Construction of Dual‐Mesoporous Carbon Fibers Via Coassembly for Supercapacitors

Abstract

Mesoporous carbon fiber (MCF) has shown great application prospects in the field of electrochemical energy storage due to its large specific surface area, large draw ratio, fast electron transfer ability, and good cycle stability. Herein, the dual‐mesoporous carbon fibers (DMCF) is prepared via a coassembly process with phenolic resin oligomers as carbon precursors, sodium silicate (silica precursor) as an assistant, and cetyltrimethylammonium bromide and pluronic F127 as templates. The silica and F127 micelles provide mesoporous sizes of 3.8 and 2.6 nm, respectively. The obtained DMCF has fibrous morphology, high specific surface area, and double mesoporous structure. Compared with carbon fibers with a single pore distribution, DMCF exhibits an excellent specific capacitance of 264 F g−1 at 0.5 A g−1 and shows good cycle stability as an electrode material in supercapacitors, demonstrating the enormous potential of DMCF in energy‐storage applications.

Molecular Modification of Lignin-Based Carbon Materials: Influence of Supramolecular Bonds on the Properties

“…As electrode material, the improvement of discharge specific capacitance is the primary goal. , The specific surface area and graphitization degree of carbon fibers are two critical factors to improve the performance of discharge specific capacitance . Many strategies have been designed and developed to improve the properties of lignin-based carbon fiber materials, including organic modification, phosphating modification, lignin raw material classification, and so on. ,,− However, not only do these strategies have complex operations but also the results are only aimed at the improvement of the specific surface area of lignin-based carbon fibers. Furthermore, the introduction of modifying reagents results in some adverse factors for the formation of graphite carbon in the carbonization process .…”