Ni-based oxides are earth-abundant materials and recognized as promising electrocatalyst materials for alkaline electrolysers. They offer a favourable combi-nation of high electrochemical activity and stability . Many attempts have been made to improve the electrochemical activity of Ni materials via modification of the composition and structure of the catalyst material, e.g., using doping it with iron ; via novel synthetic design of nanoparticles and porous materials to increase the active surface area ; or OER enhancement through modifications in pH or the type and concentration of ionic species in the electrolyte . It was found that in highly alkaline pH, the degree of surface deprotonation increases, thereby producing negatively charged surface species (NiOO -) that lead to an enhanced OER activity .