Porous carbon for high-energy density symmetrical supercapacitor and lithium-ion hybrid electrochemical capacitors

[Display omitted] •Porous carbon (PC-SE) was prepared by silkworm excrement as raw materials.•This PC-SE was featured with high specific surface area and 3D porous structure.•The symmetrical supercapacitor displayed an energy density of 138.4 Wh kg−1.•The Li-HEC applying PC-SE exhibited high energy...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-11, Vol.375, p.122020, Article 122020
Hauptverfasser: Wang, Ping, Zhang, Geng, Li, Meng-Yu, Yin, Ya-Xia, Li, Jin-Yi, Li, Ge, Wang, Wen-Peng, Peng, Wen, Cao, Fei-Fei, Guo, Yu-Guo
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Sprache:eng
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Zusammenfassung:[Display omitted] •Porous carbon (PC-SE) was prepared by silkworm excrement as raw materials.•This PC-SE was featured with high specific surface area and 3D porous structure.•The symmetrical supercapacitor displayed an energy density of 138.4 Wh kg−1.•The Li-HEC applying PC-SE exhibited high energy density (242.2 Wh kg−1). The design of carbon material with high capacitance and stability is one of the key issues in the development of supercapacitor and lithium-ion hybrid electrochemical capacitor (Li-HEC). Herein, porous carbon material with high specific surface area, honeycomb-like structure and hierarchical pore distribution ranging from macropore to micropore, was prepared from silkworm excrement by utilizing its highly porous and three-dimensional open structure. Moreover, the porous carbon is self-doped by nitrogen, which is beneficial to increase its pseudocapacitance and wettability to the electrolyte. The symmetrical supercapacitor and Li-HEC made by as-prepared porous carbon exhibited high energy density (138.4 Wh kg−1 for supercapacitor and 242.2 Wh kg−1 for Li-HEC), excellent rate performance and stability. This study offers a facile and cost-effective strategy to prepare advanced carbon material which can be applied in energy storage devices.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2019.122020