Figure 4: OER improvements on other mixed metal oxides by electrochemical tuning.

(a) XRD patterns of mixed lithium transition metal oxides. (b) Polarization curves of mixed lithium transition metal oxides before and after delithiation. (c) Onset potentials (potentials required to reach 0.1 mA cm−2) of the various catalysts for OER, the error bars are defined by at least five independent measurements. (d) Cycling stability of De-LiCo0.33Ni0.33Fe0.33O2 catalyst. (e) Comparison of polarization curves of De-LiCo0.33Ni0.33Fe0.33O2 and 20 wt% Ir/C catalysts. (f) Tafel slopes of De-LiCo0.33Ni0.33Fe0.33O2 and 20 wt% Ir/C catalysts. The error bars in panel c are defined by calculating the relative deviations from more than 5 independent experiments.