Chung, Dong Young Jun, Samuel Woojoo Yoon, Gabin Kwon, Soon Gu Shin, Dong Yun Seo, Pilseon Yoo, Ji Mun Shin, Heejong Chung, Young-Hoon Kim, Hyunjoong Mun, Bongjin Simon Lee, Kug-Seung Lee, Nam-Suk Yoo, Sung Jong Lim, Dong-Hee Kang, Kisuk Sung, Yung-Eun Hyeon, Taeghwan 2024-01-20T05:31:00Z 2024-01-20T05:31:00Z 2021-09-03 2015-12-16 0002-7863 https://pubs.kist.re.kr/handle/201004/124620 Demand on the practical synthetic approach to the high performance electrocatalyst is rapidly increasing for fuel cell commercialization. Here we present a synthesis of highly durable and active intermetallic ordered face-centered tetragonal (fct)-PtFe nanoparticles (NPs) coated with a "dual purpose" N-doped carbon shell. Ordered fct-PtFe NPs with the size of only a few nanometers are obtained by thermal annealing of polydopamine-coated PtFe NPs, and the N-doped carbon shell that is in situ formed from dopamine coating could effectively prevent the coalescence of NPs. This carbon shell also protects the NPs from detachment and agglomeration as well as dissolution throughout the harsh fuel cell operating conditions. By controlling the thickness of the shell below 1 nm, we achieved excellent protection of the NPs as well as high catalytic activity, as the thin carbon shell is highly permeable for the reactant molecules. Our ordered fct-PtFe/C nanocatalyst coated with an N-doped carbon shell shows 11.4 times-higher mass activity and 10.5 times-higher specific activity than commercial Pt/C catalyst. Moreover, we accomplished the long-term stability in membrane electrode assembly (MEA) for 100 h without significant activity loss. From in situ XANES, EDS, and first-principles calculations, we confirmed that an ordered fct-PtFe structure is critical for the long-term stability of our nanocatalyst. This strategy utilizing an N-doped carbon shell for obtaining a small ordered-fct PtFe nanocatalyst as well as protecting the catalyst during fuel cell cycling is expected to open a new simple and effective route for the commercialization of fuel cells. English AMER CHEMICAL SOC STABLE ELECTROCATALYSTS FEPT NANOPARTICLES SHAPE-CONTROL PLATINUM ALLOY CATALYSIS DESIGN NANOCRYSTALS STABILITY STRATEGY Highly Durable and Active PtFe Nanocatalyst for Electrochemical Oxygen Reduction Reaction Article 10.1021/jacs.5b09653 1 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.137, no.49, pp.15478 - 15485 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 137 49 15478 15485 scie scopus 000366874700030 2-s2.0-84950318023 Chemistry, Multidisciplinary Chemistry Article STABLE ELECTROCATALYSTS FEPT NANOPARTICLES SHAPE-CONTROL PLATINUM ALLOY CATALYSIS DESIGN NANOCRYSTALS STABILITY STRATEGY