Spanos, IoannisMasa, JustusZeradjanin, AleksandarSchlögl, Robert2022-11-162022-11-162021Spanos, I., Masa, J., Zeradjanin, A., & Schlögl, R. (2021). The effect of iron impurities on transition metal catalysts for the oxygen evolution reaction in alkaline environment: activity mediators or active sites?. Catalysis Letters, 151(7), 1843-1856.https://doi.org/10.1007/s10562-020-03478-4https://nru.uncst.go.ug/handle/123456789/5295There is an ongoing debate on elucidating the actual role of Fe impurities in alkaline water electrolysis, acting either as reactivity mediators or as co-catalysts through synergistic interaction with the main catalyst material. This perspective summarizes the most prominent oxygen evolution reaction (OER) mechanisms mostly for Ni-based oxides as model transition metal catalysts and highlights the effect of Fe incorporation on the catalyst surface in the form of impurities originating from the electrolyte or co-precipitated in the catalyst lattice, in modulating the OER reaction kinetics, mechanism and stability.enAlkaline water electrolysis · Electrocatalysis · Fe impurities · Reaction mechanismArticle