| 초록 |
In this study, we investigated the correlation between the oxygen functional group of activated carbons (ACs) and electrochemical characteristics. ACs were prepared by the H3PO4 pre-treatment and subsequent steam activation. Besides, the ACs were heat-treated at 200-900℃ for one hour under two gas atmosphere (N2 and H2/N2 mixing gas). The textural properties were studied by Brunauer-Emmett-Teller, Barrett-Joyner-Halenda equations, and nonlocal density functional theory with N2/77K adsorption isotherms. The reduction characteristics of ACs were investigated through Temperature Programmed Reduction (TPR) under N2 and H2/N2 mixing gas atmosphere. Also, oxygen functional group changes with the heat-treated condition were observed by FT-IR and XPS. As a result, the decrease in the oxygen functional group of the AC was found by the reduction step. Meanwhile, the electrochemical performance of the ACs were significantly enhanced after the reduction process. |
