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Preparation and Electrocapacitive Properties of Hierarchical Porous Carbons Based on Loofah Sponge

by Zichao Li 1,3, Kuilu Zhai 2,3, Guoqiang Wang 1,3, Qun Li 2,3,* and Peizhi Guo 1,3,*
1
State Key Laboratory Breeding Base of New Fiber Materials and Modern Textile, Institute of Materials for Energy and Environment, School of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
2
School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
3
Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Haolin Tang
Materials 2016, 9(11), 912; https://doi.org/10.3390/ma9110912
Received: 2 October 2016 / Revised: 4 November 2016 / Accepted: 7 November 2016 / Published: 10 November 2016
Four porous carbon samples denoted as LSC-1, LSC-2, LCS-3, and LSC-4 were prepared by carbonization of loofah sponge pretreated by ZnCl2 activation, immersion in N,N-dimethylformamide (DMF), DMF-assisted solvothermal and melamine-assisted hydrothermal processes, and the specific surface areas were 1007, 799, 773, and 538 m2·g−1 with mainly micropores, respectively. Electrocapacitive properties of four porous carbon-based electrodes were investigated with cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy in symmetric supercapacitors. All the cyclic voltammetries of four types of supercapacitors showed a rectangular shape, even under a high scan rate of 500 mV·s−1. The capacitances of LSC-1, LSC-2, LSC-3, and LSC-4 were 107.4, 92.5, 60.3, and 82.3 F·g−1 at the current density of 0.1 A·g−1, respectively, and LSC-1 displayed the excellent capacitance retention of about 81.3% with a current density up to 5 A·g−1. All supercapacitors showed excellent electrochemical stability, and the LSC-1-based supercapacitor showed a cycle stability with 92.6% capacitance retention after 5000 cycles at 1 A·g−1. The structure–property relationship of LSC samples is discussed and analyzed on the basis of the experimental data. View Full-Text
Keywords: loofah sponge; porous carbon; biomass; carbonization; capacitance loofah sponge; porous carbon; biomass; carbonization; capacitance
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Li, Z.; Zhai, K.; Wang, G.; Li, Q.; Guo, P. Preparation and Electrocapacitive Properties of Hierarchical Porous Carbons Based on Loofah Sponge. Materials 2016, 9, 912.

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