Fe-based non-noble metal catalysts with dual active sites of nanosized metal carbide and single-atomic species for oxygen reduction reaction

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Single-atom catalysts have been considered as representative non-noble metal catalysts for replacing the platinum catalyst. Fundamentally, the dispersion of metal atoms on a carbon support with limited surface area results in extremely low loading of the active metal, leading to a thick electrode and low volumetric energy density. In this study, we present a facile strategy for increasing the active metal densities on the M-N-C catalyst through the use of dual active sites such as Fe-N-x and nanosized Fe3C that have different reaction pathways involving 4 and 2 + 2 (or 2 x 2) electrons, respectively. The dual active sites were realized by the addition of Zn that affects the physical shielding of Fe and energy bypass, leading to the formation of single-atomic Fe-N-x species and nanosized Fe3C with similar to 2 nm. Our catalyst exhibits superior oxygen reduction reaction activity to that of the commercial 20 wt% Pt/C catalysts both in half cell (onset potential, 0.95 V; half-wave potential, 0.9 V) and single cell (maximum power density, 367 mW cm(-2)). Therefore, we expect that our facile strategy would open an avenue for the rational design and synthesis of highly loaded active Fe-based catalysts.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-11
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.42, pp.22379 - 22388

ISSN
2050-7488
DOI
10.1039/d0ta07748h
URI
http://hdl.handle.net/10203/278989
Appears in Collection
CBE-Journal Papers(저널논문)
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