| 초록 |
In recent decades, semi-permanent and renewable energy storage materials have received a lot of attention, among which carbon nanofibers (CNFs) have been widely studied as supercapacitor electrodes with the advantages of high performance in specific capacitance, power density, and operational stability. In this study, mixtures with different lignin/poly(vinyl pyrrolidone) (PVP) ratios are used as carbon precursors for the porous shell part, and PVP is used as the core part through coaxial electrospinning. The electrospun nanofibers are then heat-treated at different temperatures to develop a porous core-shell type structure through stabilization and carbonization. The microstructural features of porous core-shell CNFs are characterized using SEM, TEM, EDS, TGA, XRD, and BET analyses. The electrical and electrochemical properties are investigated using electrometry, cyclic voltammetry, charge-discharge test, and electrical impedance spectroscopy. |
