We then further examine the relationship between the two most important features identified by our random-forest model, the Bader charge and the O2p bandcenter of adsorbate oxygen, and the binding energies of *O, *OH and *OOH. We plot the relationship between the binding energies of *O and *OH and demonstrate that any increases in the Bader charge of adsorbate oxygen can be associated with an increase in the binding energies of the *O, *OH and *OOH intermediates. Furthermore, increases in the distance between the O2p bandcenter and the Fermi level are associated with decreases in the binding energies of *O (Figure ) and *OH (Figure ). We then plot ∆𝐸 𝑂 -∆𝐸 𝑂𝐻 against both the oxygen bandcenter and the Bader charge of the adsorbate oxygen in the *O intermediate (Figure ). We see that the relationship between ∆𝐸 𝑂 -∆𝐸 𝑂𝐻 and the Bader charge of oxygen resembles that of a volcano plot; ∆𝐸 𝑂 -∆𝐸 𝑂𝐻 increases when going from a Bader charge of -1.4e -to -0.5e -before decreasing against from -0.5 e -to -0.1 e -. ∆𝐸 𝑂 -∆𝐸 𝑂𝐻 decreases as the O-2p bandcenter moves further away from the Fermi level, a relationship that can be corroborated by Nørskov and coworkers . Since the optimal ∆𝐸 𝑂 -∆𝐸 𝑂𝐻 would be between 1.5 -1.7 eV, the ideal catalyst is likely to have an oxygen Bader charge between -0.3e -and -0.6e -and an O-2p bandcenter between 2eV and 4eV below the Fermi level. Screening for catalysts based on both descriptors is likely to lead to the identification of more highly active catalysts for OER. Out of the 33 possible candidates predicted to have theoretical overpotentials below 0.5 V, three Co-based spinel oxides, Co1.5Al1.5O4, Co2.5Ga0.5O4, Co1.5Ga1.5O4, were selected for synthesis and experimental characterization based on their novelty. They were synthesized via electrodeposition onto a carbon paper substrate. In order to obtain compounds that have a similar composition to these predicted materials, stoichiometric mixtures of the salts Co(NO3)2, Ga(NO3)3 and Al(OH)(C2H3O2)2 were dissolved in the electrolyte solution used for electrodeposition in all three cases. Co3O4 was also synthesized for benchmarking purposes since it is well-known to be active for OER . After synthesizing these materials, their morphologies and chemical compositions were characterized with SEM and energy dispersive X-ray spectroscopy (EDS) mapping. The SEM images of all four catalysts (Figure ) reveal the presence of an amorphous material evenly deposited on the surface of the carbon substrate. EDS maps (Figures ) of Co3O4 and Co-Al oxide indicate that all the constituent elements of both materials are uniformly distributed. In contrast, the elements in the Co-Ga oxide samples show greater heterogeneity in their distribution over the surface of the material. This seems to indicate the presence of another phase.