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Title
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Enhancement of Mn-N-C single atom catalysts via sulfur and/or oxygen co-doping for oxygen reduction in acidic conditions : unveiling the catalyst durability in fuel cells
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Author
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Abstract
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| Carbon-supported single Mn sites coordinated with nitrogen (Mn-N-C) catalysts are amongst the most favorable platinum group metal-free (PGM-free) catalysts for proton exchange membrane fuel cells (PEMFCs). However, the high overpotential of these catalysts, limits their application for oxygen reduction reaction (ORR). Experi-ments showed that O and S heteroatom co-doping increases the catalytic activity of Mn-N-C catalysts for elec-trochemical gas conversion. This prompted us to perform a systematic investigation of the formed co-doped configurations at the atomic scale and to study the corresponding reaction mechanisms for oxygen reduction in acidic environment. All probable configurations for Mn-NxOySz/C10 complexes are considered and the most stable and durable structures are selected as ORR active catalysts. Our results confirm the strong stabilization of the Mn sites over N4- and N3-doped carbonaceous support and consequently their stability against oxidation in contrast to other O and/or S co-doped heterostructures. |
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Language
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English
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Source (journal)
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Molecular catalysis. - New York, N.Y., 2017, currens
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Publication
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New York, N.Y.
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Elsevier
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2024
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ISSN
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2468-8231
[online]
2468-8274
[print]
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DOI
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10.1016/J.MCAT.2023.113745
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Volume/pages
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553
(2024)
, p. 1-8
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Article Reference
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113745
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ISI
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001140568800001
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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