Nitrogen-induced deep reconstruction and formation of a high-valent nickel species γ-NiOOH surface layer on NiFe alloy /NiFeN pre-catalysts for efficient water oxidation

The development of a γ-NiOOH surface layer on NiFe alloy /NiFeN as well as Fe doping improved the adsorption energy of the oxygen-containing species and increased the OER catalytic activity.