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Catalysts 2016, 6(6), 86; doi:10.3390/catal6060086

Oxygen Reduction Electrocatalysts Based on Coupled Iron Nitride Nanoparticles with Nitrogen-Doped Carbon

1
Fuel Cell Research Center, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 02792, Korea
2
Department of Energy and Environmental Engineering, Korea University of Science and Technology, Daejeon 34113, Korea
3
Computational Science Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 02792, Korea
4
Department of Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon 34113, Korea
5
Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Vincenzo Baglio and David Sebastián
Received: 14 April 2016 / Revised: 26 May 2016 / Accepted: 6 June 2016 / Published: 15 June 2016
(This article belongs to the Special Issue Catalysis for Low Temperature Fuel Cells)
View Full-Text   |   Download PDF [6093 KB, uploaded 15 June 2016]   |  

Abstract

Aimed at developing a highly active and stable non-precious metal electrocatalyst for oxygen reduction reaction (ORR), a novel FexNy/NC nanocomposite—that is composed of highly dispersed iron nitride nanoparticles supported on nitrogen-doped carbon (NC)—was prepared by pyrolyzing carbon black with an iron-containing precursor in an NH3 atmosphere. The influence of the various synthetic parameters such as the Fe precursor, Fe content, pyrolysis temperature and pyrolysis time on ORR performance of the prepared iron nitride nanoparticles was investigated. The formed phases were determined by experimental and simulated X-ray diffraction (XRD) of numerous iron nitride species. We found that Fe3N phase creates superactive non-metallic catalytic sites for ORR that are more active than those of the constituents. The optimized Fe3N/NC nanocomposite exhibited excellent ORR activity and a direct four-electron pathway in alkaline solution. Furthermore, the hybrid material showed outstanding catalytic durability in alkaline electrolyte, even after 4,000 potential cycles. View Full-Text
Keywords: oxygen reduction reaction; non-precious metal electrocatalysts; Iron nitride; nitrogen-doped carbon oxygen reduction reaction; non-precious metal electrocatalysts; Iron nitride; nitrogen-doped carbon
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Park, M.J.; Lee, J.H.; Hembram, K.P.S.S.; Lee, K.-R.; Han, S.S.; Yoon, C.W.; Nam, S.-W.; Kim, J.Y. Oxygen Reduction Electrocatalysts Based on Coupled Iron Nitride Nanoparticles with Nitrogen-Doped Carbon. Catalysts 2016, 6, 86.

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