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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

SSRN, ISSN: 1556-5068
2023
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  • Usage
    129
    • Abstract Views
      107
    • Downloads
      22

Article Description

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). Experiments showed that O and S heteroatom co-doping increases the catalytic activity of Mn-N-C catalysts for electrochemical CO2 reduction. 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

Bibliographic Details

parisa nematollahi; Erik C. Neyts

Elsevier BV

Multidisciplinary; Heteroatom doping; Oxygen reduction reaction; Mn-N-C catalyst; co-doping; fuel cell

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