Unraveling Oxyanion Effects on Oxygen Evolution Electrocatalysis of Nickel Hydr(oxy)oxides: The Critical Role of Fe Impurities

Raman spectroscopy, reveal that Fe enhances Ni reducibility/redox reversibility. X-ray absorption spectroscopy and density functional theory calculations indicate that Fe preferentially adsorbs on Ni surface sites with higher deprotonation energy. These findings reveal the critical role of surface-adsorbed Fe in modulating Ni hydr(oxy)oxide activity and highlight overlooked impurity effects in electrocatalysis when studying additive effects in electrolyte modulation.