Fig. 6. (a) OCV, (b) overpotentials (ΔV), and (c) the relative proportion of overpotential, at the top of charge (TOC) and bottom of discharge (BOD) as a function of cycle numbers for the full cell and individual electrode (cathode or anode vs. DHE). For (a), the purple line is the difference of OCV between cathode and anode. For (b), the purple line is the sum of overpotential of individual electrodes (cathode + anode).