The stability of Co0.5Fe0.5O0.5F1.5 was next evaluated through chronopotentiometry, switching between several current densities over the course of 27 days without pause (Fig. ). Rotating ring disk electrode (RRDE) measurements confirmed that the current was indeed originating from the OER (Fig. ). Chronopotentiometric evaluation of Co0.5Fe0.5O0.5F1.5: the activity did not noticeably decrease through 27 days of measurement (d).