Biomass-derived multi-heteroatom-doped carbon materials for high-performance solid-state symmetric supercapacitors with superior long-term cycling stability

摘要: In order to fabricate high-performance supercapacitors with desirable energy density and excellent cycling stability, this work aimed synthesize biomass-derived carbon materials great electrochemical performance, especially superior long-term via a facile simple process. Herein, we have fabricated three kinds of multi-heteroatom-doped materials, using laver, soybean milk (Ag+) as the precursors, labeled LC, SC Ag-SC, respectively. The heteroatom-doped possessed extremely high performance; after for 50,000 times, specific capacitances LC could maintain 119.8% 96.0%, capacitance Ag-SC 131.1% 40,000 times. Additionally, densities corresponding solid-state symmetric were 9.5, 6.2 6.9 Wh kg−1 at power about 900 W kg−1, respectively, retain 141.5%, 128.9% 102.2% 50,000 cycles.