期刊
JOURNAL OF POWER SOURCES
卷 361, 期 -, 页码 249-258出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.06.086
关键词
Waste sugar solution; Porous carbon spheres; Electric double-layer capacitor; Electrochemical performance
资金
- Fundamental Research Funds for the Central Universities (China University of Mining and Technology) [2015QNA23]
- National Natural Science Foundation of China [21676292]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Waste sugar solution (WSS), which contains abundant 2-keto-L-gulonic acid, is harmful to the environment if discharged directly. For value-added utilization of the waste resource, a novel process is developed for preparation of porous carbon spheres by hydrothermal carbonization (HTC) of WSS followed by KOH activation. Additionally, the possible preparation mechanism of carbon spheres is proposed. The effects of hydrothermal and activation parameters on the properties of the carbon sphere are also investigated. The carbon sphere is applied to electric double-layer capacitor and its electrochemical performance is studied. These results show that the carbon sphere obtained by HTC at 180 degrees C for 12 h with the WSS/deionized water volume ratio of 2/3 possess the highest specific capacitance under identical activation conditions. The specific capacitance of the carbon spheres can reach 296.1 F g(-1) at a current density of 40 mA g(-1). Besides, excellent cycle life and good capacitance retention (89.6%) are observed at 1.5 A g(-1) after 5000 cycles. This study not only provides a facile and potential method for the WSS treatment, but also achieves the high value-added recycling of WSS for the preparation of porous carbon spheres with superior electrochemical properties. (C) 2017 Elsevier B.V. All rights reserved.
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