By substituting a single surface ruthenium atom with a nickel atom we get two possible local structures A and B. Comparing the binding energies of oxygen in these surfaces to those of the pure structure, it is clear that the biggest change is present in structure A at position 1. The binding energy of this oxygen has been severely weakened due to the introduction of the neighboring Ni in the bridge. The binding energy of 1.48 eV is still strongly bound compared to the ideal catalyst, however one could imagine this oxygen site becoming an active site for the OER at elevated electrode potentials. Structure B is, however, similar to the pure surface, except for the deactivated nickel CUS site.