Water shortage is one of the most critical problems that endanger humankind. To solve this problem, there have been many efforts to secure fresh water by desalination. Capacitive deionization (CDI) technology could be an effective way of desalination. In spite of many researches for increasing the performance of the CDI, a few studies have reported the effect of important parameters such as electrode capacitance on CDI. Furthermore, most of the researches on CDI have been focused on the single-cell system only, though multi-cell system is required to secure a substantial amount of fresh water. This study evaluated the performance of single-cell (1 electrode pair) and multi-cell systems (40 electrode pair) in relation to electrode capacitance. The electrode capacitance was examined by using cyclic voltammetry and impedance spectroscopy. Afterwards, the obtained deionization performance of single-cell and multi-cell systems was correlated with the theoretical ion removal efficiency evaluated by electrode capacitance.

Performance evaluation of CDI system based on electrode capacitance

244th National Meeting (2012)

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