Porous carbon for high-energy density symmetrical supercapacitor and lithium-ion hybrid electrochemical capacitors
CHEMICAL ENGINEERING JOURNAL(2019)
摘要
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.
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关键词
Porous carbon,Supercapacitor,Lithium-ion hybrid electrochemical capacitor,High energy density
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