SUPERCAPACITOR PERFORMANCE OF POROUS CARBON NANOFIBER COMPOSITES PREPARED BY ELECTROSPINNING POLYMETHYLHYDRO- SILOXANE (PMHS)/POLYACRYLONrrRILE (PAN) BLEND SOLUTIONS

摘要

Supercapacitors have been intensively investigated as primary and/or backup energy storage systems because they can sustain high power levels with long life cycles [1-3]. Many researchers have made efforts to develop and modify carbonaceous materials, such as controlling the pore size distribution, introducing electroactive metallic particles and fabricating hybrid-type cells [4-6], to enhance the energy and power density of supercapacitors. The nonwoven web obtained from the electrospinning was used to produce carbon nanofibers (CNFs), through stabilization, carbonization processes. The CNF produced has a high specific surface area from shallow pores size. Another advantage of the electrospinning is an ease of handling and increase in the energy density due to large specific surface area, an improvement of the conductivity because of increasing density of the contact points, and low cost of preparations of the electrodes. In this work, we used polymethylhydrosiloxane (PMHS) as the catalyst for creating micropores on the outer surface of CNF for lowering fiber diameter. Here porous carbon nanofiber composites (NFCs) were prepared by a simple and effective one-step electrospinning method, followed by stabilization and carbonization with the help of PMHS.