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	Investigations of carbon nitride-supported MN3O4 oxide nanoparticles for ORR Alexander I. Large , Sebastian Wahl , Salvatore Abate , Ivan Da Silva , Juan Jose Delgado Jaen , Nicola Pinna , Georg Held , Rosa Arrigo Catalysts 10 DOI: 10.3390/catal10111289 Open Access Show Abstract ▼ Abstract: Earth-abundant Mn-based oxide nanoparticles are supported on carbon nitride using two different immobilization methods and tested for the oxygen reduction reaction. Compared to the metal free CN, the immobilization of Mn oxide enhances not only the electrocatalytic activity but also the selectivity towards the 4e- reduction reaction of O2 to H2O. The XPS analysis reveals the interaction of the pyridine N species with Mn3O4 nanoparticles being particularly beneficial. This interaction is realized—although to a limited extent—when preparing the catalysts via impregnation; via the oleic acid route it is not observed. Whilst this work shows the potential of these systems to catalyze the ORR, the main limiting factor is still the poor conductivity of the support which leads to overpotential.	Nov 2020

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