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Received March 15, 2020
Accepted May 20, 2020
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Surface engineering of Pd-based nanoparticles by gas treatment for oxygen reduction reaction
A. Anto Jeffery1
Sang-Young Lee2
Jiho Min1
Youngjin Kim1
Seunghyun Lee1
Jin Hee Lee3
Namgee Jung1†
Sung Jong Yoo4 5†
1Graduate School of Energy Science and Technology (GEST), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea 2The Environment Technology Institute, Research Division, Coway R&D Center, 1 Guanak-ro, Gwanak-gu, Seoul 08826, Korea 3Center for Environment & Sustainable Resources, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea 4Center for Hydrogen·Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea 5Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Seoul 02792, Korea
njung@cnu.ac.kr
Korean Journal of Chemical Engineering, August 2020, 37(8), 1360-1364(5)
https://doi.org/10.1007/s11814-020-0586-2
https://doi.org/10.1007/s11814-020-0586-2
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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.
Keywords
References
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Yin Z, Chi M, Zhu Q, Ma D, Sun J, Bao X, J. Mater. Chem. A, 1, 9157 (2013)
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Kumikov VK, Khokonov KB, J. Appl. Phys., 54, 1346 (1983)
Mezey LZ, Giber J, Appl. Phys. A-Mater. Sci. Process., 35, 87 (1984)
Zhang J, Jin H, Sullivan MB, Lim FCH, Wu P, Phys. Chem. Chem. Phys., 11, 1441 (2009)
Greeley J, Mavrikakis M, Catal. Today, 111(1-2), 52 (2006)
Patterson A, Phys. Rev., 56, 978 (1939)
Nascente PAP, De castro SGC, Landers R, Kleiman GG, Phys. Rev. B, 43, 4659 (1991)
Hoshi N, Kida K, Nakamura M, Nakada M, Osada K, J. Phys. Chem. B, 110(25), 12480 (2006)
