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나노입자 연구단
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Effect of post heat-treatment of composition-controlled PdFe nanoparticles for oxygen reduction reaction Highly Cited Paper

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Title
Effect of post heat-treatment of composition-controlled PdFe nanoparticles for oxygen reduction reaction
Author(s)
Yun Sik Kang; Kwang-Hyun Choi; Ahn, D.; Myeong Jae Lee; Baik, J.; Dong Young Chung; Mi-Ju Kim; Stanfield Youngwon Lee; Minhyoung Kim; Heejong Shin; Lee, K.-S.; Yung-Eun Sung
Publication Date
2016-01
Journal
JOURNAL OF POWER SOURCES, v.303, no., pp.234 - 242
Publisher
ELSEVIER SCIENCE BV
Abstract
Composition-controlled and carbon-supported PdFe nanoparticles (NPs) were prepared via a modified chemical synthesis after heat-treatment at high temperature under a reductive atmosphere. This novel synthesis, which combines the polyol reduction method and hydride method, was used to obtain monodispersed PdFe NPs. In addition, to induce structural modifications, the as-prepared PdFe NPs received heat-treatment under a reductive atmosphere. Structural characterization, including high-resolution powder diffraction (HRPD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) analysis, indicated that heat-treated PdFe NPs exhibited a higher degree of alloying and surface Pd atomic composition compared with as-prepared ones. Furthermore, new crystalline phases were detected after heat-treatment. Thanks to the structural alterations, heat-treated PdFe NPs showed ∼3 and ∼18 times higher mass- and area-normalized oxygen reduction reaction (ORR) activities, respectively than commercial Pt/C. Single cell testing with heat-treated PdFe catalysts exhibited a ∼2.5 times higher mass-normalized maximum power density than the reference cell. Surface structure analyses, including cyclic voltammetry (CV), COad oxidation, and XPS, revealed that, after heat-treatment, a downshift of the Pd d-band center occurred, which led to a decrease in the affinity of Pd for oxygen species, resulting in more favorable ORR kinetics. © 2015 Elsevier B.V
URI
https://pr.ibs.re.kr/handle/8788114/2198
ISSN
0378-7753
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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