During EC, a DC power supply (BK-Precision, USA) was used in the intensiostat mode; cell voltage (U) was measured. Current (I) was varied in order to achieve current density values (j) between 7.5 and 65 mA/cm 2 .
During EC, a DC power supply (BK-Precision, USA) wasused in the intensiostat mode; cell voltage (U) was measured. Current(I) was varied in order to achieve current density values (j) between7.5 and 65 mA/cm2.