title: Supported core@shell electrocatalysts for fuel cells: close encounter with reality.
abstract: Core@shell electrocatalysts for fuel cells have the advantages of a high utilization of Pt and the modification of its electronic structures toward enhancement of the activities. In this study, we suggest both a theoretical background for the design of highly active and stable core@shell/C and a novel facile synthetic strategy for their preparation. Using density functional theory calculations guided by the oxygen adsorption energy and vacancy formation energy, Pd₃Cu₁@Pt/C was selected as the most suitable candidate for the oxygen reduction reaction in terms of its activity and stability. These predictions were experimentally verified by the surfactant-free synthesis of Pd3Cu1/C cores and the selective Pt shell formation using a Hantzsch ester as a reducing agent. In a similar fashion, Pd@Pd₄Ir₆/C catalyst was also designed and synthesized for the hydrogen oxidation reaction. The developed catalysts exhibited high activity, high selectivity, and 4,000 h of long-term durability at the single-cell level.
authors: Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seoul 136-791, Korea.
authors: Seung Jun
authors: SJ
authors: Hwang
authors: Sung Jong
authors: SJ
authors: Yoo
authors: Jungho
authors: J
authors: Shin
authors: Yong-Hun
authors: YH
authors: Cho
authors: Jong Hyun
authors: JH
authors: Jang
authors: Eunae
authors: E
authors: Cho
authors: Yung-Eun
authors: YE
authors: Sung
authors: Suk Woo
authors: SW
authors: Nam
authors: Tae-Hoon
authors: TH
authors: Lim
authors: Seung-Cheol
authors: SC
authors: Lee
authors: Soo-Kil
authors: SK
authors: Kim