| 초록 |
Activated carbon (AC) has been fluorinated according to various fluorine and nitrogen partial pressure for capacitive deionization(CDI) electrode materials to improve their performance. To investigate the changes in the surface functional groups of AC and fluorinated AC, X-ray photoelectron spectroscopy (XPS) analysis was carried out. Specific capacitance and salt adsorption capacity were measured by cyclic voltammetry (CV) and CDI experiments, respectively. The highest salt adsorption capacity of 10.3 mg/g was obtained when fluorine partial pressure was 20, along with an excellent specific capacitance of 250 F/g. Such good electrosorption performance is attributed that decrease of co-ion expulsion effect and increase of counter-ion driving force by high electronegativity of fluorine that introduced AC surface. Thus, the fluorinated AC prepared indicates that they are very promising candidate as electrode materials for CDI application. |
