Journal
NANOMATERIALS
Volume 8, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano8060412
Keywords
nitrogen doping; hierarchical structure; porous carbon; three-dimensional architecture; cotton seed husk; supercapacitor; sustainable biomass
Categories
Funding
- National Natural Science Foundation of China [U1303291]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R46]
- Program of Science and Technology Innovation Team in Bingtuan [2015BD003]
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Hierarchical porous structures with surface nitrogen-doped porous carbon are current research topics of interest for high performance supercapacitor electrode materials. Herein, a three-dimensional (3D) honeycomb-like porous carbon with interconnected hierarchical porosity and nitrogen self-doping was synthesized by simple and cost-efficient one-step KOH activation from waste cottonseed husk (a-CSHs). The obtained a-CSHs possessed hierarchical micro-, meso-, and macro-pores, a high specific surface area of 1694.1 m(2)/g, 3D architecture, and abundant self N-doping. Owing to these distinct features, a-CSHs delivered high specific capacitances of 238 F/g and 200 F/g at current densities of 0.5 A/g and 20 A/g, respectively, in a 6 mol/L KOH electrolyte, demonstrating good capacitance retention of 84%. The assembled a-CSHs-based symmetric supercapacitor also displayed high specific capacitance of 52 F/g at 0.5 A/g, with an energy density of 10.4 Wh/Kg at 300 W/Kg, and 91% capacitance retention after 5000 cycles at 10 A/g.
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