K. Wang, Z. Gu, Q. Fan
south dakota state university,
Keywords: biomass, activation, porous carbon, supercapacitor
Summary:This work shows that N-doped carbon can be derived from pyrrole modified biomass-lignin. Simultaneous chemical and physical activation using potassium hydroxide during the heat treatment can effectively create porous N-doped carbon. The activated carbon possesses cheese-like morphology with large specific surface area of 2661 m2 g-1 and mesopores of ~15 nm. Benefited from these characteristics, EDLCs prepared using the N-doped porous activated carbon show high specific capacitance of 248 F g-1 at low current density of 0.1 A g-1 and 211 F g-1 at high current density of 10 A g-1 in 6 M KOH solution. The EDLCs also exhibit excellent cycle stability for continuous 1,000 cycles at different current densities. This work indicates that the pyrrol-modified KOH-activated lignin is a promising electrode material for EDLCs.