Journal
FUEL PROCESSING TECHNOLOGY
Volume 142, Issue -, Pages 1-5Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2015.09.025
Keywords
Humic acid; KOH activation; Hierarchical porous carbons; Oxygen content; Volumetric capacitance
Funding
- National Natural Science Foundation of China [U1361119, 51404098, 51174077]
- Foundation of Henan Polytechnic University [B2014-008]
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Hierarchical porous carbons (HPCs) were prepared from coal-derived humic acid (HA) through a facile KOH activation method and used as electrode materials for supercapacitors. The obtained HPCs possess hierarchical porous structure consisting of micropores less than 1.8 nm, mesopores mainly falling in the narrow range of 3.5-4.5 nm and macropores, together with high oxygen content (>24.0 wt.%). And the HPC based electrodes deliver high volumetric capacitances with a maximum value of 201 F cm(-3) at a current density of 5 A g(-1), as well as high rate capabilities and excellent cycling stabilities. (C) 2015 Elsevier B.V. All rights reserved.
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