Abstract: A simple CDI(capacitive deionization) reactor device was fabricated with the carbon electrodes of likesuper capacitance activated carbon made by coating. The specific surface area and pore size distribution were measured by BET and DFT while the surface morphology and structure were observed with SEM. The electrodes’ performance and electrochemistry reactions were discussed followed by the measurement of conductivity， pH value in solution at different bias potentials. It was indicated that the likesuper capacitance activated carbon was an ideal electrodes’ material due to its advanced microporous and mesoporous. The removal efficiency for ions rose with the increase of potentials which were among 08~18V， then the ions adsorbed on the electrode surface were able to desorb absolutely within 30min， so the electrodes can be recycled easily. According to the changes of pH value in solution at different bias potentials， the electrochemical reactions at the surface between electrodes and solution were anaylsed.

Key words: likesuper capacitance activated carbon, capacitive deionization, potential, pH value, coating