The AST once more causes the η OER to decrease for the Mn70Ti30Ox composition. However, the Tafel slope increased (see Figure ). This outcome suggests that OER kinetics worsened after the AST, implying that the improvement in OER activity might stem from extrinsic factors, e.g., an increase in surface area. Surface roughening due to dissolution is one option that could cause an increase in the electrochemically active surface area, exposing more active sites to catalysis. On the other hand, the kinetics improved slightly for the Mn90Co10Ox sample. Pinning down the exact mechanism is complicated and requires more elaborate in-situ testing. However, attention was devoted to the increase in activity for Ti-incorporated MnOx samples due to its irregular behavior compared to all other samples.