Hyun Lim, Dong-Hee Yoo, Sung Jong 2024-01-20T01:30:23Z 2024-01-20T01:30:23Z 2021-09-05 2017-06-05 0926-3373 https://pubs.kist.re.kr/handle/201004/122643 Pt shells were synthesized on Pd-based alloy-cores via the chemical reduction method. Pt shells containing 1, 2, or 3 layers were prepared by controlling the amounts of Pt precursor used during synthesis. The thicknesses of Pt shell layers were calculated using the difference in the particle size between core and core-shell nanocatalysts, as determined from Cs-corrected scanning transmission electron microscopy (Cs-STEM) data. The shape and elemental distribution in the core-shell structured nanoparticles were analyzed using line profiles and elemental mapping from Cs-STEM. High-resolution X-ray diffraction and X-ray photoelectron spectroscopy analyses suggested that the structural and electronic properties of core-shell nanocatalysts were dependent on the number of shell layers. The activity and durability of the core-shell nanocatalysts were analyzed by the electrochemical method. Accelerated durability tests (ADT) were conducted in the potential range of 0.6-1V for 10000 cycles, and the mass and specific activities of ADT were shown to be stable for the carbon-supported core-shell nanocatalyst with two Pt shell layers (core@Pt[2](*)/C). In addition, excellent electrochemical performance was observed for the core@Pt[2]/C sample before and after the ADT compared to the commercial samples as well as other samples prepared in this study. Importantly, the optimized Pt usage demonstrated in this study would significantly contribute to the commercialization of proton exchange membrane fuel cells. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER PLATINUM-MONOLAYER ELECTROCATALYSTS INITIO MOLECULAR-DYNAMICS TOTAL-ENERGY CALCULATIONS NANOPARTICLE ELECTROCATALYSTS BIMETALLIC SURFACES CATALYTIC-ACTIVITY FACILE SYNTHESIS O-2 REDUCTION PT3CO ALLOY TRANSITION Self-healing Pd3Au@Pt/C core-shell electrocatalysts with substantially enhanced activity and durability towards oxygen reduction Article 10.1016/j.apcatb.2017.01.073 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.206, pp.666 - 674 APPLIED CATALYSIS B-ENVIRONMENTAL 206 666 674 scie scopus 000395602000066 2-s2.0-85011573193 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article PLATINUM-MONOLAYER ELECTROCATALYSTS INITIO MOLECULAR-DYNAMICS TOTAL-ENERGY CALCULATIONS NANOPARTICLE ELECTROCATALYSTS BIMETALLIC SURFACES CATALYTIC-ACTIVITY FACILE SYNTHESIS O-2 REDUCTION PT3CO ALLOY TRANSITION Self-healing Core-shell Electrocatalysts Durability Accelerate durability test Oxygen reduction