期刊
CHEMICAL ENGINEERING JOURNAL
卷 263, 期 -, 页码 62-70出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.10.070
关键词
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. (C) 2014 Elsevier B.V. All rights reserved.
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