Abstract
In this paper, cabbage leaves (CLs) were used to synthesize porous activated carbon by the carbonization and activation processes. The material for CLs were carbonized at 600 °C and activated at 800 °C with the KOH/C-600 mass ratio 4 (denoted as AC-800) show typical amorphous character and display porous structures with high specific surface areas 3102 m2/g via XRD and BET measurements. As the electro-active material, AC-800 electrode exhibit ideal capacitive behaviors in aqueous electrolytes and the maximal specific capacitance is as high as 336 F/g at the current density of 1 A/g. Furthermore, AC-800 electrode shows excellent electrochemical cycle stability with ∼95 % initial capacitance being retained after 2000 cycles. The desirable capacitive performances enable the CLs to act as a new biomass source of carbonaceous materials for high-performance supercapacitors and low-cost electrical energy storage devices.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51462031), the Fundamental Research Funds for the Central Universities (Grant No. 31920150010), the National Natural Science Foundation of Gansu Province (Grant Nos. 145RJZA218 and 1308RJZA129), and Gansu Provincial Department of education project (Grant No. 2014B-008). This work was also supported by the Introduction of Talent project of Northwest University for Nationality (Grant No. xbmuyjrc201307).
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Wang, P., Wang, Q., Zhang, G. et al. Promising activated carbons derived from cabbage leaves and their application in high-performance supercapacitors electrodes. J Solid State Electrochem 20, 319–325 (2016). https://doi.org/10.1007/s10008-015-3042-1
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DOI: https://doi.org/10.1007/s10008-015-3042-1