Representative charge injection plots of electrodes in one array in PBS. A monophasic cathodic current pulse was injected through the EIROF electrodes (a), while monitoring the resulting voltage (b), which also shows a +0.6 V anodic voltage bias applied to the channel under study. Current pulses of 150 μs in width were used with +0.6 V bias, and cathodic current intensity, in (a), was kept below the resulting potentials of −0.6 V versus Ag/AgCl, at which point Qinj values were obtained. Qinj of EIROF in the PBS was 1.39 ± 0.68 mC/cm2 . When the maximum potential excursion was extended to −1.2 V, its corresponding Qinj was 2.65 ± 1.56 mCm/cm2.