For the sake of comparison, the system is assumed to relax within the first 24 h and Figure shows that the decay in voltage is proportional to the square root of time, suggesting mostly diffusion based processes also in agreement with other reports . The voltage decay value for the diffusion phase was calculated to be the slope of the linear fit of voltage over the square root of time and the values for all cells are plotted in Figure . For the CC formed cells values between -2.5 and -3.5 mV √h, whereas the values for the pulsed cells are slightly higher between -3 and -4.5 mV √h.