High electrochemical cycling performance through accurately inheriting hierarchical porous structure from bagasse
Date
2019
Authors
Luan, R.
Xu, D.
Pan, H.
Zhu, C.
Wang, D.
Meng, X.
Li, Y.
Imtiaz, M.
Zhu, S.
Ma, J.
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Journal article
Citation
Journal of Energy Storage, 2019; 22:60-67
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Abstract
Nature provides perfect varying models of hierarchical porous structures, but it remains a great challenge to accurately transfer these models intact to laboratory through carbonization during processing. In this study we report a new class of carbon materials whose hierarchical porous structure is accurately inherited from bagasse through a process consisting of a hydrothermal treatment with thiourea at 180 °C and then carbonization at 800 °C. The resulting composite structure consists of nanopores, supermicropores and ultramicropores with a high specific surface area of 2419 m 2 g −1 . The treatment with thiourea not only results in N and S doping but creates many papillae of a few hundreds of nanometer in diameter on the tubular wall. As a supercapacitor electrode working at 1 A g −1 in aqueous electrolyte, it shows a capacitance of 312 F g −1 (125 F cm −3 ), with 69% retention even at a very high current density of 20 A g −1 . The material renders a good energy density of 11 Wh kg −1 at a power density of 125 W kg −1 and shows good cycling stability, 99.7% of initial capacitance remained after 10,000 charge/discharge cycles. As a lithium ion battery anode, it exhibited capacity of 621 mA h g -1 at 100 mA g -1 and the capacity remained at 310 mA h g -1 at 1000 mA g -1 .
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Data source: Supplementary data, https://doi.org/10.1016/j.est.2019.01.021