Authors: Baolin Xing Guangxu Huang Zhengfei Chen Lunjian Chen Guiyun Yi Chuanxiang Zhang
Publish Date: 2016/08/24
Volume: 21, Issue: 1, Pages: 263-271
Abstract
A simple costeffective and environmentally friendly strategy for the preparation of porous carbons for supercapacitors via direct carbonization of potassium humate is presented The porous carbons obtained from leonardite potassium humate denoted as LPC and biotechnology potassium humate denoted as BPC showed macromesomicro hierarchical porous structure moderate surface area 668 m2 g−1 for LPC and 604 m2 g−1 for BPC and were enriched in oxygencontaining functional groups on the surface These porous carbons applied as electrode materials for supercapacitors exhibited an excellent capacitive behavior in basic acid and neutral aqueous electrolytes The respective specific capacitances for LPC and BPC were 223 and 200 F g−1 at current density of 50 mA g−1 and 175 and 151 F g−1 at current density of 25 A g−1 in a 3 M KOH electrolyte Moreover the porous carbons had high area specific capacitance up to 334 μF cm−2 superior cycling performance and low resistance This work demonstrates a promising preparation route for largescale production of hierarchical porous carbons for highperformance supercapacitorsThe authors gratefully acknowledge the financial support of the National Natural Science Foundation of China 51404098 U1361119 51174077 the International Science and Technology Cooperation Project of Henan province 152102410047 and program for Innovative Research Team in Science and Technology in the University of Henan Province 16IRTSTHN005
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