Double coordination shell modulation of nitrogen-free atomic manganese sites for enhancing oxygen reduction performance.

ABSTRACT: The rational design and fabrication of the active sites of single-atom catalysts (SACs) remains the main breakthrough for efficient electrocatalytic oxygen reduction reaction (ORR). Although metal-nitrogen-carbon (M-N-C) materials have been reported to exhibit good ORR performance, the M-N bond is prone to oxidation and subsequent destruction in Fenton-like reactions. Here, we report a nitrogen-free Mn-based SAC (Mn-S₁O₄G-600) anchored on a nitrogen-free graphene substrate, where manganese is bound to four oxygen atoms and one sulfur atom across two different coordination shells. In 0.1 M KOH, the Mn-S₁O₄G-600 demonstrates a half-wave potential of 0.86 V and a high kinetic current density of 10.3 mA cm^-2 at 0.6 V. Due to the lack of ni

SUBMITTER: Bai X 

PROVIDER: S-EPMC11575636 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature