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Effect of post heat-treatment of composition-controlled PdFe nanoparticles for oxygen reduction reaction

Cited 36 time in Web of Science Cited 37 time in Scopus
Authors

Kang, Yun Sik; Choi, Kwang-Hyun; Ahn, Docheon; Lee, Myeong Jae; Baik, Jaeyoon; Chung, Dong Young; Kim, Mi-Ju; Lee, Stanfield Youngwon; Kim, Minhyoung; Shin, Heejong; Lee, Kug-Seung; Sung, Yung-Eun

Issue Date
2016-01
Publisher
Elsevier BV
Citation
Journal of Power Sources, Vol.303, pp.234-242
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 similar to 3 and similar to 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 similar to 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.
ISSN
0378-7753
URI
https://hdl.handle.net/10371/213045
DOI
https://doi.org/10.1016/j.jpowsour.2015.11.011
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Fuel Cell, Lithium ion batteries, Solar Cell, 리튬 이온 배터리, 연료전지, 태양전지

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