| 초록 |
In this work, kenaf-derived activated carbons (KAC) were prepared as electrode materials for an electric double-layer capacitor (EDLC) by techniques of phosphoric acid stabilization and steam activation. The microstructural properties of KAC were observed using X-ray diffraction. The textural properties were studied by BET, BJH, and NLDFT equations with N2/77K adsorption isotherms. The electrochemical properties of the KAC were analyzed by using GCD, CV, and electrochemical impedance spectroscopy.From the results, the specific surface area and mesopore volume ratio of the KAC was determined to be 1,500-1,900 m2/g and 35.0-67.2%, respectively. This high specific surfacearea and mesopore-rich characteristics of KAC is originated from the degraded and cross-linked crystallite of kenaf by phosphoric acid stabilization. Also, high specific surface area and mesopore volume ratio led to excellent electrochemical performance as EDLC electrodes, including a high specific capacitance. |
