| 초록 |
The effect of electrolyte solutions on the characteristics of the current-voltage (I-V) curve in a cation-exchange membrane was studied based on the concentration polarization and electroconvection theory. The study includes investigation on the limiting current density (LCD) and plateau length of the I-V curve. The differences in the plateau length with the electrolytes were explained by the Peclet number (Pe) representing a transport pattern in the electroconvection theory. Since the Peclet number is proportional to the Stokes radius of an ion. The electrolyte with a larger Stokes radius has a shorter plateau length compared to the electrolyte with a smaller Stokes radius. Water-splitting measurements for the different electrolyte solutions in the CMX membrane revealed that the contribution of water splitting to the overlimting current was insignificant regardless of the electrolytes used in this study. However, when metal hydroxides, such as Al(OH)3, formed on the surface of the membrane, significant water splitting was observed. |
