Porous carbons produced by the pyrolysis of green onion leaves and their capacitive behavior

YU Jing; GAO Li-zhen; LI Xue-lian; WU Chao; GAO Li-li; LI Chang-ming

doi:10.1016/S1872-5805(16)60026-4

Volume 31 Issue 5

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YU Jing, GAO Li-zhen, LI Xue-lian, WU Chao, GAO Li-li, LI Chang-ming. Porous carbons produced by the pyrolysis of green onion leaves and their capacitive behavior. New Carbon Mater., 2016, 31(5): 475-484. doi: 10.1016/S1872-5805(16)60026-4

Citation:

YU Jing, GAO Li-zhen, LI Xue-lian, WU Chao, GAO Li-li, LI Chang-ming. Porous carbons produced by the pyrolysis of green onion leaves and their capacitive behavior. New Carbon Mater., 2016, 31(5): 475-484. doi: 10.1016/S1872-5805(16)60026-4

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Porous carbons produced by the pyrolysis of green onion leaves and their capacitive behavior

doi: 10.1016/S1872-5805(16)60026-4

1.
School of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.
Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing 400715, China;
3.
Lab of green energy materials and storage systems, Taiyuan University of Technology, Taiyuan 030024, China

Funds: Shanxi Province Science Foundation for Youths (2013021011-3); Shanxi Scholarship Council of China (2013-041); Project for Importing Talent of Taiyuan University of Technology(tyut-rc201110a).

Received Date: 2016-06-10
Accepted Date: 2016-10-28
Rev Recd Date: 2016-07-28
Publish Date: 2016-10-28

Abstract

Abstract

Porous carbons were prepared by the simple carbonization of green onion leaves at temperatures from 600 to 800℃ and used as the electrode materials of supercapacitors. SEM, FESEM, EDX, AAS, XRD, TGA and nitrogen adsorption were used to characterize their morphology, pore structure and surface elemental composition. Cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge were carried out to evaluate their specific capacitance, resistance and cycling life. Results showed that the initial mineral elements present in the leaves such as calcium (Ca) and potassium (K) play an activating role during the carbonization. All samples have a bimodal pore distribution of micropores (mainly 0.6-1.2 nm) and mesopores (mainly 3-5 nm). The carbon prepared at 800℃ had the highest surface area of 551.7 m²/g, a specific capacitance of 158.6 F/g at 0.2 A/g and an effective areal capacitance of 28.8 μF/cm². The effective areal capacitance of the carbon prepared at 800℃ is higher than of most porous carbons reported in the literature, which is ascribed to its pore size distribution that favors ion access to its pores.
- Porous carbon,
- Green onion leaves,
- One-step carbonization and activation,
- Effective areal capacitance

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