Oxygen/phosphorus co-doped porous carbon from cicada slough as high-performance electrode material for supercapacitors

摘要

Synthesizing high-performance electrode materials plays a vital role in fabricating advanced supercapacitors. Heteroatom doping has been proved to be effective in enhancing the electrochemical properties of carbon-based electrodes. Herein, we report an O, P co-doped porous carbon (PC) originated from waste biomaterials, cicada sloughs. The PC possesses meso-/microporous structure with a large specific surface area (1945?m2·g?1) and a high O, P co-doping ratio of 18 wt.%. These superior factors together enable it to deliver high specific capacitance (295?F·g?1 in 6?M KOH and 291?F·g?1 in 1?M H2SO4), good cycling stability (100% capacitance retention after 10000 cycles in 1?M H2SO4) and rate performance. Therefore, from the respects of environment friendliness and cost effectivity, obtaining heteroatom doped carbons from the nature might be better compared to pyrolyzing heteroatom-containing chemicals.