Hierarchical porous carbon fibers prepared using a SiO2 template for high-performance EDLCs

作者：Lee Dayoung; Jung Jin Young; Jung Min Jung; Lee Young Seak^*

来源：Chemical Engineering Journal, 2015, 263: 62-70.

DOI：10.1016/j.cej.2014.10.070

• Activation
• Capacitance
• Hierarchical porous carbon fibers
• Network pore structure
• Electric double-layer capacitor

A simple method for preparing hierarchical porous carbon fibers with micropores and mesopores was developed using electrospun PAN (polyacrylonitrile) fibers, a SiO2 (silica) template, and KOH (potassium hydroxide) activation. The diameter of well-developed hierarchical porous carbon fibers was presented 500 nm and 1 mu m by using FE-SEM. The prepared hierarchical porous carbon fibers had high specific surface areas (1625-1796 m(2)/g) and hierarchical pore structures with micropore (below 2 nm), mesopore (2-5 nm, and 10-50 nm), and macropore (>50 nm). The hierarchical porous carbon fibers were used as electrodes in electric double-layer capacitors (EDLCs) to measure the specific capacitance and retained capacitance ratio. This unique hierarchical pore structure had a synergistic effect, resulting in excellent specific capacitances (197 and 172 F/g at scan rate 5 and 50 mV/s, respectively) and retained capacitance ratios improved from 60.8% to 873%. The enhanced EDLC performance demonstrates the potential of hierarchical porous carbon fibers prepared with a SiO2 template and KOH activation.

• 出版日期2015-3-1