Optimization of the Capacitance of Activated Carbon in Symmetric Capacitive Deionization System

A new criterion and a potentiostatic method were carried out in order to define the electrochemically stable potential window (ESPW) of symmetric activated carbon electrodes cell, for capacitive ionization application in water solution with different concentration of NaCl salt. Moreover, the effect of thermal treatment of the activated carbon on the specific capacitance was investigated. The specific capacitance of activated carbon treated at 450 °C present an important increase of specific capacity of 42 F g
^-1
compared with untreated activated carbon.