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

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 na...

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Published inThe Korean journal of chemical engineering Vol. 37; no. 8; pp. 1360 - 1364
Main Authors Jeffery, A. Anto, Lee, Sang-Young, Min, Jiho, Kim, Youngjin, Lee, Seunghyun, Lee, Jin Hee, Jung, Namgee, Yoo, Sung Jong
Format Journal Article
LanguageEnglish
Published New York Springer US 01.08.2020
Springer Nature B.V
한국화학공학회
Subjects
Alloy development
Alloy systems
Alloys
Atomic properties
Biotechnology
Carbon monoxide
Catalysis
Catalysts
Catalytic activity
Chemistry
Chemistry and Materials Science
Composition
Fuel cells
Gold
Industrial Chemistry/Chemical Engineering
Materials Science
Morphology
Nanoalloys
Nanoparticles
Oxygen reduction reactions
Palladium
화학공학
Metal Alloy
Oxygen Reduction Reaction
Surface Composition
CO-induced Surface Segregation
Catalyst
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Summary: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 Pd 3 Au 1 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 Pd 3 Au 1 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 Pd 3 Au 1 alloy catalyst with the annealing gas species, the oxygen reduction reaction performance is investigated and consequently, Pd 3 Au 1 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.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-020-0586-2