Microstructural and Electrochemical Characterization of Porous Hollow Carbon Nanofibers Manufactured by Coaxial Electrospinning and Heat Treatment
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내용
In recent decades, carbon nanofibers (CNFs) have been widely investigated as self-standing electrode materials for energy storage devices with high performance in specific capacitance, energy density, power density, and operational stability. Porous hollow carbon nanofibers (PHCNFs) are also studied as a promising electrode material with enhanced surface area. In this study, a series of PHCNFs is manufactured via coaxial electrospinning of polyimide (PI) precursor/lignin mixture as the shell solution and PMMA as the core solution, followed by heat treatment at different temperatures. The microstructural features of PI/lignin-derived PHCNFs as a function of the heat treatment temperature are characterized by using SEM, TEM, EDS, TGA, XRD, XPS and BET analyses. The electrical and electrochemical properties of the PHCNFs are investigated by using electrometry, cyclic voltammetry, galvanostatic charge-discharge test, and electrical impedance spectroscopy.