Filtern
Erscheinungsjahr
- 2023 (1)
Dokumenttyp
Sprache
- Englisch (1)
Referierte Publikation
- ja (1)
Schlagworte
- Co−N-Cs (1)
- Fuel cells (1)
- Oxygen reduction reaction (1)
- PGM-free catalysts (1)
- Single-atom catalysts (1)
Organisationseinheit der BAM
- 3.6 Elektrochemische Energiematerialien (1) (entfernen)
A facile yet robust synthesis is reported herein to simultaneously incorporate atomically dispersed Co-Nₓ sites with graphitic layer-protected Co₉S₈ nanoparticles (denoted as Co SACs+Co₉S₈) as an efficient electrocatalyst for oxygen reduction in acidic solution. The Co SACs+Co₉S₈ catalyst shows low H₂O₂ selectivity (∼5 %) with high half-wave potential (E1/2) of ∼0.78 V(RHE) in 0.5 M H₂SO₄. The atomic sites of the catalyst were quantified by a nitrite stripping method and the corresponding site density of the catalyst is calculated to be 3.2×10¹⁸ sites g⁻¹. Besides, we also found the presence of a reasonable amount of Co₉S₈ nanoparticles is beneficial for the oxygen electrocatalysis. Finally, the catalyst was assembled into a membrane electrode assembly (MEA) for evaluating its performance under more practical conditions in proton exchange membrane fuel cell (PEMFC) system.