Abstract
As electrode materials for supercapacitors, biomass-derived activated carbons attract much attention owing to their natural abundance and low cost. In this work, porous activated carbons are facilely synthesized from cattail wool using Ni(NO3)2·6H2O and KOH as co-etching agents. Compared with the carbons singly etched with KOH, these CWAC-x materials with hierarchical pores have much higher specific surface areas and exhibit much better capacitive performance. As for CWAC-10, the specific surface area and total pore volume are as high as 1581 m2 g−1 and 0.992 cm3 g−1, respectively. For supercapacitor applications, CWAC-10 exhibits a high specific capacitance (314 F g−1 at 1.0 A g−1 in a three-electrode system), excellent cycling stability and high energy density (37.29 Wh kg−1 at a power density of 159.98 W kg−1 in a coin-type symmetric device). The enhanced electrochemical performance can be attributed to the unique structure and the existence of O and N elements.
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Acknowledgements
Financial supports from the National Natural Science Foundation of China (No. U1304203), the Natural Science Foundation of Henan Province (No. 162300410258), the Foundation of Henan Educational Committee (No. 16A150046), the College Science and Technology Innovation Team of Henan Province (No. 16IRTSTHN001), and 111 Project (B12015) are greatly acknowledged.
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Su, XL., Jiang, S., Zheng, GP. et al. High-performance supercapacitors based on porous activated carbons from cattail wool. J Mater Sci 53, 9191–9205 (2018). https://doi.org/10.1007/s10853-018-2208-5
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DOI: https://doi.org/10.1007/s10853-018-2208-5