Abstract
The cost-effective activated carbon based from waste cotton stalks by the KOH activation method is investigated as the electrode material in supercapacitor for the first time. Activation temperature control is one of the most important factors affecting the surface area and pore structure of activated carbon, and it influences the capacitive performance of activated carbon based from cotton stalk. The optimized conditions are as follows: cotton stalk base charcoals and activating agent with a mass ration of 1:4, at an activation temperature of 600, 700, and 800°C for 1, 1, and 2 h, respectively. With these experimental conditions, the activated carbon presents excellent electrochemical characteristics. The specific capacitance of the prepared activated carbon was as high as 180 F g−1at 2 A g−1 in 1.0 mol·L−1 Et4NBF4/AN electrolyte and the specific capacitance without obvious attenuation after 2000 cycles. So, it is reasonable to believe that the activated carbons from cotton stalks by the KOH gradient constant temperature activation method might be one of the innovative carbon electrode materials for supercapacitor.
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Acknowledgments
The authors are grateful for support from Advanced Carbon Materials Research Laboratory, College of Materials Science and Engineering, Beijing University of Chemical Technology.
This work was supported by the Xinjiang science and technology aid project in Xinjiang (No.2013911049), Industrial Science and technology project of Shaanxi Province (NO.2016GY-170), the “West Light” Talents Cultivation Program of the Chinese Academy of Sciences (No.XBBS200919), and the Foundation of State Key Laboratory of Chemical Resource Engineering (BUCT).
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Li, W., Wumaier, T., Chen, M. et al. Effect of the gradient constant temperature on the electrochemical capacitance of cotton stalk-based activated carbon. J Solid State Electrochem 20, 2315–2321 (2016). https://doi.org/10.1007/s10008-016-3235-2
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DOI: https://doi.org/10.1007/s10008-016-3235-2