Figure : Heat map outlining the stability of compositions A) AB2O4 , B) A0.5B2.5O4 and C) A1.5B1.5O4 Stable spinels in this study are considered to have formation energies below 0.03eV/atom with respect to the convex hull D) Frequency plot of all thermodynamically stable materials based on the calculated theoretical overpotential. Materials deemed to have a low theoretical overpotential (less than 0.5eV) marked in dark blue E) Frequency of each metallic element amongst thermodynamically stable spinels for which theoretical overpotentials for OER were also calculated. Elements making up low overpotential compounds (less than 0.5eV) are also labelled in dark blue.