Kim, Youngjin Jang, Jue-Hyuk Min, Jiho Jeffery, A. Anto Lee, Seunghyun Chougule, S. S. Kim, MinJoong Jung, Namgee Yoo, Sung Jong 2024-01-19T13:30:51Z 2024-01-19T13:30:51Z 2022-01-10 2021-11-09 2050-7488 https://pubs.kist.re.kr/handle/201004/116140 The development of Pt-based alloy nanoparticles has contributed to improving fuel cell performance. Nevertheless, the commercialization of the catalysts is limited due to structural stability issues. To enhance the durability of Pt-based alloy catalysts, carbon-encapsulated nanoparticles have been widely studied. However, fine-tuning the carbon shell structure at the atomic scale remains a challenge when adopting a typical top-down approach, which involves a high-temperature graphitization process after polymer coating. Here, we propose a bottom-up approach to carbon encapsulation of Pt3Fe1 nanoparticles. Using extremely small amounts of carbon sources produced by the decomposition of organic ligands in metal precursors, carbon-encapsulated Pt3Fe1 nanoparticles with ultrathin carbon shells are fabricated without additional polymer coating process. Furthermore, the pore structure of the carbon shells is rationally modulated at the sub-nm level without changing the particle size via carbon etching using H-2 gas. In-depth studies prove that the fine-tuned carbon shell structure has a significant effect on the activity and durability of Pt3Fe1 nanoparticles. Using the testing protocol suggested by the US Department of Energy, a target-customized carbon shell structure has been discovered that satisfies the 2025 targets of "<30 mV loss at 0.8 A cm(-2)" and "<40% loss of electrochemical active surface area". English ROYAL SOC CHEMISTRY MEMBRANE-ELECTRODE ASSEMBLIES STABLE ELECTROCATALYSTS HYDROGEN OXIDATION OXYGEN DURABILITY PLATINUM CATALYST DESIGN GRAPHENE AU A target-customized carbon shell structure of carbon-encapsulated metal nanoparticles for fuel cell applications Article 10.1039/d1ta06289a 1 JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.43, pp.24480 - 24487 JOURNAL OF MATERIALS CHEMISTRY A 9 43 24480 24487 scie scopus 000711953500001 2-s2.0-85118923601 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article MEMBRANE-ELECTRODE ASSEMBLIES STABLE ELECTROCATALYSTS HYDROGEN OXIDATION OXYGEN DURABILITY PLATINUM CATALYST DESIGN GRAPHENE AU