Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 12, Issue 6, Pages 5604-5617Publisher
ESG
DOI: 10.20964/2017.06.16
Keywords
Biomass; Carbon microspheres; Hierarchical pore; Supercapacitors
Categories
Funding
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCQNJC05700, 15JCQNJC05300, 14JCYBJC17500]
- National Natural Science Foundation of China [21303119]
- National Students' Platform for Innovation and Entrepreneurship Training Program [201510058020]
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University [2017-31]
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The hierarchical porous carbon microspheres (HPCS) were obtained using corncob as precursor via a facile and cost-effective approach. The porous carbon microspheres exhibited regular spherical morphology, hierarchical porous, localized graphitization structure and the oxygen-containing functional groups on the surface of carbon spheres. The pore size and specific surface area could be tuned by the amount of KOH during the activation process. The porous carbon microspheres displayed maximum specific capacitance of 384.5 F/g at scan rate of 5 mV/s and ultra-high rate capacitance of 137.3 F/g at the current density of 100 A/g. The high capacitance retention of the porous carbon microspheres (over 97%, even with 5000 charge/discharge cycles) demonstrated its superior cycling stability. Moreover, high power density (62.9 kW/kg) and energy density (33.4 Wh/kg) could be achieved at 120 A/g. Hence, the ultrahigh specific capacitance and exceptional cyclic stability of the porous carbon microspheres indicate its significant potential application in the field of energy storage.
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