Journal
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
Volume 42, Issue 14, Pages 1797-1807Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15567036.2019.1604890
Keywords
Co-pyrolysis; natural N dopant; supercapacitors; rice husk; bean dregs
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Porous N-doped carbons were successfully synthesized via a facile and eco-friendly nitrogen-doping route without N-containing chemical dopants, where bean dregs natural N dopant instead of hazardous chemical reagents. Through co-pyrolysis and activation of rice husk and bean dregs at different mass ratios of RH and BD (1:0, 2:1, 1:1, 1:2, 1:0), a series of carbon materials were fabricated. The physicochemical properties and capacitive performance of carbon were investigated. RBAC-3 displayed superior capacitive performance. The capacitance reached 319 F g(-1) at 0.2 A g(-1) using two-electrode system. The capacitance retention is as high as 92.6% after 10,000 cycles. The corresponding energy density reached 15.3 Wh kg(-1), increased by 37% in comparison of pure rice husk-based electrode in 6 M KOH electrolyte. That result was ascribed to the best synergistic effects of hierarchical porous structure and particular nitrogen content, suggesting a promising electrode fabrication for high-performance supercapacitors.
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