Abstract
Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different temperatures (600, 700 and 800 °C) using potassium hydroxide (KOH) pellets as an activation agent with different mass loading. The physicochemical and microstructural characteristics of the as-obtained material revealed interconnected microporous/mesoporous architecture with increasing trend in specific surface area (SSA) as carbonization temperatures rises. The SSA values of up to 1018 m2 g−1 and a high pore volume of 0.67 cm3 g−1 were obtained. The potential of the ACB material as suitable supercapacitor electrode was investigated in both a three and two-electrode configuration in different neutral aqueous electrolytes. The electrodes exhibited electric double-layer capacitor (EDLC) behaviour in all electrolytes with the Na2SO4 electrolyte working reversibly in both the negative (−0.80 V to −0.20 V) and positive (0.0 V to 0.6 V) operating potentials. A specific capacitance (C
s
) of up to 191 F g−1 at a current density of 1 A g−1 was obtained for the optimized ACB electrode material in 1 M Na2SO4 electrolyte. A symmetric device fabricated exhibited specific C
s
of 114 F g−1 at 0.3 A g−1 and excellent stability with a coulombic efficiency of a 100 % after 5000 constant charge–discharge cycles at 5.0 A g−1 and a low capacitance loss for a floating time of 70 h.
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Acknowledgments
The authors would like to specially thank Isbe VanDerWesthuizen for the results obtained from the TGA analysis. This work is based on the research supported by the South African Research Chairs Initiative of the Department of Science and Technology, Republic of South Africa and National Research Foundation of South Africa (Grant no. 97994). Any opinion, finding and conclusion or recommendation expressed in this material is that of the author(s) and the NRF does not accept any liability in this regard. D. Momodu and F. Barzegar would like to acknowledge financial support from the University of Pretoria for their post-doctoral study.
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Momodu, D., Madito, M., Barzegar, F. et al. Activated carbon derived from tree bark biomass with promising material properties for supercapacitors. J Solid State Electrochem 21, 859–872 (2017). https://doi.org/10.1007/s10008-016-3432-z
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DOI: https://doi.org/10.1007/s10008-016-3432-z