The capacitive electrode with a thickness of 0.2?mm outperformed the other electrodes in all experiments: it reached a maximum current density of 2.53?Am?2 during polarization curves, and was able to store a cumulative total charge of 96013?cm?2 during charge-discharge experiments. The highest relative charge recovery for this electrode was 1.4, which means that 40 % more current can be gained from this capacitive electrode during intermittent operation compared to continuous operation of a noncapacitive electrode. Surprisingly it was possible to increase the performance of the MFC through decrease of the thickness of the capacitive electrode.