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Materials 2016, 9(11), 912;

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

2,3,* and 1,3,*
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
School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
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
Received: 2 October 2016 / Revised: 4 November 2016 / Accepted: 7 November 2016 / Published: 10 November 2016
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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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