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Issue 15, 2018
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Hierarchical porous carbon obtained from frozen tofu for efficient energy storage

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Abstract

Frozen tofu, as a carbon and nitrogen source, is converted to N (0.6–6.7 at%) and O (3.6–9.5 at%) co-doped porous carbon with a specific surface area of up to 3134 m2 g−1 by one-step carbonization-activation. This hierarchical carbon consists of a high volume of mesopores (1.11 cm3 g−1) and micropores (0.71 cm3 g−1) with a typical pore size distribution between 0.8 and 4 nm. Supercapacitors with the obtained carbon as electrodes exhibit a specific capacitance of 243 F g−1 (measured at 0.1 A g−1) in 1 M sulfuric acid (H2SO4) aqueous electrolyte with a capacitance retention of 93% after 10 000 cycles at 10 A g−1. The carbon also exhibits a specific capacitance of 170 F g−1 (measured at 1 A g−1) with a good rate capability (135 F g−1 at 20 A g−1) in 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid electrolyte, providing an energy density of 72 W h kg−1 (at an average power density of 889 W kg−1). A supercapacitor fabricated from the carbon in the ionic liquid electrolyte can readily power 25 light-emitting diodes in parallel for more than 2 min after being charged for 25 s at a current density of 10 A g-1. In addition, as an anode for Li-ion batteries, the porous carbon exhibits a high reversible charge capacity of 2120 mA h g−1 in the first cycle (measured at 0.1 A g−1) or 1035 mA h g−1 after 300 cycles (measured at 1 A g−1).

Graphical abstract: Hierarchical porous carbon obtained from frozen tofu for efficient energy storage

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Publication details

The article was received on 13 Apr 2018, accepted on 31 May 2018 and first published on 01 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ01788C
Citation: New J. Chem., 2018,42, 12421-12428
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    Hierarchical porous carbon obtained from frozen tofu for efficient energy storage

    X. Sun, J. Ye, F. Pan, J. Xu, T. Cheng, X. Wang, M. Ikram and Y. Zhu, New J. Chem., 2018, 42, 12421
    DOI: 10.1039/C8NJ01788C

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