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Surface engineering of Pd-based nanoparticles by gas treatment for oxygen reduction reaction

Authors
  • Jeffery, A. Anto1
  • Lee, Sang-Young2
  • Min, Jiho1
  • Kim, Youngjin1
  • Lee, Seunghyun1
  • Lee, Jin Hee3
  • Jung, Namgee1
  • Yoo, Sung Jong4, 5, 6
  • 1 Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea , Daejeon (South Korea)
  • 2 The Environment Technology Institute, 1 Guanak-ro, Gwanak-gu, Seoul, 08826, Korea , Seoul (South Korea)
  • 3 Korea Research Institute of Chemical Technology, Daejeon, 34114, Korea , Daejeon (South Korea)
  • 4 Korea Institute of Science and Technology (KIST), Seoul, 02792, Korea , Seoul (South Korea)
  • 5 University of Science and Technology (UST), Seoul, 02792, Korea , Seoul (South Korea)
  • 6 Kyung Hee University, Seoul, 02447, Korea , Seoul (South Korea)
Type
Published Article
Journal
Korean Journal of Chemical Engineering
Publisher
Springer-Verlag
Publication Date
Aug 08, 2020
Volume
37
Issue
8
Pages
1360–1364
Identifiers
DOI: 10.1007/s11814-020-0586-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

In many catalyst systems, including fuel cell applications, control of the catalyst surface composition is important for improving activity since catalytic reactions occur only at the surface. However, it is very difficult to modify the surface composition without changing the morphology of metal nanoparticles. Herein, carbon-supported Pd3Au1 nanoparticles with uniform size and distribution are fabricated by tert-butylamine reduction method. Pd or Au surface segregation is induced by simply heating as-prepared Pd3Au1 nanoparticles under CO or Ar atmosphere, respectively. Especially, CO-induced Pd surface segregation allows the alloy nanoparticles to have a Pd-rich surface, which is attributed to the strong CO binding energy of Pd. To demonstrate the change in surface composition of Pd3Au1 alloy catalyst with the annealing gas species, the oxygen reduction reaction performance is investigated and consequently, Pd3Au1 catalyst with the highest number of surface Pd atoms indicates excellent catalytic activity. Therefore, the present work provides insights into the development of metal-based alloys with optimum structures and surface compositions for various catalytic systems.

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