Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6472348 | Electrochimica Acta | 2016 | 9 Pages |
In general, carbon materials with high specific surface area (SSA), well-balanced pore size distributions, and appropriate content of heteroatom functionalities are essential to enhance the performance of electric double layer capacitors (EDLCs) for capacitive energy storage. In this study, a low-cost biological waste-stiff silkworm was first used as precursor for the synthesis of well-developed microporous carbon (SSMC) material by simple steps of carbonization and further activation. The SSMC was endowed with ultra-high SSA (2523 m2 gâ1), large pore volume (1.37 m3 gâ1), and high content of heteroatom functionalities (â¼3.5 at% N and â¼5.1 at% O). EDLCs employed SSMC as active material showed high specific capacitance of 304 F gâ1 and 256 F gâ1 at current densities of 1 A gâ1 and 20 A gâ1, respectively, suggesting the good rate capability. Symmetric-two-electrode test in aqueous electrolyte also delivered the specific capacitance of 235 F gâ1 with the energy density of â¼7.9 W h kgâ1. The findings confirmed the feasible way that using the eco-friendly biomass raw material to construct high performance capacitive energy storage device.