Mechanistic aspects of the reactions in magnesium-air batteries: The presence of common additives such as the water scavenger borohydride and a complexing agent (18-c-6) leads to a multitude of electro-catalyzed and purely chemical side re...
Simultaneously Incorporating Atomically Dispersed Co‐Nx Sites with Graphitic Carbon Layer‐Wrapped Co9S8 Nanoparticles for Oxygen Reduction in Acidic Electrolyte
Von Wiley-VCH zur Verfügung gestellt
Co9S8 nanoparticles, when incorporated with the Co single atom catalysts, provide a synergistic catalyst for oxygen electroreduction in acid solution. Catalysts composed of both components are stable under operating conditions and have been shown to operate well within a fuel cell environment.
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 VRHE 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.Zum Volltext
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