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나노입자 연구단
나노입자 연구단
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Rational Generation of Fe-N-x Active Sites in Fe-N-C Electrocatalysts Facilitated by Fe-N Coordinated Precursors for the Oxygen Reduction Reaction

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Title
Rational Generation of Fe-N-x Active Sites in Fe-N-C Electrocatalysts Facilitated by Fe-N Coordinated Precursors for the Oxygen Reduction Reaction
Author(s)
Minhyoung Kim; Ji Mun Yoo; Chi-Yeong Ahn; Jue-Hyuk Jang; Yoon Jun Son; Heejong Shin; Jiho Kang; Yun Sik Kang; Sung Jong Yoo; Kug-Seung Lee; Yung-Eun Sung
Publication Date
2019-11
Journal
CHEMCATCHEM, v.11, no.24, pp.5982 - 5988
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Fe-N-C catalysts synthesized by pyrolysis of Fe and N precursors have been intensively studied due to their remarkable activities for the electrochemical oxygen reduction reaction (ORR). Although Fe-N-4 coordinated structures have been suggested as active sites by recent spectroscopic studies, the influence of precursor coordination on the generation of the active sites during high-temperature pyrolysis is not well understood. In this work, phenanthroline isomers were used as systematic model precursors to reveal the correlation between precursor coordination and active site formation in Fe-N-C catalysts. Coordination between Fe and each phenanthroline isomer was effectively controlled by the molecular structure: monodentate (1,7- and 4,7-phenanthroline) and bidentate coordination (1,10-phenanthroline). Through X-ray absorption spectroscopy and X-ray photoelectron spectroscopy study, large difference in atomic distribution of both Fe and N was revealed; the preferential formation of Fe-N-x active sites was featured only in Fe(1,10-phenanthroline)/KB with homogeneously distributed Fe and highly retained pyridinic N. With Fe-N-x active site moieties, Fe(1,10-phenanthroline)/KB exhibited superior ORR activity and stability in alkaline half-cell and full-cell tests. These results highlight the importance of the use of precursors with multiple coordination (i. e. bidentate) for the effective derivation of Fe-N-x active sites for highly active and stable ORR electrocatalysts. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/6763
ISSN
1867-3880
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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