New insight into the performance analysis of ow-electrode capacitive deionization by varying the operation voltage

Abstract

In the flow-electrode capacitive deionization (FCDI), the highly activated porous carbon electrodes of the slurry phase flows through the channels of current collectors adsorbs the salt ions when a voltage is applied. In this study, the eect of voltage on the performance of a FCDI cell is experimentally investigated. The voltage is applied on the top corner of a FCDI cell (Vapply) and simultaneously the voltage of the central cell (Vcell) is measured. The experiments were conducted by applying voltages from 0.6 to 3.9 V. The experimental results show that the dierence between Vapply and Vcell is a function of salt concentrations of the feed water. The higher voltages (Vapply > 1:2V) can be used for increasing the salt removal eciency (E) for higher salt water concentrations without electrolysis. Also, the results show that E increases along with the applied voltage. A series of pH measurements were done for investigating the electrolysis point of the setup.