Abstract
In this work, the micromolecule l-glutamic acid (Glu) is employed as nitrogen-rich precursor to prepare a novel porous carbon, and ZnCl2 is used as activating agent to improve the surface area and electrochemical performance of the carbon. The nitrogen content of the carbon (Glu-2.5) prepared by Glu and ZnCl2 with a mass ratio of 1:2.5 retains as high as 7.1 % at an activation temperature of 700 °C. The surface area and pore volume of Glu-2.5 are 1007.4 m2 g−1 and 0.57 cm3 g−1, respectively. Glu-2.5 exhibits a high specific capacitance of 330.6 F g−1 in 2 M KOH electrolyte at the current density of 1 A g−1and good cycling stability (89 % retention of capacitance after 5000 charge/discharge cycles). More importantly, the assembled symmetric supercapacitor using Glu-2.5 as electrodes reveals a high energy density (16.7 Wh kg−1) under the power density of 404.7 W kg−1. Owing to its inherent advantages, Glu-2.5 could be a promising and scalable alternative applied to energy storage/conversion.
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Acknowledgments
This research was financially supported by the National Science Foundation of China (nos. 21164009 and 21174114), IRT1177 (IRT1177), the Science and Technology Program of Gansu Province (nos. 1308RJZA295 and 1308RJZA265), Key Laboratory of Eco-Environment-Related Polymer Materials (Northwest Normal University) of Ministry of Education, and Key Laboratory of Polymer Materials of Gansu Province.
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Ma, G., Zhang, Z., Peng, H. et al. Facile preparation of nitrogen-doped porous carbon for high performance symmetric supercapacitor. J Solid State Electrochem 20, 1613–1623 (2016). https://doi.org/10.1007/s10008-016-3171-1
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DOI: https://doi.org/10.1007/s10008-016-3171-1