A fixed voltage (Eap) was added to the reactor circuit using
a power source (model 3645A; Circuit Specialists, Inc.). A
resistor (10Ω) was connected in series with the power supply,
and the voltage across the resistor was measured using a
multimeter (model 2700; Keithley Instruments, Inc.) to
calculate the current. The positive lead of the power source
was connected to the anode, and the negative lead was
connected to the resistor in the circuit connecting the
electrodes.AnAg/AgCl reference electrode (RE-5B; BASi) was
placed in the reactor, and the anode potential was recorded
using the multimeter.